<PAGE>

                                                                    Exhibit 4.02

================================================================================

                         REGISTRATION RIGHTS AGREEMENT

                           Dated as of April 30, 1999

                                     Among

                       BUILDING ONE SERVICES CORPORATION

                                      and

                          THE GUARANTORS NAMED HEREIN,

                                  as Issuers,

                                      and

                      THE INITIAL PURCHASERS NAMED HEREIN,

                   10-1/2% Senior Subordinated Notes due 2009

================================================================================
<PAGE>

                         REGISTRATION RIGHTS AGREEMENT
                         -----------------------------

          This Registration Rights Agreement (this "Agreement") is dated as of
                                                    ---------
April 30, 1999, among BUILDING ONE SERVICES CORPORATION, a Delaware corporation
(the "Company"), as issuer, and the other entities listed on the signature page
      -------
hereto, as guarantors (the "Guarantors" and, together with the Company, the
                            ----------
"Issuers"), and BT Alex. Brown Incorporated, Bear, Stearns & Co. Inc., Goldman,
--------
Sachs & Co., Salomon Smith Barney Inc., Friedman, Billings, Ramsey & Co. Inc.,
Jefferies & Company, Inc. and Fleet Securities, Inc., as initial purchasers (the
"Initial Purchasers").
 ------------------

          This Agreement is entered into in connection with the Purchase
Agreement, dated as of April 23, 1999, among the Issuers and the Initial
Purchasers (the "Purchase Agreement"), which provides for, among other things,
                 ------------------
the sale by the Company to the Initial Purchasers of $200,000,000 aggregate
principal amount of the Company's  10-1/2% Senior Subordinated Notes due 2009
(the "Notes"), guaranteed by the Guarantors (the "Guarantees").  The Notes and
      -----                                       ----------
the Guarantees are collectively referred to herein as the "Securities".  In
                                                           ----------
order to induce the Initial Purchasers to enter into the Purchase Agreement, the
Issuers have agreed to provide the registration rights set forth in this
Agreement for the benefit of the Initial Purchasers and any subsequent holder or
holders of the Securities.  The execution and delivery of this Agreement is a
condition to the Initial Purchasers' obligation to purchase the Securities under
the Purchase Agreement.

          The parties hereby agree as follows:

     1.   Definitions
          -----------

          As used in this Agreement, the following terms shall have the
following meanings:

          Additional Interest:  See Section 4 hereof.
          -------------------

          Advice:  See the last paragraph of Section 5 hereof.
          ------

          Applicable Period:  See Section 2 hereof.
          -----------------

          Company:  See the introductory paragraphs hereto.
          -------

          Effectiveness Date:  The 150th day after the Issue Date; provided,
          ------------------                                       --------
however, that with respect to any Shelf Registration, the Effectiveness Date
-------
shall be the later of the 60th day after the date the Shelf Registration was
filed or the 150th day after the Issue Date.

          Effectiveness Period:  See Section 3 hereof.
          --------------------
<PAGE>

                                      -2-

          Event Date:  See Section 4 hereof.
          ----------

          Exchange Act:  The Securities Exchange Act of 1934, as amended, and
          ------------
the rules and regulations of the SEC promulgated thereunder.

          Exchange Notes:  See Section 2 hereof.
          --------------

          Exchange Offer:  See Section 2 hereof.
          --------------

          Exchange Offer Registration Statement:  See Section 2 hereof.
          -------------------------------------

          Filing Date:  (A) If an Exchange Offer Registration Statement is filed
          -----------
or a Shelf Registration Statement is filed in lieu of an Exchange Offer
Registration Statement by the Issuers pursuant to this Agreement, the 60th day
after the Issue Date; and (B) with respect to a Shelf Registration Statement,
the 60th day after the delivery of a Shelf Notice as required pursuant to
Section 2(c) hereof.

          Guarantees:  See the introductory paragraphs hereto.
          ----------

          Guarantors:  See the introductory paragraphs hereto.
          ----------

          Holder:  Any record holder of a Registrable Note or Registrable Notes.
          ------

          Indemnified Person:  See Section 7(c) hereof.
          ------------------

          Indemnifying Person:  See Section 7(c) hereof.
          -------------------

          Indenture:  The Indenture, dated as of April 30, 1999, by and among
          ---------
the Issuers and IBJ Whitehall Bank & Trust Company, as trustee, pursuant to
which the Securities are being issued, as the same may be amended or
supplemented from time to time in accordance with the terms thereof.

          Initial Purchasers:  See the introductory paragraphs hereto.
          ------------------

          Initial Shelf Registration:  See Section 3(a) hereof.
          --------------------------

          Inspectors:  See Section 5(m) hereof.
          ----------

          Issue Date:  April 30, 1999, the date of original issuance of the
          ----------
Notes.

          Issuers:  See the introductory paragraphs hereto.
          -------

          NASD:  See Section 5(r) hereof.
          ----
<PAGE>

                                      -3-

          Notes:  See the introductory paragraphs hereto.
          -----

          Offering Memorandum:  The final offering memorandum of the Company
          -------------------
dated April 23, 1999, in respect of the offering of the Securities.

          Participant:  See Section 7(a) hereof.
          -----------

          Participating Broker-Dealer:  See Section 2 hereof.
          ---------------------------

          Person:  An individual, trustee, corporation, partnership, limited
          ------
liability company, joint stock company, trust, unincorporated association,
union, business association, firm or other legal entity.

          Private Exchange:  See Section 2 hereof.
          ----------------

          Private Exchange Notes:  See Section 2 hereof.
          ----------------------

          Prospectus:  The prospectus included in any Registration Statement
          ----------
(including, without limitation, any prospectus subject to completion and a
prospectus that includes any information previously omitted from a prospectus
filed as part of an effective registration statement in reliance upon Rule 430A
promulgated under the Securities Act and any term sheet filed pursuant to Rule
434 under the Securities Act), as amended or supplemented by any prospectus
supplement, and all other amendments and supplements to the Prospectus,
including post-effective amendments, and all material incorporated by reference
or deemed to be incorporated by reference in such Prospectus.

          Purchase Agreement:  See the introductory paragraphs hereof.
          ------------------

          Records:  See Section 5(m) hereof.
          -------

          Registrable Notes:  Each Note upon original issuance (and the related
          -----------------
Guarantee) and, at all times subsequent thereto, each Exchange Note (and the
related Guarantee) as to which Section 2(c)(iv) hereof is applicable upon
original issuance and at all times subsequent thereto and each Private Exchange
Note (and the related Guarantee) upon original issuance thereof and at all times
subsequent thereto, until (i) a Registration Statement (other than, with respect
only to any Exchange Note as to which Section 2(c)(iv) hereof is applicable, the
Exchange Offer Registration Statement) covering such Security, Exchange Note or
Private Exchange Note has been declared effective by the SEC and such Security,
Exchange Note or such Private Exchange Note (and the related Guarantees), as the
case may be, has been disposed of in accordance with such effective Registration
Statement, (ii) such Security has been exchanged pursuant to the Exchange Offer
for an Exchange Note or Exchange Notes (and the related Guarantees) and Section
2(c)(iv) is not applicable thereto, (iii) such Security, Exchange Note or
Private Exchange Note (and the related Guarantees), as the case may be,
<PAGE>

                                      -4-

ceases to be outstanding for purposes of the Indenture or (iv) such Security,
Exchange Note or Private Exchange Note (and the related Guarantees), as the case
may be, has been sold, or may be resold without restriction, pursuant to Rule
144 (or any similar provision then in force) under the Securities Act.

          Registration Statement:  Any registration statement of the Issuers
          ----------------------
that covers any of the Notes, the Exchange Notes or the Private Exchange Notes
(and the related Guarantees) filed with the SEC under the Securities Act,
including the Prospectus, amendments and supplements to such registration
statement, including post-effective amendments, all exhibits, and all material
incorporated by reference or deemed to be incorporated by reference in such
registration statement.

          Rule 144:  Rule 144 promulgated under the Securities Act, as such Rule
          --------
may be amended from time to time, or any similar rule (other than Rule 144A) or
regulation hereafter adopted by the SEC providing for offers and sales of
securities made in compliance therewith resulting in offers and sales by
subsequent holders that are not affiliates of the issuer of such securities
being free of the registration and prospectus delivery requirements of the
Securities Act.

          Rule 144A:  Rule 144A promulgated under the Securities Act, as such
          ---------
Rule may be amended from time to time, or any similar rule (other than Rule 144)
or regulation hereafter adopted by the SEC.

          Rule 415:  Rule 415 promulgated under the Securities Act, as such Rule
          --------
may be amended from time to time, or any similar rule or regulation hereafter
adopted by the SEC.

          SEC:  The Securities and Exchange Commission.
          ---

          Securities:  See the introductory paragraphs hereto.
          ----------

          Securities Act:  The Securities Act of 1933, as amended, and the rules
          --------------
and regulations of the SEC promulgated thereunder.

          Shelf Notice:  See Section 2 hereof.
          ------------

          Shelf Registration:  See Section 3(b) hereof.
          ------------------

          Subsequent Shelf Registration:  See Section 3(b) hereof.
          -----------------------------

          Suspension Period:  See Section 3(d) hereof.
          -----------------

          TIA:  The Trust Indenture Act of 1939, as amended.
          ---
<PAGE>

                                      -5-

          Trustee:  The trustee under the Indenture and the trustee (if any)
          -------
under any indenture governing the Exchange Notes and Private Exchange Notes (and
the related Guarantees).

          underwritten registration or underwritten offering:  A registration in
          --------------------------------------------------
which securities of one or more of the Issuers are sold to an underwriter for
reoffering to the public.

     2.  Exchange Offer
         --------------

          (a) To the extent not prohibited by any applicable law or applicable
interpretation of the staff of the SEC, the Issuers shall file with the SEC, no
later than the Filing Date, a Registration Statement (the "Exchange Offer
                                                           --------------
Registration Statement") on an appropriate registration form with respect to a
----------------------
registered offer (the "Exchange Offer") to exchange any and all of the
                       --------------
Registrable Notes for a like aggregate principal amount of notes of the Company,
guaranteed by the Guarantors, that are identical in all material respects to the
Securities (the "Exchange Notes"), except that (i) the Exchange Notes shall
                 --------------
contain no restrictive legend thereon and (ii) interest thereon shall accrue
from the last date on which interest was paid on the Notes or, if no such
interest has been paid, from the Issue Date, and which are entitled to the
benefits of the Indenture or a trust indenture which is identical in all
material respects to the Indenture (other than such changes to the Indenture or
any such identical trust indenture as are necessary to comply with the TIA) and
which, in either case, has been qualified under the TIA.  The Exchange Offer
shall comply with all applicable tender offer rules and regulations under the
Exchange Act and other applicable law.  The Issuers shall use their commercially
reasonable best efforts to (x) cause the Exchange Offer Registration Statement
to be declared effective under the Securities Act on or before the Effectiveness
Date; (y) keep the Exchange Offer open for at least 30 days (or longer if
required by applicable law) after the date that notice of the Exchange Offer is
mailed to Holders; and (z) consummate the Exchange Offer on or prior to the
195th day after the Issue Date.  If, after the Exchange Offer Registration
Statement is initially declared effective by the SEC, the Exchange Offer or the
issuance of the Exchange Notes thereunder is interfered with by any stop order,
injunction or other order or requirement of the SEC or any other governmental
agency or court, the Exchange Offer Registration Statement shall be deemed not
to have become effective for purposes of this Agreement during the period of
such interference, until the Exchange Offer may legally resume.

          Each Holder that participates in the Exchange Offer will be required,
as a condition to its participation in the Exchange Offer, to represent to the
Issuers in writing (which may be contained in the applicable letter of
transmittal) that:  (i) any Exchange Notes to be received by it will be acquired
in the ordinary course of its business, (ii) such Holder has no arrangement or
understanding with any Person to participate in the distribution of the Exchange
Notes in violation of the provisions of the Securities Act, (iii) such Holder is
not an affiliate of the Company within the meaning of the Securities Act or, if
such Holder is an affiliate, that it will comply with the registration and
prospectus delivery requirements of the
<PAGE>

Securities Act applicable to it, (iv) if such Holder is not a broker-dealer,
such Holder is not engaged in, and does not intend to engage in, the
distribution (within the meaning of the Securities Act) of Exchange Notes, (v)
if such Holder is a broker-dealer that will receive Exchange Notes for its own
account in exchange for Notes that were acquired as a result of market-making or
other trading activities, such Holder will deliver a prospectus in connection
with any resale of such Exchange Notes and (vi) the Holder is not acting on
behalf of any persons or entities who could not truthfully make the foregoing
representations. Such Holder will also be required to make such other
representations as may be necessary under applicable SEC rules, regulations or
interpretations to render available the use of Form S-4 or any other appropriate
form under the Securities Act.

          Upon consummation of the Exchange Offer in accordance with this
Section 2, the provisions of this Agreement shall continue to apply solely with
respect to Registrable Notes that are Private Exchange Notes, Exchange Notes as
to which Section 2(c)(iv) is applicable and Exchange Notes held by Participating
Broker-Dealers (as defined), and the Issuers shall have no further obligation to
register Registrable Notes (other than Private Exchange Notes and other than in
respect of any Exchange Notes as to which clause 2(c)(iv) hereof applies)
pursuant to Section 3 hereof.

          No securities other than the Exchange Notes shall be included in the
Exchange Offer Registration Statement.

          (b) To the extent required by applicable law or SEC policy, the
Issuers shall include within the Prospectus contained in the Exchange Offer
Registration Statement a section entitled "Plan of Distribution," reasonably
acceptable to the Initial Purchasers, which shall contain a summary statement of
the positions taken or policies made by the staff of the SEC (and publicly
disseminated) with respect to the potential "underwriter" status of any broker-
dealer that is the beneficial owner (as defined in Rule 13d-3 under the Exchange
Act) of Exchange Notes received by such broker-dealer in the Exchange Offer (a
"Participating Broker-Dealer") (other than any Notes acquired by it and having
 ---------------------------
the status of an unsold allotment in the initial distribution).  Such "Plan of
Distribution" section shall also expressly permit, to the extent permitted by
applicable policies and regulations of the SEC, the use of the Prospectus by all
Persons subject to the prospectus delivery requirements of the Securities Act,
including, to the extent permitted by applicable policies and regulations of the
SEC, all Participating Broker-Dealers, and include a statement describing the
means by which Participating Broker-Dealers may resell the Exchange Notes in
compliance with the Securities Act.

          The Issuers shall use their commercially reasonably best efforts to
keep the Exchange Offer Registration Statement effective and to amend and
supplement the Prospectus contained therein in order to permit such Prospectus
to be lawfully delivered by all Persons subject to the prospectus delivery
requirements of the Securities Act for such period of time as is necessary to
comply with applicable law in connection with any resale of the Exchange
<PAGE>

Notes covered thereby, provided, however, such period shall not be required to
exceed 150 days, or such longer period if extended pursuant to the last sentence
of Section 5 (the "Applicable Period").
                   -----------------

          If, prior to consummation of the Exchange Offer, the Initial
Purchasers hold any Notes acquired by them that have the status of an unsold
allotment in the initial distribution, the Issuers upon the request of the
Initial Purchasers shall simultaneously with the delivery of the Exchange Notes
in the Exchange Offer, issue and deliver to the Initial Purchasers, in exchange
(the "Private Exchange") for such Notes held by the Initial Purchasers, a like
      ----------------
principal amount of notes (the "Private Exchange Notes") of the Issuers,
                                ----------------------
guaranteed by the Guarantors, that are identical in all material respects to the
Exchange Notes except for the placement of a restrictive legend on such Private
Exchange Notes.  The Private Exchange Notes shall be issued pursuant to the same
indenture as the Exchange Notes and bear the same CUSIP number as the Exchange
Notes.

          In connection with the Exchange Offer, the Issuers shall:

          (1)   mail, or cause to be mailed, to each Holder of record entitled
     to participate in the Exchange Offer a copy of the Prospectus forming part
     of the Exchange Offer Registration Statement, together with an appropriate
     letter of transmittal and related documents;

          (2)   use their best efforts to keep the Exchange Offer open for not
     less than 30 days after the date that notice of the Exchange Offer is
     mailed to Holders (or longer if required by applicable law);

          (3)   utilize the services of a depositary for the Exchange Offer with
     an address in the Borough of Manhattan, The City of New York;

          (4)   permit Holders to withdraw tendered Securities at any time prior
     to the close of business, New York time, on the last business day on which
     the Exchange Offer shall remain open; and

          (5)   otherwise comply in all material respects with all applicable
     laws, rules and regulations.

          As soon as practicable after the close of the Exchange Offer and the
Private Exchange, if any, the Issuers shall:

          (1) accept for exchange all Registrable Notes validly tendered and not
     validly withdrawn pursuant to the Exchange Offer and the Private Exchange,
     if any;
<PAGE>

                                      -8-

          (2) deliver to the Trustee for cancellation all Registrable Notes so
     accepted for exchange; and

          (3) cause the Trustee to authenticate and deliver promptly to each
     Holder of Securities, Exchange Notes or Private Exchange Notes, as the case
     may be, equal in principal amount to the Securities of such Holder so
     accepted for exchange.

          The Exchange Offer and the Private Exchange shall not be subject to
any conditions, other than that (i) the Exchange Offer or the Private Exchange,
as the case may be, does not violate applicable law or any applicable
interpretation of the staff of the SEC, (ii) no action or proceeding shall have
been instituted or threatened in any court or by any governmental agency which
might materially impair the ability of the Issuers to proceed with the Exchange
Offer or the Private Exchange, (iii) all governmental approvals shall have been
obtained, which approvals the Issuers deem necessary for the consummation of the
Exchange Offer or the Private Exchange, (iv) there has not been any material
change, or development involving a prospective material change, in the business
or financial affairs of the Issuers which, in the reasonable judgment of the
Issuers, would materially impair the Issuers' ability to consummate the Exchange
Offer or the Private Exchange, and (v) there has not been proposed, adopted or
enacted any law, statute, rule or regulation which, in the reasonable judgment
of the Issuers, would materially impair the Issuers' ability to consummate the
Exchange Offer or the Private Exchange or have a material adverse effect on the
Issuers if the Exchange Offer or the Private Exchange was consummated.  In the
event that the Issuers are unable to consummate the Exchange Offer or the
Private Exchange due to any event listed in clauses (i) through (v) above, the
Issuers shall not be deemed to have breached any covenant under this Section 2.

          The Exchange Notes and the Private Exchange Notes shall be issued
under (i) the Indenture or (ii) an indenture identical in all material respects
to the Indenture and which, in either case, has been qualified under the TIA or
is exempt from such qualification and shall provide that the Exchange Notes
shall not be subject to the transfer restrictions set forth in the Indenture.
The Indenture or such indenture shall provide that the Exchange Notes, the
Private Exchange Notes and the Securities shall vote and consent together on all
matters as one class and that none of the Exchange Notes, the Private Exchange
Notes or the Securities will have the right to vote or consent as a separate
class on any matter.

          (c) If (i) because of any change in law or in currently prevailing
interpretations of the staff of the SEC, the Issuers determine in good faith
that they are not permitted to effect the Exchange Offer, (ii) the Exchange
Offer is not consummated within 195 days of the Issue Date, as extended pursuant
to this agreement, (iii) the holder of Private Exchange Notes so requests in
writing to the Issuers within 60 days after the consummation of the Exchange
Offer, or (iv), in the case of any Holder that participates in the Exchange
Offer, such Holder does not receive Exchange Notes on the date of the exchange
that may be sold without deliv-
<PAGE>

                                      -9-

ering a prospectus, and in the reasonable opinion of Issuers' Counsel the
Prospectus included in the Exchange Offer Registration Statement is not legally
available for such resales by such Holder, then in the case of each of clauses
(i) to and including (iv) of this sentence, the Issuers shall promptly deliver
to the Holders and the Trustee written notice thereof (the "Shelf Notice") and
                                                            ------------
shall file a Shelf Registration pursuant to Section 3 hereof.

     3.  Shelf Registration
         ------------------

          If at any time a Shelf Notice is delivered as contemplated by Section
2(c) hereof, then:

          (a) Shelf Registration.  The Issuers shall file with the SEC a
              ------------------
Registration Statement for an offering to be made on a continuous basis pursuant
to Rule 415 covering all of the Registrable Notes not exchanged in the Exchange
Offer, Private Exchange Notes and Exchange Notes as to which Section 2(c)(iv) is
applicable (the "Initial Shelf Registration").  The Issuers shall use their
                 --------------------------
commercially reasonable best efforts to file with the SEC the Initial Shelf
Registration on or before the applicable Filing Date.  The Initial Shelf
Registration shall be on Form S-1 or another appropriate form permitting
registration of such Registrable Notes for resale by Holders in the manner or
manners designated by them (including, without limitation, one underwritten
offering).  The Issuers shall not permit any securities other than the
Registrable Notes to be included in the Initial Shelf Registration or any
Subsequent Shelf Registration (as defined below).

          The Issuers shall, subject to applicable law or applicable
interpretations of the staff of the SEC, use their commercially reasonable best
efforts to cause the Initial Shelf Registration to be declared effective under
the Securities Act on or prior to the Effectiveness Date and to keep the Initial
Shelf Registration continuously effective under the Securities Act until the
date which is two years from the Issue Date or such shorter period ending when
(i) all Registrable Notes covered by the Initial Shelf Registration have been
sold in the manner set forth and as contemplated in the Initial Shelf
Registration or cease to be outstanding, (ii) a Subsequent Shelf Registration
covering all of the Registrable Notes covered by and not sold under the Initial
Shelf Registration or an earlier Subsequent Shelf Registration has been declared
effective under the Securities Act or (iii) all outstanding Registrable Notes
cease to be Registrable Notes (the "Effectiveness Period"), provided, however,
                                    --------------------    --------  -------
that the Effectiveness Period in respect of the Initial Shelf Registration shall
be extended to the extent required to permit dealers to comply with the
applicable prospectus delivery requirements of Rule 174 under the Securities Act
and as otherwise provided herein.

          No holder of Registrable Notes may include any of its Registrable
Notes in any Shelf Registration Statement pursuant to this Agreement unless and
until such holder furnishes to the Company in writing, within 15 business days
after receipt of a request therefor, such information concerning such Holder
required to be included in any Shelf Registration Statement or Prospectus or
preliminary prospectus included therein.  No holder of Registrable
<PAGE>

                                     -10-

Notes shall be entitled to Additional Interest pursuant to Section 4 hereof
unless and until such holder shall have provided all such information. Each
holder of Registrable Notes as to which any Shelf Registration Statement is
being effected agrees to furnish promptly to the Company all information
required to be disclosed in order to make information previously furnished to
the Company by such Holder not materially misleading.

          (b) Subsequent Shelf Registrations.  If the Initial Shelf Registration
              ------------------------------
or any Subsequent Shelf Registration ceases to be effective for any reason at
any time during the Effectiveness Period (other than because of the sale of all
of the securities registered thereunder), the Issuers shall use their
commercially reasonable best efforts to obtain the prompt withdrawal of any
order suspending the effectiveness thereof, and in any event shall within 45
days of such cessation of effectiveness use their commercially reasonable best
efforts to amend the Initial Shelf Registration in a manner to obtain the
withdrawal of the order suspending the effectiveness thereof, or file an
additional "shelf" Registration Statement pursuant to Rule 415 covering all of
the Registrable Notes covered by and not sold under the Initial Shelf
Registration or an earlier Subsequent Shelf Registration (each, a "Subsequent
                                                                   ----------
Shelf Registration").  If a Subsequent Shelf Registration is filed, the Issuers
------------------
shall use their commercially reasonable best efforts to cause the Subsequent
Shelf Registration to be declared effective under the Securities Act as soon as
practicable after such filing and to keep such subsequent Shelf Registration
continuously effective for a period equal to the number of days in the
Effectiveness Period less the aggregate number of days during which the Initial
Shelf Registration or any Subsequent Shelf Registration was previously
continuously effective.  As used herein the term "Shelf Registration" means the
                                                  ------------------
Initial Shelf Registration and any Subsequent Shelf Registration.

          (c) Supplements and Amendments.  The Issuers shall promptly supplement
              --------------------------
and amend any Shelf Registration if required by the rules, regulations or
instructions applicable to the registration form used for such Shelf
Registration, if required by the Securities Act, or if reasonably requested by
the Holders of a majority in aggregate principal amount of the Registrable Notes
covered by such Registration Statement or by any underwriter of such Registrable
Notes.

          (d) Suspension of Shelf Registration Statement.  The Issuers'
              ------------------------------------------
obligation to keep the Shelf Registration Statement effective and usable for
offers and sales of the Registrable Securities may be suspended by the Issuers
in good faith for valid business reasons, including, without limitation, a
pending acquisition or divestiture of assets.  Any such period during which the
Issuers fail to keep the Shelf Registration Statement effective and usable for
offers and sales of Registrable Securities is referred to as a "Suspension
Period."  A Suspension Period shall commence on and include the date that the
Company gives notice that the Shelf Registration Statement is no longer
effective or the prospectus included therein is not longer usable for offers and
sales of the Registrable Securities and shall end on the date when each Holder
of Registrable Securities covered by such registration statement either receives
<PAGE>

                                     -11-

the copies of the supplemented or amended prospectus contemplated by Section
3(c) hereof or is advised in writing by the Company that the use of the
prospectus may be resumed; provided that no Suspension Period shall exceed 60
                           --------
days in any period of 365 consecutive days.

     4.   Additional Interest
          -------------------

          (a) The Issuers and the Initial Purchasers agree that the Holders will
suffer damages if the Issuers fail to fulfill their obligations under Section 2
or Section 3 hereof and that it would not be feasible to ascertain the extent of
such damages with precision.  Accordingly, the Issuers agree to pay, as
liquidated damages, additional interest on the Notes  ("Additional Interest")
                                                        -------------------
under the circumstances and to the extent set forth below (each of which shall
be given independent effect):

              (i)   if (A) neither the Exchange Offer Registration Statement nor
     the Initial Shelf Registration has been filed on or prior to the applicable
     Filing Date or (B) notwithstanding that the Issuers have consummated or
     will consummate the Exchange Offer, the Issuers are required to file a
     Shelf Registration and such Shelf Registration is not filed on or prior to
     the Filing Date applicable thereto, then, commencing on the day after any
     such Filing Date, Additional Interest shall accrue on the principal amount
     of the Securities at a rate of 0.50% per annum for the first 90 days
     immediately following each such Filing Date, and such Additional Interest
     rate shall increase by an additional 0.50% per annum at the beginning of
     each subsequent 90-day period; or

              (ii)  if (A) neither the Exchange Offer Registration Statement nor
     the Initial Shelf Registration is declared effective by the SEC on or prior
     to the relevant Effectiveness Date or (B) notwithstanding that the Issuers
     have consummated or will consummate the Exchange Offer, the Issuers are
     required to file a Shelf Registration and such Shelf Registration is not
     declared effective by the SEC on or prior to the Effectiveness Date in
     respect of such Shelf Registration, then, commencing on the day after such
     Effectiveness Date, Additional Interest shall accrue on the principal
     amount of the Securities at a rate of 0.50% per annum for the first 90 days
     immediately following each such Effectiveness Date, and such Additional
     Interest rate shall increase by an additional 0.50% per annum at the
     beginning of each subsequent 90-day period; or

              (iii) if (A) the Issuers have not exchanged Exchange Notes for all
     Securities validly tendered in accordance with the terms of the Exchange
     Offer on or prior to the 45th day after the effective date of the Exchange
     Offer Registration Statement or (B) if applicable, a Shelf Registration has
     been declared effective and such Shelf Registration ceases to be effective
     at any time during the Effectiveness Period (other than as a result of a
     Suspension Period pursuant to Section 3(d)), then Additional Interest shall
     accrue on the principal amount of the Securities at a rate of 0.50% per
     annum for
<PAGE>

                                     -12-

     the first 90 days commencing on the (x) 46th day after the Issue Date, in
     the case of (A) above, or (y) the day such Shelf Registration ceases to be
     effective in the case of (B) above, and such Additional Interest rate shall
     increase by an additional 0.50% per annum at the beginning of each such
     subsequent 90-day period;

provided, however, that the Additional Interest rate on the Notes may not accrue
--------  -------
under more than one of the foregoing clauses (i)-(iii) at any one time and at no
time shall the aggregate amount of Additional Interest exceed 1.00% per annum;
provided, further, however, that (1) upon the filing of the applicable Exchange
--------  -------  -------
Offer Registration Statement or the applicable Shelf Registration Statement as
required hereunder (in the case of clause (i) above of this Section 4), (2) upon
the effectiveness of the Exchange Offer Registration Statement or the applicable
Shelf Registration Statement as required hereunder (in the case of clause (ii)
of this Section 4), or (3) upon the exchange of the applicable Exchange Notes
for all Securities tendered (in the case of clause (iii)(A) of this Section 4),
or upon the effectiveness of the applicable Shelf Registration Statement which
had ceased to remain effective (in the case of (iii)(B) of this Section 4),
Additional Interest on the Notes in respect of which such events relate as a
result of such clause (or the relevant subclause thereof), as the case may be,
shall cease to accrue.

          (b)  The Issuers shall notify the Trustee within three business days
after each and every date on which an event occurs in respect of which
Additional Interest is required to be paid (an "Event Date").  Any amounts of
                                                ----------
Additional Interest due pursuant to (a)(i), (a)(ii) or (a)(iii) of this Section
4 will be payable in cash semiannually on each May 1 and November 1, (to the
holders of record on the April 15 and October 15 immediately preceding such
dates), commencing with the first such date occurring after any such Additional
Interest commences to accrue.  The amount of Additional Interest will be
determined by multiplying the applicable Additional Interest rate by the
principal amount of the Registrable Notes, multiplied by a fraction, the
numerator of which is the number of days such Additional Interest rate was
applicable during such period (determined on the basis of a 360-day year
comprised of twelve 30-day months and, in the case of a partial month, the
actual number of days elapsed), and the denominator of which is 360.

     5.   Registration Procedures
          -----------------------

          In connection with the filing of any Registration Statement pursuant
to Sections 2 or 3 hereof, the Issuers shall effect such registrations to permit
the sale of the securities covered thereby in accordance with the intended
method or methods of disposition thereof, and pursuant thereto and in connection
with any Registration Statement filed by the Issuers hereunder each of the
Issuers shall:

          (a)  Prepare and file with the SEC prior to the applicable Filing
Date, a Registration Statement or Registration Statements as prescribed by
Sections 2 or 3 hereof, and use their commercially reasonable best efforts to
cause each such Registration Statement to
<PAGE>

                                     -13-

become effective and remain effective as provided herein; provided, however,
                                                          --------  -------
that, if (1) such filing is pursuant to Section 3 hereof, or (2) a Prospectus
contained in the Exchange Offer Registration Statement filed pursuant to Section
2 hereof is required to be delivered under the Securities Act by any
Participating Broker-Dealer who seeks to sell Exchange Notes during the
Applicable Period relating thereto, before filing any Registration Statement or
Prospectus or any amendments or supplements thereto, the Issuers shall furnish
to and afford the Holders of the Registrable Notes included in such Registration
Statement or each such Participating Broker-Dealer identified to the Issuers, as
the case may be, their counsel and the managing underwriters, if any, a
reasonable opportunity to review copies of all such documents (including copies
of any documents to be incorporated by reference therein and all exhibits
thereto) proposed to be filed (in each case at least five days prior to such
filing, or such later date as is reasonable under the circumstances). The
Issuers shall not file any Registration Statement or Prospectus or any
amendments or supplements thereto if the Holders of a majority in aggregate
principal amount of the Registrable Notes included in such Registration
Statement, or any such Participating Broker-Dealer, as the case may be, their
counsel, or the managing underwriters, if any, shall reasonably object on a
timely basis unless in the opinion of counsel to the Issuers the filing thereof
is required by law.

          (b)  Use their commercially reasonable best efforts to prepare and
file with the SEC such amendments and post-effective amendments to each Shelf
Registration Statement or the Exchange Offer Registration Statement, as the case
may be, as may be necessary to keep such Registration Statement continuously
effective for the Effectiveness Period or the Applicable Period, as the case may
be; cause the related Prospectus to be supplemented by any Prospectus supplement
required by applicable law, and as so supplemented to be filed pursuant to Rule
424 (or any similar provisions then in force) promulgated under the Securities
Act; and comply with the provisions of the Securities Act and the Exchange Act
applicable to each of them with respect to the disposition of all securities
covered by such Registration Statement as so amended or in such Prospectus as so
supplemented and with respect to the subsequent resale of any securities being
sold by a Participating Broker-Dealer covered by any such Prospectus. The
Issuers shall be deemed to have used their commercially reasonable best efforts
to keep a Registration Statement effective during the Effectiveness Period or
the Applicable Period, as the case may be, relating thereto, even if the Issuers
voluntarily take any action that results in selling Holders of the Registrable
Notes covered thereby or Participating Broker-Dealers seeking to sell Exchange
Notes not being able to sell such Registrable Notes or such Exchange Notes
during that period if such action is required by applicable law or if the
Issuers comply with this Agreement, including Section 3(d) which shall be
applicable to the Exchange Offer Registration Statement during the applicable
period and Section 5(j) and the last paragraph of this Section 5.

          (c)  If (1) a Shelf Registration is filed pursuant to Section 3
hereof, or (2) a Prospectus contained in the Exchange Offer Registration
Statement filed pursuant to Section 2 hereof is required to be delivered under
the Securities Act by any Participating Broker-Dealer
<PAGE>

                                     -14-

who seeks to sell Exchange Notes during the Applicable Period relating thereto
from whom the Issuers have received written notice that it will be a
Participating Broker-Dealer in the Exchange Offer, notify the selling Holders of
Registrable Notes, or each such Participating Broker-Dealer, as the case may be,
their counsel and the managing underwriters, if any, promptly (but in any event
within five business days), and confirm such notice in writing, (i) when a
Prospectus or any Prospectus supplement or post-effective amendment has been
filed, and, with respect to any applicable Registration Statement or any post-
effective amendment, when the same has become effective under the Securities Act
(including in such notice a written statement that any Holder may, upon request
in writing, obtain, at the sole expense of the Issuers, one conformed copy of
such Registration Statement or post-effective amendment including financial
statements and schedules, documents incorporated or deemed to be incorporated by
reference and exhibits), (ii) of the issuance by the SEC of any stop order
suspending the effectiveness of a Registration Statement or of any order
preventing or suspending the use of any preliminary prospectus or the initiation
of any proceedings for that purpose, (iii) if at any time when a prospectus is
required by the Securities Act to be delivered in connection with sales of the
Registrable Notes or resales of Exchange Notes by Participating Broker-Dealers
the representations and warranties of the Issuers contained in any agreement
(including any underwriting agreement) contemplated by Section 5(l) hereof cease
to be true and correct in all material respects, (iv) of the receipt by any
Issuer of any notification with respect to the suspension of the qualification
or exemption from qualification of a Registration Statement or any of the
Registrable Notes or the Exchange Notes to be sold by any Participating Broker-
Dealer for offer or sale in any jurisdiction, or the initiation or threatening
of any proceeding for such purpose, (v) of the happening of any event, the
existence of any condition or any information becoming known that makes any
statement made in such Registration Statement or related Prospectus or any
document incorporated or deemed to be incorporated therein by reference untrue
in any material respect or that requires the making of any changes in or
amendments or supplements to such Registration Statement, Prospectus or
documents so that, in the case of the Registration Statement, it will not
contain any untrue statement of a material fact or omit to state any material
fact required to be stated therein or necessary to make the statements therein
not misleading, and that in the case of the Prospectus, it will not contain any
untrue statement of a material fact or omit to state any material fact required
to be stated therein or necessary to make the statements therein, in light of
the circumstances under which they were made, not misleading; provided that such
                                                              --------
notification need not specifically identify such event if notification of the
occurrence thereof would, in the reasonable judgment of any Issuer, involve the
disclosure of confidential, nonpublic information, and (vi) of the Issuers'
determination that a post-effective amendment to a Registration Statement would
be appropriate.

          (d) If (1) a Shelf Registration is filed pursuant to Section 3 hereof,
or (2) a Prospectus contained in the Exchange Offer Registration Statement filed
pursuant to Section 2 hereof is required to be delivered under the Securities
Act by any Participating Broker-Dealer who seeks to sell Exchange Notes during
the Applicable Period relating thereto from whom
<PAGE>

                                     -15-

the Issuers have received written notice that it will be a Participating Broker-
Dealer in the Exchange Offer, use its commercially reasonable best efforts to
prevent the issuance of any order suspending the effectiveness of a Registration
Statement or of any order preventing or suspending the use of a Prospectus or
suspending the qualification (or exemption from qualification) of any of the
Registrable Notes or the Exchange Notes to be sold by any Participating Broker-
Dealer, for sale in any jurisdiction, and, if any such order is issued, to use
its reasonable best efforts to obtain the withdrawal of any such order at the
earliest possible moment.

          (e) If a Shelf Registration is filed pursuant to Section 3 and if
requested by the managing underwriter or underwriters (if any) or the Holders of
a majority in aggregate principal amount of the Registrable Notes being sold in
connection with an underwritten offering, (i) as promptly as practicable
incorporate in a prospectus supplement or post-effective amendment such
information as the managing underwriter or underwriters (if any), or such
Holders or counsel for any of them reasonably request to be included therein,
(ii) make all required filings of such prospectus supplement or such post-
effective amendment as soon as practicable after the Issuers have received
notification of the matters to be incorporated in such prospectus supplement or
post-effective amendment, and (iii) supplement or make amendments to such
Registration Statement; provided that the Issuers shall not be required to take
                        --------
any action pursuant to this paragraph (e) that would, in the opinion of counsel
to the Issuers, violate applicable law or any agreement to which the Issuers are
then subject.

          (f) If (1) a Shelf Registration is filed pursuant to Section 3 hereof,
or (2) a Prospectus contained in the Exchange Offer Registration Statement filed
pursuant to Section 2 hereof is required to be delivered under the Securities
Act by any Participating Broker-Dealer who seeks to sell Exchange Notes during
the Applicable Period relating thereto from whom the Issuers have received
written notice that it will be a Participating Broker-Dealer in the Exchange
Offer, furnish to each selling Holder of Registrable Notes and to each such
Participating Broker-Dealer who so requests and to their respective counsel and
each managing underwriter, if any, at the sole expense of the Issuers, one
conformed copy of the Registration Statement or Registration Statements and each
post-effective amendment thereto, including financial statements and schedules,
and, if requested in writing, all documents incorporated or deemed to be
incorporated therein by reference and all exhibits.

          (g) If (1) a Shelf Registration is filed pursuant to Section 3 hereof,
or (2) a Prospectus contained in the Exchange Offer Registration Statement filed
pursuant to Section 2 hereof is required to be delivered under the Securities
Act by any Participating Broker-Dealer who seeks to sell Exchange Notes during
the Applicable Period relating thereto from whom the Issuers have received
written notice that it will be a Participating Broker-Dealer in the Exchange
Offer, deliver to each selling Holder of Registrable Notes, or each such
Participating Broker-Dealer, as the case may be, their respective counsel, and
the underwriters, if any, at the sole expense of the Issuers, as many copies of
the Prospectus or Prospectuses (including each form of preliminary prospectus)
and each amendment or supplement thereto and, if requested
<PAGE>

                                     -16-

in writing, any documents incorporated by reference therein as such Persons may
reasonably request; and, subject to the last paragraph of this Section 5, the
Issuers hereby consent to the use of such Prospectus and each amendment or
supplement thereto (provided the manner of such use complies with any
limitations resulting from any applicable state securities "Blue Sky" laws as
provided in writing to such Holders by the Company and subject to the provisions
of this Agreement) by each of the selling Holders of Registrable Notes or each
such Participating Broker-Dealer, as the case may be, and the underwriters or
agents, if any, and dealers (if any), in connection with the offering and sale
of the Registrable Notes covered by, or the sale by Participating Broker-Dealers
of the Exchange Notes pursuant to, such Prospectus and any amendment or
supplement thereto.

          (h) Prior to any public offering of Registrable Notes or any delivery
of a Prospectus contained in the Exchange Offer Registration Statement by any
Participating Broker-Dealer who seeks to sell Exchange Notes during the
Applicable Period relating thereto from whom the Issuers have received written
notice that it will be a Participating Broker-Dealer in the Exchange Offer, use
its commercially reasonable best efforts to register or qualify, and to
cooperate with the selling Holders of Registrable Notes or each such
Participating Broker-Dealer, as the case may be, the managing underwriter or
underwriters, if any, and their respective counsel in connection with the
registration or qualification (or exemption from such registration or
qualification) of such Registrable Notes for offer and sale under the securities
or Blue Sky laws of such jurisdictions within the United States as any selling
Holder, Participating Broker-Dealer, or the managing underwriter or underwriters
reasonably request in writing; provided, however, that where Exchange Notes held
                               -------- --------
by Participating Broker-Dealers or Registrable Notes are offered other than
through an underwritten offering, the Issuers agree to cause their counsel to
(i) perform Blue Sky investigations and file registrations and qualifications
required to be filed pursuant to this Section 5(h), (ii) use its commercially
reasonable best efforts to keep each such registration or qualification (or
exemption therefrom) effective during the period such Registration Statement is
required to be kept effective and (iii) do any and all other acts or things
reasonably necessary or advisable to enable the disposition in such
jurisdictions of the Exchange Notes held by Participating Broker-Dealers or the
Registrable Notes covered by the applicable Registration Statement; provided,
                                                                    --------
however, that no Issuer shall be required to (A) qualify generally to do
-------
business in any jurisdiction where it is not then so qualified, (B) take any
action that would subject it to general service of process in any such
jurisdiction where it is not then so subject or (C) subject itself to taxation
in excess of a nominal dollar amount in any such jurisdiction where it is not
then so subject.

          (i) If a Shelf Registration is filed pursuant to Section 3 hereof,
cooperate with the selling Holders of Registrable Notes and the managing
underwriter or underwriters, if any, to facilitate the timely preparation and
delivery of certificates representing Registrable Notes to be sold, which
certificates shall not bear any restrictive legends and shall be in a form
eligible for deposit with The Depository Trust Company; and enable such
Registrable
<PAGE>

                                     -17-

Notes to be in such denominations and registered in such names as the managing
underwriter or underwriters, if any, or selling Holders may reasonably request.

          (j) If (1) a Shelf Registration is filed pursuant to Section 3 hereof,
or (2) a Prospectus contained in the Exchange Offer Registration Statement filed
pursuant to Section 2 hereof is required to be delivered under the Securities
Act by any Participating Broker-Dealer who seeks to sell Exchange Notes during
the Applicable Period relating thereto from whom the Issuers have received
written notice that it will be a Participating Broker-Dealer in the Exchange
Offer, upon the occurrence of any event contemplated by paragraph 5(c)(v) or
5(c)(vi) hereof, as promptly as practicable prepare and (subject to Section 3(d)
or Section 5(a) hereof) file with the SEC, at the sole expense of the Issuers, a
supplement or post-effective amendment to the Registration Statement or a
supplement to the related Prospectus or any document incorporated or deemed to
be incorporated therein by reference, or file any other required document so
that, as thereafter delivered to the purchasers of the Registrable Notes being
sold thereunder or to the purchasers of the Exchange Notes to whom such
Prospectus will be delivered by a Participating Broker-Dealer, any such
Prospectus will not contain an untrue statement of a material fact or omit to
state a material fact required to be stated therein or necessary to make the
statements therein, in light of the circumstances under which they were made,
not misleading.  Notwithstanding the foregoing, the Issuers shall not be
required to amend or supplement a Registration Statement, any related Prospectus
or any document incorporated therein by reference, in the event that, and for a
period not to exceed 60 days in any calendar year if, (i) an event occurs and is
continuing as a result of which the Shelf Registration would, in the Issuers'
good faith judgment, contain an untrue statement of a material fact or omit to
state a material fact necessary in order to make the statements therein, in the
light of the circumstances under which they were made, not misleading, and (ii)
(a) the Issuers determine in their good faith judgment that the disclosure of
such event at such time would have a material adverse effect on the business,
operations or prospects of the Issuers or (b) the disclosure otherwise relates
to a pending material business transaction that has not yet been publicly
disclosed.

          (k) Prior to the effective date of the first Registration Statement
relating to the Registrable Notes, (i) provide the Trustee with certificates for
the Registrable Notes in a form eligible for deposit with The Depository Trust
Company and (ii) provide a CUSIP number for the Registrable Notes.

          (l) In connection with any underwritten offering of Registrable Notes
pursuant to a Shelf Registration, enter into an underwriting agreement as is
customary in underwritten offerings of debt securities similar to the
Registrable Notes in form and substance reasonably satisfactory to the Issuers
and provided that the underwriters are reasonably acceptable to the Issuers and
take all such other actions as are reasonably requested by the managing
underwriter or underwriters in order to expedite or facilitate the registration
or the disposition of such Registrable Notes and, in such connection, if
reasonably requested (i) make such rep-
<PAGE>

                                     -18-

resentations and warranties to, and covenants with, the underwriters with
respect to the business of the Issuers and the subsidiaries of the Issuers
(including any acquired business, properties or entity, if applicable) and the
Registration Statement, Prospectus and documents, if any, incorporated or deemed
to be incorporated by reference therein, in each case, as are customarily made
by issuers to underwriters in underwritten offerings of debt securities similar
to the Registrable Notes, and confirm the same in writing if and when reasonably
requested in form and substance reasonably satisfactory to the Issuers; (ii)
upon the request of Holders of 40% of the Registrable Notes to be sold in such
underwritten offering, use its commercially reasonable best efforts to obtain
the written opinions of counsel to the Issuers and written updates thereof in
form, scope and substance reasonably satisfactory to the managing underwriter or
underwriters, addressed to the underwriters covering the matters customarily
covered in opinions reasonably requested in underwritten offerings and such
other matters as may be reasonably requested by the managing underwriter or
underwriters; (iii) upon the request of Holders of 40% of the Registrable Notes
to be sold in such underwritten offering, use its commercially reasonable best
efforts to obtain "cold comfort" letters and updates thereof in form, scope and
substance reasonably satisfactory to the managing underwriter or underwriters
from the independent public accountants of the Issuers (and, if necessary, any
other independent public accountants of the Issuers, any subsidiary of the
Issuers or of any business acquired by the Issuers for which financial
statements and financial data are, or are required to be, included or
incorporated by reference in the Registration Statement), addressed to each of
the underwriters, such letters to be in customary form and covering matters of
the type customarily covered in "cold comfort" letters in connection with
underwritten offerings of debt securities similar to the Registrable Notes and
such other matters as reasonably requested by the managing underwriter or
underwriters as permitted by the Statement on Auditing Standards No. 72; and
(iv) if an underwriting agreement is entered into, cause the same to contain
indemnification provisions and procedures no less favorable to the sellers and
underwriters, if any, than those set forth in Section 7 hereof (or such other
provisions and procedures acceptable to Holders of a majority in aggregate
principal amount of Registrable Notes covered by such Registration Statement and
the managing underwriter or underwriters or agents, if any). The above shall be
done at each closing under such underwriting agreement, or as and to the extent
required thereunder.

          (m) If (1) a Shelf Registration is filed pursuant to Section 3 hereof,
or (2) a Prospectus contained in the Exchange Offer Registration Statement filed
pursuant to Section 2 hereof is required to be delivered under the Securities
Act by any Participating Broker-Dealer who seeks to sell Exchange Notes during
the Applicable Period relating thereto from whom the Issuers have received
written notice that it will be a Participating Broker-Dealer in the Exchange
Offer, make available for inspection by any selling Holder of such Registrable
Notes being sold, or each such Participating Broker-Dealer, as the case may be,
any underwriter participating in any such disposition of Registrable Notes, if
any, and any attorney, accountant or other agent retained by any such selling
Holder or each such Participating Broker-Dealer, as the case may be, or
underwriter (collectively, the "Inspectors"), at the offices where nor-
                                ----------
<PAGE>

                                     -19-

mally kept, during reasonable business hours, all financial and other records,
pertinent corporate documents and instruments of the Issuers and subsidiaries of
the Issuers (collectively, the "Records") as shall be reasonably necessary to
                                -------
enable them to exercise any applicable due diligence responsibilities, and cause
the officers, directors and employees of the Issuers and any of their
subsidiaries to supply all information reasonably requested by any such
Inspector in connection with such Registration Statement and Prospectus.  The
foregoing inspection and information gathering shall be coordinated on behalf of
the other parties by one counsel designated by such parties as described in
Section 6(b) hereof.  Each Inspector shall agree in writing that it will keep
the Records confidential and that it will not disclose any of the Records that
the Issuers determine, in good faith, to be confidential unless (i) the release
of such Records is ordered pursuant to a subpoena or other order from a court of
competent jurisdiction, or (ii) the information in such Records has been made
generally available to the public; provided, however, that prior notice shall be
                                   -------- --------
provided as soon as practicable to the Issuers of the potential disclosure of
any information by such Inspector pursuant to clause (i) of this sentence to
permit the Issuers to obtain a protective order or take other appropriate action
to prevent the disclosure of such information at the Company's sole expense (or
waive the provisions of this paragraph (m)) and that such Inspector shall take
such actions as are reasonably necessary to protect the confidentiality of such
information (if practicable) to the extent such action is otherwise not
inconsistent with, an impairment of or in derogation of the rights and interests
of the Holder or any Inspector.

          (n) Provide an indenture trustee for the Registrable Notes or the
Exchange Notes, as the case may be, and cause the Indenture or the trust
indenture provided for in Section 2(a) hereof, as the case may be, to be
qualified under the TIA not later than the effective date of the first
Registration Statement relating to the Registrable Notes; and in connection
therewith, cooperate with the trustee under any such indenture and the Holders
of the Registrable Notes to effect such changes to such indenture as may be
required for such indenture to be so qualified in accordance with the terms of
the TIA; and execute, and use its reasonable best efforts to cause such trustee
to execute, all documents as may be required to effect such changes, and all
other forms and documents required to be filed with the SEC to enable such
indenture to be so qualified in a timely manner.

          (o) Comply with all applicable rules and regulations of the SEC and
make generally available to its securityholders with regard to any applicable
Registration Statement, a consolidated earnings statement satisfying the
provisions of Section 11(a) of the Securities Act and Rule 158 thereunder (or
any similar rule promulgated under the Securities Act) no later than 60 days
after the end of any fiscal quarter (or 120 days after the end of any 12-month
period if such period is a fiscal year) (i) commencing at the end of any fiscal
quarter in which Registrable Notes are sold to underwriters in a firm commitment
or best efforts underwritten offering and (ii) if not sold to underwriters in
such an offering, commencing on the first day of the first fiscal quarter of the
Issuers after the effective date of a Registration Statement, which statements
shall cover said 12-month periods.
<PAGE>

                                     -20-

          (p) Upon consummation of the Exchange Offer or a Private Exchange,
obtain an opinion of counsel to the Issuers, if requested by the Trustee, in a
form customary for underwritten transactions, addressed to the Trustee for the
benefit of all Holders of Registrable Notes participating in the Exchange Offer
or the Private Exchange, as the case may be, that the Exchange Notes or Private
Exchange Notes, as the case may be, the related Guarantee and the related
indenture constitute legal, valid and binding obligations of the Issuers,
enforceable against them in accordance with their respective terms, subject to
customary exceptions and qualifications.

          (q) If the Exchange Offer or a Private Exchange is to be consummated,
upon delivery of the Registrable Notes by Holders to the Issuers (or to such
other Person as directed by the Issuers) in exchange for the Exchange Notes or
the Private Exchange Notes, as the case may be, the Issuers shall mark, or cause
to be marked, on such Registrable Notes that such Registrable Notes are being
cancelled in exchange for the Exchange Notes or the Private Exchange Notes, as
the case may be; in no event shall such Registrable Notes be marked as paid or
otherwise satisfied.

          (r) Cooperate with each seller of Registrable Notes covered by any
Registration Statement and each underwriter, if any, participating in the
disposition of such Registrable Notes and their respective counsel in connection
with any filings required to be made with the National Association of Securities
Dealers, Inc. (the "NASD").
                    ----

          (s) Use their commercially reasonable best efforts to take all other
steps reasonably necessary to effect the registration of the Registrable Notes
covered by a Registration Statement contemplated hereby.

          The Issuers may require each seller of Registrable Notes as to which
any registration is being effected to furnish to the Issuers such information
regarding such seller and the distribution of such Registrable Notes as the
Issuers may, from time to time, reasonably request.  The Issuers may exclude
from such registration the Registrable Notes of any seller so long as such
seller fails to furnish such information within a reasonable time after
receiving such request.  Each seller as to which any Shelf Registration is being
effected agrees to furnish promptly to the Issuers all information required to
be disclosed in order to make the information previously furnished to the
Issuers by such seller not materially misleading.

          Each Holder of Registrable Notes and each Participating Broker-Dealer
agrees by its acquisition of such Registrable Notes or Exchange Notes to be sold
by such Participating Broker-Dealer, as the case may be, that, upon actual
receipt of any notice from the Issuers of the happening of any event of the kind
described in Section 5(c)(ii), 5(c)(iv), 5(c)(v) or 5(c)(vi) hereof, such Holder
will forthwith discontinue disposition of such Registrable Notes covered by such
Registration Statement or Prospectus or Exchange Notes to be sold by such Holder
or Participating Broker-Dealer, as the case may be, until such Holder's or
Participating Broker-Dealer's receipt of the copies of the supplemented or
amended Prospectus contem-
<PAGE>

                                     -21-

plated by Section 5(j) hereof, or until it is advised in writing (the "Advice")
by the Issuers that the use of the applicable Prospectus may be resumed, and has
received copies of any amendments or supplements thereto. In the event that the
Issuers shall give any such notice, the Effectiveness Period or the Applicable
Period, as the case may be, shall be extended by the number of days during such
periods from and including the date of the giving of such notice to and
including the date when each seller of Registrable Notes covered by such
Registration Statement or Exchange Notes to be sold by such Participating
Broker-Dealer, as the case may be, shall have received (x) the copies of the
supplemented or amended Prospectus contemplated by Section 5(j) hereof or (y)
the Advice.

     6.  Registration Expenses
         ---------------------

          (a) All fees and expenses incident to the performance of or compliance
with this Agreement by the Issuers (other than any underwriting discounts or
commissions) shall be borne by the Issuers including, without limitation, (i)
all registration and filing fees (including, without limitation, (A) fees with
respect to filings required to be made with the NASD in connection with an
underwritten offering and (B) reasonable fees and expenses of compliance with
state securities or Blue Sky laws (including, without limitation, reasonable
fees and disbursements of counsel in connection with Blue Sky qualifications of
the Registrable Notes or Exchange Notes and determination of the eligibility of
the Registrable Notes or Exchange Notes for investment under the laws of such
jurisdictions (x) where the holders of Registrable Notes are located, in the
case of the Exchange Notes, or (y) as provided in Section 5(h) hereof, in the
case of Registrable Notes or Exchange Notes to be sold by a Participating
Broker-Dealer during the Applicable Period)), (ii) printing expenses, including,
without limitation, expenses of printing certificates for Registrable Notes or
Exchange Notes in a form eligible for deposit with The Depository Trust Company
and of printing prospectuses if the printing of prospectuses is requested by the
managing underwriter or underwriters, if any, by the Holders of a majority in
aggregate principal amount of the Registrable Notes included in any Registration
Statement or in respect of Registrable Notes or Exchange Notes to be sold by any
Participating Broker-Dealer during the Applicable Period, as the case may be,
(iii) messenger, telephone and delivery expenses, (iv) fees and disbursements of
counsel for the Issuers, (v) fees and disbursements of all independent certified
public accountants referred to in Section 5(l)(iii) hereof (including, without
limitation, the expenses of any special audit and "cold comfort" letters
required by or incident to such performance), (vi) Securities Act liability
insurance, if the Issuers desire such insurance, (vii) fees and expenses of all
other Persons retained by the Issuers, (viii) internal expenses of the Issuers
(including, without limitation, all salaries and expenses of officers and
employees of the Issuers performing legal or accounting duties), (ix) the
expense of any annual audit, (x) any fees and expenses incurred in connection
with the listing of the securities to be registered on any securities exchange,
and the obtaining of a rating of the securities, in each case, if applicable,
and (xi) the expenses relating to printing, word processing and distributing all
Registration Statements, underwriting agreements, indentures and any other
documents necessary in order to comply with this
<PAGE>

                                     -22-

Agreement. Anything contained herein to the contrary notwithstanding, the
Issuers shall not have any obligation whatsoever in respect of any underwriters'
discounts or commissions, brokerage commissions, dealers' selling concessions,
transfer taxes or any other selling expenses (other than those expressly
enumerated in clauses (i) through (xi) above) incurred in connection with the
underwriting, offering or sale of Registrable Notes or Exchange Notes by or on
behalf of any Person.

          (b) The Issuers shall reimburse the Holders of the Registrable Notes
being registered in a Shelf Registration for the reasonable fees and
disbursements of not more than one counsel (in addition to appropriate local
counsel) chosen by the Holders of a majority in aggregate principal amount of
the Registrable Notes to be included in such Registration Statement.  In
addition, the Issuers shall reimburse the Initial Purchasers for the reasonable
fees and expenses of one counsel in connection with the Exchange Offer, which
shall be Cahill Gordon & Reindel, and shall not be required to pay any other
legal expenses in connection therewith.

     7.  Indemnification
         ---------------

          (a) Each of the Issuers, jointly and severally, agrees to indemnify
and hold harmless each Holder of Registrable Notes and each Participating
Broker-Dealer selling Exchange Notes during the Applicable Period, the
affiliates, officers, directors, representatives, employees and agents of each
such Person, and each Person, if any, who controls any such Person within the
meaning of either Section 15 of the Securities Act or Section 20 of the Exchange
Act (each, a "Participant"), from and against any and all losses, claims,
              -----------
damages, judgments, liabilities and expenses (including, without limitation, the
reasonable legal fees and other expenses actually incurred in connection with
any suit, action or proceeding or any claim asserted) caused by, arising out of
or based upon any untrue statement or alleged untrue statement of a material
fact contained in any Registration Statement (or any amendment thereto) or
Prospectus (as amended or supplemented if the Issuers shall have furnished any
amendments or supplements thereto) or any preliminary prospectus, or caused by,
arising out of or based upon any omission or alleged omission to state therein a
material fact required to be stated therein or necessary to make the statements
therein, in the case of the Prospectus in light  of the circumstances under
which they were made, not misleading, except insofar as such losses, claims,
                                      ------
damages or liabilities are caused by any untrue statement or omission or alleged
untrue statement or omission made in reliance upon and in conformity with
information relating to any Participant furnished to the Issuers in writing by
such Participant expressly for use therein and with respect to any preliminary
Prospectus, to the extent that any such loss, claim, damage or liability arises
solely from the fact that any Participant sold Notes to a person to whom (i)
there was not sent or given a copy of the Prospectus (as amended or
supplemented) at or prior to the written confirmation of such sale if the
Issuers shall have previously furnished copies thereof to the Participant in
accordance herewith and the Prospectus (as amended or supplemented) would have
corrected any such untrue statement or omission or
<PAGE>

                                     -23-

(ii) there was delivered a copy of the Prospectus (as amended or supplemented)
after the Holder received written notice at least two business days prior to the
date of delivery of the Prospectus of any event described in Section 5(c)(ii),
5(c)(iii), 5(c)(iv), 5(c)(v) or 5(c)(vi) and failed to discontinue the delivery
of such Prospectus (as amended or supplemented); provided that with respect to
                                                 --------
Section 5(c)(iv) such Holder only needs to discontinue the delivery of such
Prospectus (as amended or supplemented) only in the specific jurisdiction
specified in the notice provided pursuant to Section 5(c)(iv).

          (b) Each Participant agrees, severally and not jointly, to indemnify
and hold harmless the Issuers, their respective affiliates, officers, directors,
representatives, employees and agents of each Issuer and each Person who
controls each Issuer within the meaning of Section 15 of the Securities Act or
Section 20 of the Exchange Act to the same extent (but on a several, and not
joint, basis) as the foregoing indemnity from the Issuers to each Participant,
but only with reference to information relating to such Participant furnished to
the Issuers in writing by such Participant expressly for use in any Registration
Statement or Prospectus, any amendment or supplement thereto, or any preliminary
prospectus.  The liability of any Participant under this paragraph shall in no
event exceed the proceeds received by such Participant from sales of Registrable
Notes or Exchange Notes giving rise to such obligations.

          (c) If any suit, action, proceeding (including any governmental or
regulatory investigation), claim or demand shall be brought or asserted against
any Person in respect of which indemnity may be sought pursuant to either of the
two preceding paragraphs, such Person (the "Indemnified Person") shall promptly
                                            ------------------
notify the Persons against whom such indemnity may be sought (the "Indemnifying
                                                                   ------------
Persons") in writing, and the Indemnifying Persons, upon request of the
-------
Indemnified Person, shall retain counsel reasonably satisfactory to the
Indemnified Person to represent the Indemnified Person and any others the
Indemnifying Person may reasonably designate in such proceeding and shall pay
the reasonable fees and expenses actually incurred by such counsel related to
such proceeding; provided, however, that the failure to so notify the
                 -----------------
Indemnifying Persons will not relieve it from any liability under paragraph (a)
or (b) above unless and to the extent such failure results in the forfeiture by
the Indemnifying Person of substantial rights and defenses and the Indemnifying
Person was not otherwise aware of such action or claim.  In any such proceeding,
any Indemnified Person shall have the right to retain its own counsel, but the
fees and expenses of such counsel shall be at the expense of such Indemnified
Person unless (i) the Indemnifying Persons and the Indemnified Person shall have
mutually agreed to the contrary, (ii) the Indemnifying Persons shall have failed
within a reasonable period of time to retain counsel reasonably satisfactory to
the Indemnified Person or (iii) the named parties in any such proceeding
(including any impleaded parties) include both any Indemnifying Person and the
Indemnified Person and representation of both parties by the same counsel would
be inappropriate due to actual or potential differing interests between them.
It is understood that the Indemnifying Persons shall not, in connection with
such proceeding or separate but substantially similar related proceeding in the
same jurisdiction arising out of the same general allegations, be liable for the
fees and ex-
<PAGE>

                                     -24-

penses of more than one separate firm (in addition to any local counsel) for all
Indemnified Persons, and that all such fees and expenses shall be reimbursed
promptly as they are incurred. Any such separate firm for the Participants and
such control Persons of Participants shall be designated in writing by
Participants who sold a majority in interest of Registrable Notes and Exchange
Notes sold by all such Participants and shall be reasonably acceptable to the
Issuers, and any such separate firm for the Issuers, their affiliates, officers,
directors, representatives, employees and agents and such control Persons of
such Issuer shall be designated in writing by the Company and shall be
reasonably acceptable to the Holders.

          The Indemnifying Person shall not be liable for any settlement of any
proceeding effected without its prior written consent (which consent shall not
be unreasonably withheld or delayed), but if settled with such consent or if
there be a final non-appealable judgment for the plaintiff for which the
Indemnified Person is entitled to indemnification pursuant to this Agreement,
each Indemnifying Person agrees to indemnify and hold harmless each Indemnified
Person from and against any loss or liability by reason of such settlement or
judgment.  No Indemnifying Person shall, without the prior written consent of
the Indemnified Person (which consent shall not be unreasonably withheld or
delayed), effect any settlement or compromise of any pending or threatened
proceeding in respect of which any Indemnified Person is or could have been a
party, or indemnity could have been sought hereunder by such Indemnified Person,
unless such settlement (A) includes an unconditional written release of such
Indemnified Person, in form and substance reasonably satisfactory to such
Indemnified Person, from all liability on claims that are the subject matter of
such proceeding and (B) does not include any statement as to an admission of
fault, culpability or failure to act by or on behalf of such Indemnified Person.

          (d) If the indemnification provided for in the first and second
paragraphs of this Section 7 is for any reason unavailable to, or insufficient
to hold harmless, an Indemnified Person in respect of any losses, claims,
damages or liabilities referred to therein, then each Indemnifying Person under
such paragraphs, in lieu of indemnifying such Indemnified Person thereunder and
in order to provide for just and equitable contribution, shall contribute to the
amount paid or payable by such Indemnified Person as a result of such losses,
claims, damages or liabilities in such proportion as is appropriate to reflect
the relative fault of the Indemnifying Person or Persons on the one hand and the
Indemnified Person or Persons on the other in connection with the statements or
omissions or alleged statements or omissions that resulted in such losses,
claims, damages or liabilities (or actions in respect thereof) as well as any
other relevant equitable considerations.  The relative fault of the parties
shall be determined by reference to, among other things, whether the untrue or
alleged untrue statement of a material fact or the omission or alleged omission
to state a material fact relates to information supplied by the Issuers on the
one hand or such Participant or such other Indemnified Person, as the case may
be, on the other, the parties' relative intent, knowledge, access to information
and opportunity to correct or prevent such statement or omission, and any other
equitable considerations appropriate in the circumstances.
<PAGE>

                                     -25-

          (e) The parties agree that it would not be just and equitable if
contribution pursuant to this Section 7 were determined by pro rata allocation
(even if the Participants were treated as one entity for such purpose) or by any
other method of allocation that does not take account of the equitable
considerations referred to in the immediately preceding paragraph.  The amount
paid or payable by an Indemnified Person as a result of the losses, claims,
damages, judgments, liabilities and expenses referred to in the immediately
preceding paragraph shall be deemed to include, subject to the limitations set
forth above, any reasonable legal or other expenses actually incurred by such
Indemnified Person in connection with investigating or defending any such action
or claim.  Notwithstanding the provisions of this Section 7, in no event shall a
Participant be required to contribute any amount in excess of the amount by
which proceeds received by such Participant from sales of Registrable Notes or
Exchange Notes, as the case may be, exceeds the amount of any damages that such
Participant has otherwise been required to pay or has paid by reason of such
untrue or alleged untrue statement or omission or alleged omission.  No Person
guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of
the Securities Act) shall be entitled to contribution from any Person who was
not guilty of such fraudulent misrepresentation.

          (f) Any losses, claims, damages, liabilities or expenses for which an
indemnified party is entitled to indemnification or contribution under this
Section 7 shall be paid by the Indemnifying Person to the Indemnified Person as
such losses, claims, damages, liabilities or expenses are incurred.  The
indemnity and contribution agreements contained in this Section 7 and the
representations and warranties of the Issuers set forth in this Agreement shall
remain operative and in full force and effect, regardless of (i) any
investigation made by or on behalf of any Holder or any person who controls a
Holder, the Issuers, their directors, officers, employees or agents or any
person controlling an Issuer, and (ii) any termination of this Agreement.

          (g) The indemnity and contribution agreements contained in this
Section 7 will be in addition to any liability which the Indemnifying Persons
may otherwise have to the Indemnified Persons referred to above.

     8.  Rules 144 and 144A
         ------------------

         Each of the Issuers covenants and agrees that it will file the reports
required to be filed by it under the Securities Act and the Exchange Act and the
rules and regulations adopted by the SEC thereunder in a timely manner in
accordance with the requirements of the Securities Act and the Exchange Act and,
for so long as any Registrable Notes remain outstanding, and if the Company is
not required to file such reports, the Company will, upon the request of any
Holder or beneficial owner of Registrable Notes, make available such information
of the type specified in Sections 13 and 15(d) of the Exchange Act.  The Company
further covenants and agrees, for so long as any Registrable Notes remain
outstanding, to make available to any Holder or beneficial owner of Registrable
Notes in connection with any sale
<PAGE>

                                     -26-

thereof and any prospective purchaser of such Registrable Notes from such Holder
or beneficial owner the information required by Rule 144A(d)(4) and 144(c) under
the Securities Act in order to permit resales of such Registrable Notes pursuant
to Rule 144A and Rule 144(k).

     9.  Underwritten Registrations
         --------------------------

         If any of the Registrable Notes covered by any Shelf Registration are
to be sold in an underwritten offering, the investment banker or investment
bankers and manager or managers that will manage the offering will be selected
by the Holders of a majority in aggregate principal amount of such Registrable
Notes included in such offering and shall be reasonably acceptable to the
Issuers.

          No Holder of Registrable Notes may participate in any underwritten
registration hereunder unless such Holder (a) agrees to sell such Holder's
Registrable Notes on the basis provided in any underwriting arrangements
approved by the Persons entitled hereunder to approve such arrangements and (b)
completes and executes all questionnaires, powers of attorney, indemnities,
underwriting agreements and other documents required under the terms of such
underwriting arrangements.

     10.  Miscellaneous
          -------------

          (a) No Inconsistent Agreements.  The Issuers have not, as of the date
              --------------------------
hereof, and the Issuers shall not, after the date of this Agreement, enter into
any agreement with respect to any of their securities that is inconsistent with
the rights granted to the Holders of Registrable Notes in this Agreement or
otherwise conflicts with the provisions hereof.  The rights granted to the
Holders hereunder do not in any way conflict with the rights granted to the
holders of the Issuers' other issued and outstanding securities under any such
agreements.  The Issuers will not enter into any agreement with respect to any
of their securities which will grant to any Person piggy-back registration
rights with respect to any Registration Statement.

          (b) Adjustments Affecting Registrable Notes.  The Issuers shall not,
              ---------------------------------------
directly or indirectly, take any action with respect to the Registrable Notes as
a class that would adversely affect the ability of the Holders of Registrable
Notes to include such Registrable Notes in a registration undertaken pursuant to
this Agreement.

          (c) Amendments and Waivers.  The provisions of this Agreement may not
              ----------------------
be amended, modified or supplemented, and waivers or consents to departures from
the provisions hereof may not be given, otherwise than with the prior written
consent of (I) the Issuers and (II)(A) the Holders of not less than a majority
in aggregate principal amount of the then outstanding Registrable Notes and (B)
in circumstances that would adversely affect the Participating Broker-Dealers,
the Participating Broker-Dealers holding not less than a majority in aggregate
principal amount of the Exchange Notes held by all Participating Broker-Dealers;
provided, however, that Section 7 and this Section 10(c) may not be amended,
--------  -------
modified or
<PAGE>

                                     -27-

supplemented without the prior written consent of each Holder and each
Participating Broker-Dealer (including any person who was a Holder or
Participating Broker-Dealer of Registrable Notes or Exchange Notes, as the case
may be, disposed of pursuant to any Registration Statement) affected by any such
amendment, modification or supplement. Notwithstanding the foregoing, a waiver
or consent to depart from the provisions hereof with respect to a matter that
relates exclusively to the rights of Holders of Registrable Notes whose
securities are being sold pursuant to a Registration Statement and that does not
directly or indirectly affect, impair, limit or compromise the rights of other
Holders of Registrable Notes may be given by Holders of at least a majority in
aggregate principal amount of the Registrable Notes being sold pursuant to such
Registration Statement.

          (d) Notices.  All notices and other communications (including, without
              -------
limitation, any notices or other communications to the Trustee) provided for or
permitted hereunder shall be made in writing by hand-delivery, registered first-
class mail, next-day air courier or facsimile:

             (i)  if to a Holder of the Registrable Notes or any Participating
     Broker-Dealer, at the most current address of such Holder or Participating
     Broker-Dealer, as the case may be, set forth on the records of the
     registrar under the Indenture.

             (ii) if to the Issuers, at the address as follows:

                     Building One Services Corporation
                     800 Connecticut Avenue, NW
                     Washington, DC  20006
                     Attention:  Chief Financial Officer

                  with copies to:


                     Morgan Lewis & Bockius, LLP
                     1800 M Street, NW
                     Washington, DC  20036
                     Attention:  Linda L. Griggs

          All such notices and communications shall be deemed to have been duly
given:  when delivered by hand, if personally delivered; five business days
after being deposited in the mail, postage prepaid, if mailed; one business day
after being timely delivered to a next-day air courier; and when transmission is
confirmed, if sent by facsimile.

          Copies of all such notices, demands or other communications shall be
concurrently delivered by the Person giving the same to the Trustee at the
address and in the manner specified in such Indenture.
<PAGE>

                                     -28-

          (e) Successors and Assigns.  This Agreement shall inure to the benefit
              ----------------------
of and be binding upon the successors and assigns of each of the parties hereto,
the Holders and the Participating Broker-Dealers; provided, however, that
                                                  --------  -------
nothing herein shall be deemed to permit any assignment, transfer or other
disposition of Registrable Notes in violation of the terms of the Purchase
Agreement or the Indenture.

          (f) Counterparts.  This Agreement may be executed in any number of
              ------------
counterparts and by the parties hereto in separate counterparts, each of which
when so executed shall be deemed to be an original and all of which taken
together shall constitute one and the same agreement.

          (g) Headings.  The headings in this Agreement are for convenience of
              --------
reference only and shall not limit or otherwise affect the meaning hereof.

          (H) Governing Law.  THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED
              -------------
IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK, AS APPLIED TO CONTRACTS
MADE AND PERFORMED ENTIRELY WITHIN THE STATE OF NEW YORK, WITHOUT REGARD TO
PRINCIPLES OF CONFLICTS OF LAW.  EACH OF THE PARTIES HERETO AGREES TO SUBMIT TO
THE JURISDICTION OF THE COURTS OF THE STATE OF NEW YORK IN ANY ACTION OR
PROCEEDING ARISING OUT OF OR RELATING TO THIS AGREEMENT.

          (i) Severability.  If any term, provision, covenant or restriction of
              ------------
this Agreement is held by a court of competent jurisdiction to be invalid,
illegal, void or unenforceable, the remainder of the terms, provisions,
covenants and restrictions set forth herein shall remain in full force and
effect and shall in no way be affected, impaired or invalidated, and the parties
hereto shall use their best efforts to find and employ an alternative means to
achieve the same or substantially the same result as that contemplated by such
term, provision, covenant or restriction.  It is hereby stipulated and declared
to be the intention of the parties that they would have executed the remaining
terms, provisions, covenants and restrictions without including any of such that
may be hereafter declared invalid, illegal, void or unenforceable.

          (j) Securities Held by the Issuers or Their Affiliates.  Whenever the
              --------------------------------------------------
consent or approval of Holders of a specified percentage of Registrable Notes is
required hereunder, Registrable Notes held by the Issuers or their affiliates
(as such term is defined in Rule 405 under the Securities Act) shall not be
counted in determining whether such consent or approval was given by the Holders
of such required percentage.

          (k) Third-Party Beneficiaries.  Holders of Registrable Notes and
              -------------------------
Participating Broker-Dealers are intended third-party beneficiaries of this
Agreement, and this Agreement may be enforced by such Persons.
<PAGE>

                                     -29-

          (l) Entire Agreement.  This Agreement, together with the Purchase
              ----------------
Agreement and the Indenture, is intended by the parties as a final and exclusive
statement of the agreement and understanding of the parties hereto in respect of
the subject matter contained herein and therein and any and all prior oral or
written agreements, representations, or warranties, contracts, understandings,
correspondence, conversations and memoranda between the Holders on the one hand
and the Issuers on the other, or between or among any agents, representatives,
parents, subsidiaries, affiliates, predecessors in interest or successors in
interest with respect to the subject matter hereof and thereof are merged herein
and replaced hereby.
<PAGE>

                                      S-1

          WITNESS the due execution hereof by the respective duly authorized
officers of the undersigned as of the date first written above.

                                  BUILDING ONE SERVICES CORPORATION,
                                     as Issuer

                                  By:_______________________________
                                     Name:
                                     Title:

                                  ADVENT ELECTRIC CO., INC.
                                  AMERICAN AIR COMPANY, INC.
                                  APPEARANCE MANAGEMENT SERVICES, INC.
                                  BELTLINE MECHANICAL SERVICES, INC.
                                  BOXBERGER, INC.
                                  BRICK, INC.
                                  BUILDING ONE MECHANICAL SERVICES, INC.
                                  BUILDING ONE SERVICE SOLUTIONS, INC.
                                  BUYR, INC.
                                  CENTER SERVICES, INC.
                                  CONSOLIDATED ELECTRICAL GROUP, INC.
                                  D/FW MECHANICAL SERVICES, INC.
                                  FLOR-SHIN, INC.
                                  GAMEWELL MECHANICAL, INC.
                                  GARFIELD-INDECON ELECTRICAL SERVICES, INC.
                                  G.S. GROUP, INC.
                                  G.S. FINANCIAL, INC.
                                  GULF STATES, INC.
                                  G.S.I. OF CALIFORNIA, INC.
                                  TESTRONICS, INC.
                                  BRAZOSPORT MANAGEMENT, INC.
                                  HUNT ELECTRIC, INC.
                                  IVEY MECHANICAL COMPANY, INC.

<PAGE>

                                      S-2

                                  BARNES IVEY MECHANICAL COMPANY, L.L.C.
                                  LEXINGTON/IVEY MECHANICAL COMPANY, LLC
                                  IVEY MECHANICAL SERVICES, L.L.C.
                                  THE LEWIS COMPANIES, INC.
                                  OIL CAPITAL ELECTRIC, INC.
                                  ENGINEERING DESIGN GROUP, INC.
                                  ELECTRICAL DESIGN & CONSTRUCTION, INC.
                                  FRED CLARK ELECTRICAL CONTRACTOR INC.
                                  OMNI MECHANICAL COMPANY
                                  OMNI MECHANICAL SERVICES
                                  MCINTOSH MECHANICAL, INC.
                                  NATIONAL NETWORK SERVICES, INC.
                                  PERIMETER MAINTENANCE CORPORATION
                                  POTTER ELECTRIC CO., INC.
                                  REGENCY ELECTRIC COMPANY, INC.
                                  REGENCY ELECTRIC COMPANY JACKSONVILLE
                                  OFFICE, INC.
                                  REGENCY ELECTRIC COMPANY ORLANDO OFFICE, INC.
                                  REGENCY ELECTRIC COMPANY ATLANTA OFFICE
                                  REGENCY ELECTRIC COMPANY MEMPHIS OFFICE, INC.
                                  REGENCY ELECTRIC COMPANY PROJECTS GROUP, INC.
                                  REGENCY ELECTRIC COMPANY SOUTH FLORIDA, INC.
                                  REGENCY ELECTRIC COMPANY CHARLOTTE
                                  OFFICE, INC.
                                  RELIABLE PAPER SERVICE COMPANY, INC.
                                  RIVIERA ELECTRIC CONSTRUCTION CO.
                                  RIVIERA ELECTRIC OF CALIFORNIA, INC.
                                  ROBINSON MECHANICAL COMPANY
                                  SANDERS BROS., INC.
                                  SKC ELECTRIC, INC.
<PAGE>

                                     S-3

                                  CRAMAR ELECTRIC, INC.
                                  SKCE, INC.
                                  PRO WIRE SECURITY SYSTEMS, INC.
                                  SPANN BUILDING MAINTENANCE COMPANY
                                  SPANN MANAGEMENT GROUP, INC.
                                  TAYLOR ELECTRIC, INC.
                                  TESS HOLDINGS, INC.
                                  CREST INTERNATIONAL, LLC
                                  TOWN & COUNTRY ELECTRIC, INC.
                                  TRI-CITY ELECTRICAL CONTRACTORS, INC.
                                  TRI-M HOLDING CORP.
                                  TRI-M CORPORATION
                                  TRI-M ELECTRICAL CONSTRUCTION CORP.
                                  TRI-M BUILDING AUTOMATION SYSTEMS CORP.
                                  TRI-M INFORMATION SYSTEMS CORP.
                                  TRI-M INTEGRATED SYSTEM SOLUTIONS CORP.
                                  WALKER ENGINEERING, INC.
                                  WARREN ELECTRICAL CONSTRUCTION CORP.
                                  WATSON ELECTRICAL CONSTRUCTION CO.
                                  WILSON ELECTRIC COMPANY, INC.
                                  CHAMBERS ELECTRONIC COMMUNICATIONS, INC.

                                     BY:_______________________________
                                        Name:
                                        Title:
<PAGE>

                                      S-4

The foregoing Agreement is hereby confirmed and accepted as of the date first
above written.

BT ALEX. BROWN INCORPORATED

BEAR, STEARNS & CO. INC.
GOLDMAN, SACHS & CO.
SALOMON SMITH BARNEY INC.
FRIEDMAN, BILLINGS, RAMSEY & CO. INC.
JEFFERIES & COMPANY, INC.
FLEET SECURITIES, INC.
 as Initial Purchasers
c/o BT Alex. Brown Incorporated

By:_____________________
   Name:
   Title: