FIRST AMENDMENT
     This First Amendment (this “Amendment”) is entered into as of June 20,
2006, by and among BUILDERS FIRSTSOURCE, INC., a Delaware corporation
(“Borrower”), the Guarantors listed on the signature pages hereof, the Lenders
signatory hereto, and UBS AG, STAMFORD BRANCH, as Administrative Agent for the
Lenders (in such capacity, “Administrative Agent”).
RECITALS
     WHEREAS, Borrower, BUILDING PRODUCTS, LLC (formerly known as JLL Building
Products, LLC), the Lenders, the Administrative Agent, UBS SECURITIES LLC, as
joint arranger and joint book runner, DEUTSCHE BANK SECURITIES INC., as joint
arranger, joint book runner and syndication agent, UBS AG, STAMFORD BRANCH, as
issuing bank and collateral trustee, GENERAL ELECTRIC CAPITAL CORPORATION and
LASALLE BANK NATIONAL ASSOCIATION, as co-documentation agents, and UBS LOAN
FINANCE LLC, as swingline lender, are parties to that certain Credit Agreement
dated as of February 11, 2005 (as amended by Waiver No. 1 dated as of April 15,
2005 and as further amended, restated, supplemented or otherwise modified from
time to time, the “Credit Agreement”) (capitalized terms used herein without
definition have the meanings ascribed to such terms in the Credit Agreement);
     WHEREAS, Borrower has requested certain changes to Sections 6.08 and
6.10(c) of the Credit Agreement;
     WHEREAS, the Administrative Agent and the Required Lenders have agreed to
amend Sections 6.08 and 6.10(c) of the Credit Agreement on the terms and subject
to the conditions set forth herein;
     NOW THEREFORE, in consideration of the premises and the mutual covenants
herein contained, the parties hereto hereby agree as follows:
          Section 1. Section References. Unless otherwise expressly stated
herein, all Section references herein shall refer to Sections of the Credit
Agreement.
          Section 2. Amendment of Section 6.08 (Dividends). Section 6.08 is
hereby amended by deleting clause (e) thereof in its entirety and replacing it
with the following:
(e) (i) so long as no Default or Event of Default has occurred and is continuing
at the time of declaration thereof and so long as no Event of Default under
Section 8.01(a), (b), (g) or (h) has occurred and is continuing at the time of
payment thereof, following an IPO, dividends on the Borrower’s common stock in
an amount per fiscal year not to exceed the lesser of $10,000,000 and 6.0% of
the gross proceeds received in such IPO and (ii) so long as no Default or Event
of Default has occurred and is continuing at the time of making thereof, other

 

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Dividends; provided, that the total dividends and other Dividends under clauses
(i) and (ii) above shall not to exceed $75,000,000 over the term of this
Agreement.
          Section 3. Amendment of Section 6.10(c) (Limitation on Capital
Expenditures). Section 6.10(c) is hereby amended by deleting the table set forth
therein in its entirety and replacing it with the following:

              Amount (in Period   millions)
January 1, 2005 — December 31, 2005
  $ 36.0  
January 1, 2006 — December 31, 2006
  $ 46.0  
January 1, 2007 — December 31, 2007
  $ 48.0  
January 1, 2008 and thereafter
  $ 50.0  

          Section 4. Conditions Precedent. The effectiveness of this Amendment
is subject to the satisfaction of each of the following conditions precedent:
               (a) The Administrative Agent shall have received all of the
following, in form and substance satisfactory to the Administrative Agent:
               (i) Amendment Documents. This Amendment, duly executed by the
Borrower and the Guarantors (the “Amendment Documents”);
               (ii) Consent of Required Lenders. The written consent of the
Required Lenders to this Amendment; and
               (iii) Additional Information. Such additional documents,
instruments and information as the Administrative Agent may reasonably request
to effect the transactions contemplated hereby.
               (b) The representations and warranties contained herein and in
the Credit Agreement shall be true and correct in all material respects as of
the date hereof as if made on the date hereof (except for those which by their
terms specifically refer to an earlier date, in which case such representations
and warranties shall be true and correct in all material respects as of such
earlier date).
               (c) All corporate proceedings taken in connection with the
transactions contemplated by this Amendment and all other agreements, documents
and instruments executed or delivered pursuant hereto, and all legal matters
incident thereto, shall be reasonably satisfactory to the Administrative Agent.
               (d) No Default or Event of Default shall have occurred and be
continuing, after giving effect to this Amendment.

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          Section 5. Representations and Warranties. The Borrower hereby
represents and warrants to the Administrative Agent and the Lenders that, as of
the date of and after giving effect to this Amendment, (a) the execution,
delivery and performance of this Amendment and any and all other Amendment
Documents executed and/or delivered in connection herewith have been authorized
by all requisite corporate action on the part of the Borrower and will not
violate the Borrower’s certificate of incorporation or bylaws, (b) all
representations and warranties set forth in the Credit Agreement and in any
other Loan Document are true and correct in all material respects as if made
again on and as of such date (except those, if any, which by their terms
specifically relate only to an earlier date, in which case such representations
and warranties are true and correct in all material respects as of such earlier
date), (c) no Default or Event of Default has occurred and is continuing, and
(d) the Credit Agreement and all other Loan Documents are and remain legal,
valid, binding and enforceable obligations in accordance with the terms thereof.
          Section 6. Survival of Representations and Warranties. All
representations and warranties made in this Amendment or any other Loan Document
shall survive the execution and delivery of this Amendment and the other Loan
Documents, and no investigation by the Administrative Agent or the Lenders, or
any closing, shall affect the representations and warranties or the right of the
Administrative Agent and the Lenders to rely upon them.
          Section 7. Certain Waivers. Each of the Borrower and the Guarantor
hereby agrees that neither the Administrative Agent nor any Lender shall be
liable under a claim of, and hereby waives any claim against the Administrative
Agent and the Lenders based on, lender liability (including, but not limited to,
liability for breach of the implied covenant of good faith and fair dealing,
fraud, negligence, conversion, misrepresentation, duress, control and
interference, infliction of emotional distress and defamation and breach of
fiduciary duties) as a result of the amendments contained in Sections 2 and 3
above and any discussions or actions taken or not taken by the Administrative
Agent or the Lenders on or before the date hereof or the discussions conducted
in connection therewith, or any course of action taken by the Administrative
Agent or any Lender in response thereto or arising therefrom; provided, that the
foregoing waiver shall not include the waiver of any claims which are based on
the gross negligence or willful misconduct of the Administrative Agent or any
Lender or any of their respective agents. This Section 7 shall survive the
execution and delivery of this Amendment and the other Loan Documents and the
termination of the Credit Agreement.
          Section 8. Reference to Agreement. Each of the Loan Documents,
including the Credit Agreement, and any and all other agreements, documents or
instruments now or hereafter executed and/or delivered pursuant to the terms
hereof or pursuant to the terms of the Credit Agreement as amended hereby, are
hereby amended so that any reference in such Loan Documents to the Credit
Agreement, whether direct or indirect, shall mean a reference to the Credit
Agreement as amended hereby.
          Section 9. Costs and Expenses. The Borrower shall pay on demand all
reasonable out-of-pocket costs and expenses of the Administrative Agent
(including the

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reasonable fees, costs and expenses of counsel to the Administrative Agent)
incurred in connection with the preparation, execution and delivery of this
Amendment.
          Section 10. Governing Law. THIS AMENDMENT SHALL BE GOVERNED BY, AND
CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.
          Section 11. Headings. Section Headings in this Amendment are included
herein for convenience of reference only and shall not constitute a part of this
Amendment for any other purposes.
          Section 12. Execution. This Amendment may be executed in any number of
counterparts and by different 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. Delivery of an executed
counterpart of a signature page to this Amendment by telecopier shall be
effective as delivery of a manually executed counterpart of this Amendment.
          Section 13. Limited Effect. This Amendment relates only to the
specific matters covered herein, shall not be considered to be a waiver of any
rights any Lender may have under the Credit Agreement (other than as expressly
set forth herein), and shall not be considered to create a course of dealing or
to otherwise obligate any Lender to execute similar amendments under the same or
similar circumstances in the future.
          Section 14. Ratification By Guarantors. Each Guarantor hereby agrees
to this Amendment, and each Guarantor acknowledges that such Guarantor’s
Guarantee shall remain in full force and effect without modification thereto.
[signature pages follow]

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          IN WITNESS WHEREOF, the parties hereto have caused this amendment to
be executed by their respective officers thereunto duly authorized, as of the
date first above written.

            BUILDERS FIRSTSOURCE, INC.
as Borrower
      By:   /s/ Charles L. Horn         Name:   Charles L. Horn        Title:  
Senior Vice President & CFO        BUILDERS FIRSTSOURCE
NORTHEAST GROUP, LLC, as Guarantor
      By:   /s/ Charles L. Horn         Name:   Charles L. Horn        Title:  
Senior Vice President & CFO        BUILDERS FIRSTSOURCE – TEXAS
GENPAR, LLC, as Guarantor
      By:   /s/ Charles L. Horn         Name:   Charles L. Horn        Title:  
Senior Vice President & CFO        BUILDERS FIRSTSOURCE – MBS, LLC,
as Guarantor
      By:   /s/ Charles L. Horn         Name:   Charles L. Horn        Title:  
Senior Vice President & CFO        BUILDERS FIRSTSOURCE – TEXAS
GROUP, L.P., as Guarantor
      By:   /s/ Charles L. Horn         Name:   Charles L. Horn        Title:  
Senior Vice President & CFO   

BFS First Amendment Signature Page

 

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            BFS TEXAS, LLC, as Guarantor
      By:   /s/ Charles L. Horn         Name:   Charles L. Horn        Title:  
Senior Vice President & CFO        BUILDERS FIRSTSOURCE – SOUTH
TEXAS, L.P., as Guarantor
      By:   /s/ Charles L. Horn         Name:   Charles L. Horn        Title:  
Senior Vice President & CFO        BUILDERS FIRSTSOURCE – TEXAS
INSTALLED SALES, L.P., as Guarantor
      By:   /s/ Charles L. Horn         Name:   Charles L. Horn        Title:  
Senior Vice President & CFO        BFS IP, LLC, as Guarantor
      By:   /s/ Charles L. Horn         Name:   Charles L. Horn        Title:  
Senior Vice President & CFO        BUILDERS FIRSTSOURCE –
INTELLECTUAL PROPERTY, L.P., as
Guarantor
      By:   /s/ Charles L. Horn         Name:   Charles L. Horn        Title:  
Senior Vice President & CFO   

BFS First Amendment Signature Page

 

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            BUILDERS FIRSTSOURCE HOLDINGS,
INC., as Guarantor
      By:   /s/ Charles L. Horn         Name:   Charles L. Horn        Title:  
Senior Vice President & CFO        BUILDERS FIRSTSOURCE – DALLAS,
LLC, as Guarantor
      By:   /s/ Charles L. Horn         Name:   Charles L. Horn        Title:  
Senior Vice President & CFO        BUILDERS FIRSTSOURCE – FLORIDA,
LLC, as Guarantor
      By:   /s/ Charles L. Horn         Name:   Charles L. Horn        Title:  
Senior Vice President & CFO        BUILDERS FIRSTSOURCE – FLORIDA
DESIGN CENTER, LLC, as Guarantor
      By:   /s/ Charles L. Horn         Name:   Charles L. Horn        Title:  
Senior Vice President & CFO        BUILDERS FIRSTSOURCE – OHIO
VALLEY, LLC, as Guarantor
      By:   /s/ Charles L. Horn         Name:   Charles L. Horn        Title:  
Senior Vice President & CFO   

BFS First Amendment Signature Page

 

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            BFS, LLC, as Guarantor
      By:   /s/ Charles L. Horn         Name:   Charles L. Horn        Title:  
Senior Vice President & CFO        BUILDERS FIRSTSOURCE – ATLANTIC
GROUP, LLC, as Guarantor
      By:   /s/ Charles L. Horn         Name:   Charles L. Horn        Title:  
Senior Vice President & CFO        BUILDERS FIRSTSOURCE OF
NASHVILLE, INC., as Guarantor
      By:   /s/ Charles L. Horn         Name:   Charles L. Horn        Title:  
Senior Vice President & CFO        BUILDERS FIRSTSOURCE –
SOUTHEAST GROUP, LLC, as Guarantor
      By:   /s/ Charles L. Horn         Name:   Charles L. Horn        Title:  
Senior Vice President & CFO        CCWP, INC., as Guarantor
      By:   /s/ Charles L. Horn         Name:   Charles L. Horn        Title:  
Senior Vice President & CFO   

BFS First Amendment Signature Page

 

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            BUILDERS FIRSTSOURCE – RALEIGH,
LLC, as Guarantor
      By:   /s/ Charles L. Horn         Name:   Charles L. Horn        Title:  
Senior Vice President & CFO        BUILDERS FIRSTSOURCE –
COLORADO GROUP, LLC, as Guarantor
      By:   /s/ Charles L. Horn         Name:   Charles L. Horn        Title:  
Senior Vice President & CFO        BUILDERS FIRSTSOURCE –
COLORADO, LLC, as Guarantor
      By:   /s/ Charles L. Horn         Name:   Charles L. Horn        Title:  
Senior Vice President & CFO        BUILDERS FIRSTSOURCE FINANCING,
INC., as Guarantor
      By:   /s/ Charles L. Horn         Name:   Charles L. Horn        Title:  
Senior Vice President & CFO   

BFS First Amendment Signature Page

 

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            UBS AG, STAMFORD BRANCH,
as Administrative Agent
      By:   /s/ Richard L. Tavrow         Name:   Richard L. Tavrow       
Title:   Director              By:   /s/ Irja R. Otsa         Name:   Irja R.
Otsa        Title:   Associate Director     

BFS First Amendment Signature Page

 

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                  New Alliance Global CDO, Limited         By: AllianceBernstein
L.P., as         investment advisor    
 
           
 
  By:   /s/ Teresa McCarthy    
 
     
 
Name: Teresa McCarthy    
 
      Title: Vice President    
 
                ACM Income Fund, Inc.         By: AllianceBernstein L.P., as    
    investment advisor    
 
           
 
  By:   /s/ Teresa McCarthy    
 
     
 
Name: Teresa McCarthy    
 
      Title: Vice President    

BFS First Amendment Signature Page

 

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            LENDERS:

OLYMPIC CLO I, LTD
      By:   /s/ John M. Casparian         Name:   John M. Casparian       
Title:   Chief Operating Officer, (Manager) Centre Pacific, LLC   

BFS First Amendment Signature Page

 

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            LENDERS:

WHITNEY CLO I, LTD
      By:   /s/ John M. Casparian         Name:   John M. Casparian       
Title:   Chief Operating Officer, (Manager) Centre Pacific, LLC   

BFS First Amendment Signature Page

 

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            LENDERS:

Deutsche Bank Trust Company America
      By:   /s/ Paul O’Leary         Name:   Paul O’Leary        Title:   Vice
President              By:   /s/ Anca Trifan         Name:   Anca Trifan       
Title:   Director   

BFS First Amendment Signature Page

 

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            LENDERS:

GENERAL ELECTRIC CAPITAL
CORPORATION
      By:   /s/ James R. Persico         Name:   James R. Persico       
Title:   Duly Authorized Signatory   

BFS First Amendment Signature Page

 

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            LENDERS:

LASALLE BANK NATIONAL
ASSOCIATION
      By:   /s/ Terrence Ward         Name:   Terrance Ward        Title:  
Senior Vice President   

BFS First Amendment Signature Page

 

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            LENDERS:

LightPoint CLO 2004-1, Ltd.

LightPoint CLO III, Ltd.
      By:   /s/ Colin Donlan         Name:   Colin Donlan        Title:  
Director   

BFS First Amendment Signature Page

 

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            LENDERS:

UBS LOAN FINANCE LLC
      By:   /s/ Richard L. Tavrow         Name:   Richard L. Tavrow       
Title:   Director              By:   /s/ Irja R. Otsa         Name:   Irja R.
Otsa        Title:   Associate Director     

BFS First Amendment Signature Page