Document:

<PAGE>
                                                                     EXHIBIT 4.2

                                 AMENDMENT NO. 1
                                     TO THE
                         NCI 401(k) PROFIT SHARING PLAN
                           January 1, 2001 Restatement

         THIS AMENDMENT NO. 1, executed this 7th day of March, 2002, and
effective the first day of January, 2002 unless specifically provided otherwise
in this Amendment No. 1, by NCI Building Systems, Inc., having its principal
office in Houston, Texas (hereinafter referred to as the "Company").

                              W I T N E S S E T H:

         WHEREAS, the Company amended and restated the NCI 401(k) Profit Sharing
Plan (the "Plan") effective January 1, 2001 except for certain provisions for
which another effective date was subsequently provided elsewhere in the terms of
the Plan to (i) incorporate the prior amendments to the Plan, (ii) to modify
certain provisions for administration purposes and (iii) bring the Plan into
compliance with the Internal Revenue Code of 1986, as amended (the "Code") as
modified by the Small Business Job Protection Act of 1996, the General Agreement
on Tariffs and Trade under the Uruguay Round Agreements Act of 1994, the
Taxpayer Relief Act of 1997, the Internal Revenue Service Restructuring and
Reform Act of 1998, and the Community Renewal Tax Relief Act of 2000, as well as
all applicable rules, regulations and administrative pronouncements enacted,
promulgated or issued since the date the Plan was last restated;

         WHEREAS, the Economic Growth and Tax Relief Reconciliation Act of 2001
("EGTRRA") was signed into law on June 7, 2001, many provisions of which
commence to apply to the Plan effective January 1, 2002;

         WHEREAS, the Company desires to adopt this Amendment No. 1 effective as
of January 1, 2002, unless specifically otherwise in this Amendment No. 1, to
(i) reflect certain provisions of EGTRRA, (ii) constitute good faith compliance
with the requirements of EGTRRA, (iii) increase the percentage limitation on
tax-deferred contributions for non-highly compensated employees, (iv) eliminate
certain restrictions on participants' rights to direct the investment of Company
stock held by the Plan and (v) add provisions regarding the adjustment of the
Company's quarterly Matching Contribution for the last calendar quarter of each
year to take into account participants' tax deferred contributions for the
entire calendar year; and

         WHEREAS, this Amendment No. 1, with respect to the Addendum to the Plan
added under paragraph 1 below; (i) is to be construed in accordance with EGTRRA
and the guidance issued thereunder and (ii) shall supersede the provisions of
the Plan to the extent those provisions are inconsistent with the provisions of
this Amendment No. 1;

         NOW, THEREFORE, in consideration of the premises and the covenants
herein contained, the Company hereby adopts the following Amendment No. 1 to the
Plan:

<PAGE>

1.       The Plan is hereby amended by adding the attached Addendum to the Plan
relating to the provisions of EGTRRA, effective as set forth therein.

                                    Addendum
                                     to the
                         NCI 401(k) Profit Sharing Plan

         This Addendum forms a part of Amendment No. 1 to the Plan and relates
to the provisions of the Economic Growth and Tax Relief Reconciliation Act of
2001.

SECTION I (Plan Section 1.1). INCREASE IN COMPENSATION LIMIT

The Compensation of each Participant taken into account in determining
allocations for any Plan Year beginning after December 31, 2001, shall not
exceed $200,000, as adjusted for cost-of-living increases in accordance with
Section 401(a)(17)(B) of the Code. Compensation means Compensation during the
Plan Year or such other consecutive 12-month period over which Compensation is
otherwise determined under the Plan (the determination period). The
cost-of-living adjustment in effect for a calendar year applies to Compensation
for the determination period that begins with or within such calendar year.

SECTION II (Plan Article V). ROLLOVERS FROM OTHER PLANS

Effective January 1, 2002, the Plan will accept Participant Rollover
Contributions and/or direct rollovers of distributions made after December 31,
2001, as set forth below. The Plan will accept a direct rollover of an eligible
rollover distribution from (i) a qualified plan described in Section 401(a) or
403(a) of the Code, including after-tax employee contributions, (ii) an annuity
contract described in Section 403(b) of the Code, excluding after-tax employee
contributions, (iii) a traditional Individual Retirement Account ("IRA") as
described in section 408(d)(3) of the Code, excluding after-tax contributions,
and (iv) an eligible plan under Section 457(b) of the Code which is maintained
by a state, political subdivision of a state, or any agency or instrumentality
of a state or political subdivision of a state. The Plan will accept a
Participant contribution of an eligible rollover distribution from (i) a
qualified plan described in Section 401(a) or 403(a) of the Code, (ii) an
annuity contract described in Section 403(b) of the Code, (iii) a traditional
Individual Retirement Account ("IRA") as described in section 408(d)(3) of the
Code, excluding after-tax contributions, and (iv) an eligible plan under Section
457(b) of the Code which is maintained by a state, political subdivision of a
state, or any agency or instrumentality of a state or political subdivision of a
state.

SECTION III (Plan Section 6.11). VESTING OF EMPLOYER MATCHING CONTRIBUTIONS

1.       Applicability. This Section shall apply to participants with accrued
         benefits derived from Employer Matching Contributions who complete an
         Hour of Service under the Plan in a Plan Year beginning after December
         31, 2001.

                                      -2-

<PAGE>

2.       Vesting Schedule for Employer Matching Contributions.

         A participants accrued benefit derived from employer matching
         contributions shall vest according to the following schedule:

<TABLE>
<CAPTION>
        YEARS OF VESTING SERVICE                VESTED INTEREST
<S>                                             <C>
less than one                                          0%
one, but less than two                                10%
two, but less than three                              20%
three, but less than four                             40%
four, but less than five                              60%
five, but less than six                               80%
six or more                                          100%
</TABLE>

SECTION IV (Plan Section 7.2). TAX-DEFERRED CONTRIBUTIONS -- CONTRIBUTION
LIMITATION

No Participant shall be permitted to have elective deferrals made under this
Plan, or any other qualified plan maintained by the Employer during any taxable
year, in excess of the dollar limitation contained in Section 402(g) of the Code
in effect for such taxable year, except to the extent permitted under Section X
of this Amendment No. 1 and Section 414(v) of the Code, if applicable.

SECTION V (Plan Section 7.10). REPEAL OF MULTIPLE USE TEST

The multiple use test described in Treasury Regulation Section 1.401(m)-2 and
Section 7.10 of the Plan shall not apply for Plan Years beginning after December
31, 2001.

SECTION VI (Plan Section 7.13). LIMITATIONS ON CONTRIBUTIONS

1.       Effective date. This section shall be effective for "limitation years"
beginning after December 31, 2001.

2.       Maximum annual addition. Except to the extent permitted under Section X
of this Amendment No. 1 and Section 414(v) of the Code, if applicable, the
"annual addition" that may be contributed or allocated to a Participant's
Account under the Plan for any "limitation year" shall not exceed the lesser of:

         (a)      $40,000, as adjusted for increases in the cost-of-living under
                  Section 415(d) of the Code, or

         (b)      100 percent of the Participant's compensation, within the
                  meaning of Section 415(c)(3) of the Code, for the "limitation
                  year".

                                      -3-

<PAGE>

The annual compensation limit referred to in (b) shall not apply to any
contribution for medical benefits after separation from service (within the
meaning of Section 401(h) or Section 419A(f)(2) of the Code) which is otherwise
treated as an "annual addition".

SECTION VII (Plan Section 13.6(c)). SUSPENSION PERIOD FOLLOWING HARDSHIP
DISTRIBUTION

A Participant who receives a distribution of Tax-Deferred Contributions after
December 31, 2001 on account of hardship shall be prohibited from making
"elective deferrals" and "employee contributions", as defined in Article VII,
under this and all other plans of the Employer or Related Company for 6 months
after receipt of the distribution. A participant who receives a distribution of
elective deferrals in calendar year 2001 on account of hardship shall be
prohibited from making elective deferrals and employee contributions under this
and all other plans of the Employer or Related Company for the period specified
in Section 13.6(c) of the Plan that was in effect prior to this Amendment.

SECTION VIII (Plan Section 15.4). ROLLOVERS DISREGARDED IN INVOLUNTARY CASHOUTS

Effective for distributions made after December 31, 2001, for purposes of
Section 15.4 of the Plan, the value of a Participant's nonforfeitable Account
balance shall be determined without regard to that portion of the Account
balance that is attributable to Rollover Contributions (and earnings allocable
thereto) within the meaning of Sections 402(c), 403(a)(4), 403(b)(8),
408(d)(3)(A)(ii), and 457(e)(16) of the Code. If the value of the Participant's
nonforfeitable Account balance as so determined is $5,000 or less, the Plan
shall immediately distribute the Participant's entire nonforfeitable Account
balance. This provision shall apply with respect to Participants who separated
from service after December 31, 2001.

SECTION IX (Plan Section 16.3). DIRECT ROLLOVERS OF PLAN DISTRIBUTIONS

1.       Effective date. This section shall apply to distributions made after
December 31, 2001.

2.       Modification of definition of "eligible retirement plan". For purposes
of the direct rollover provisions in Section 16.3 of the Plan, an "eligible
retirement plan" shall also mean an annuity contract described in Section 403(b)
of the Code and an eligible plan under Section 457(b) of the Code which is
maintained by a state, political subdivision of a state, or any agency or
instrumentality of a state or political subdivision of a state and which agrees
to separately account for amounts transferred into such plan from this Plan. The
definition of "eligible retirement plan" shall also apply in the case of a
distribution to a surviving spouse, or to a spouse or former spouse who is the
alternate payee under a qualified domestic relations order, as defined in
Section 414(p) of the Code.

3.       Modification of definition of "eligible rollover distribution" to
exclude hardship distributions. For purposes of the direct rollover provisions
in Section 16.3 of the Plan, any

                                      -4-

<PAGE>

amount that is distributed on account of hardship shall not be an "eligible
rollover distribution" and the distributees may not elect to have any portion of
such a distribution paid directly to an "eligible retirement plan".

4.       Modification of definition of "eligible rollover distribution" to
include after-tax employee contributions. For purposes of the direct rollover
provisions in Section 16.3 of the Plan, a portion of a distribution shall not
fail to be an "eligible rollover distribution" merely because the portion
consists of after-tax employee contributions which are not includible in gross
income. However, such portion may be transferred only to an individual
retirement account or annuity described in Section 408(a) or (b) of the Code, or
to a qualified defined contribution plan described in Section 401(a) or 403(a)
of the Code that agrees to separately account for amounts so transferred,
including separately accounting for the portion of such distribution which is
includible in gross income and the portion of such distribution which is not so
includible.

SECTION XI (Plan Article XXII). MODIFICATION OF TOP-HEAVY RULES

1.       Effective date. This section shall apply for purposes of determining
whether the Plan is a Top-Heavy Plan under Section 416(g) of the Code for Plan
Years beginning after December 31, 2001, and whether the Plan satisfies the
minimum benefits requirements of Section 416(c) of the Code for such Plan Years.
This Section amends Article XXII of the Plan.

2.       Determination of top-heavy status.

2.1.     Key employee. "Key employee" means any Employee or former Employee
(including any deceased Employee) who at any time during the Plan Year that
includes the determination date was an officer of the Employer having annual
compensation greater than $130,000 (as adjusted under Section 416(i)(1) of the
Code for Years beginning after December 31, 2002), a 5-percent owner of the
Employer, or a 1-percent owner of the Employer having annual compensation of
more than $150,000. For this purpose, "annual compensation" means compensation
within the meaning of Section 415(c)(3) of the Code. The determination of who is
a key employee will be made in accordance with Section 416(i)(1) of the Code and
the applicable regulations and other guidance of general applicability issued
thereunder.

2.2.     Determination of present values and amounts. This Section 2.2 shall
apply for purposes of determining the present values of accrued benefits and the
amounts of Account balances of Employees as of the determination date.

2.2.1.   Distributions during Plan Year ending on the determination date. The
present values of accrued benefits and the amounts of Account balances of an
Employee as of the determination date shall be increased by the distributions
made with respect to the Employee under the Plan and any plan aggregated with
the Plan under Section 416(g)(2) of the Code during the 1-year period ending on
the determination date. The preceding sentence shall also apply to distributions
under a terminated plan which, had it not been terminated, would have been
aggregated with the Plan under Section 416(g)(2)(A)(i) of the Code. In the case
of a distribution made for a reason other than separation from service, death,
or disability, this provision shall be applied by substituting "5-year period"
for "1-year period."

                                      -5-

<PAGE>

2.2.2.   Employees not performing services during Plan Year ending on the
determination date. The accrued benefits and Account of any individual who has
not performed services for the Employer during the 1-year period ending on the
determination date shall not be taken into account.

3.       Minimum benefits.

3.1.     Matching Contributions. Employer Matching Contributions shall be taken
into account for purposes of satisfying the minimum contribution requirements of
Section 416(c)(2) of the Code and the Plan. The preceding sentence shall apply
with respect to Matching Contributions under the Plan. Employer Matching
Contributions that are used to satisfy the minimum contribution requirements
shall be treated as Matching Contributions for purposes of the actual
contribution percentage test and other requirements of Section 401(m) of the
Code.

SECTION X CATCH-UP CONTRIBUTIONS

Effective for contributions after January 1, 2001, all Employees who are
eligible to make Tax-Deferred Contributions under this Plan and who have
attained age 50 before the close of the Plan Year shall be eligible to make
catch-up contributions in accordance with, and subject to the limitations of,
Section 414(v) of the Code. Such catch-up contributions shall not be taken into
account for purposes of the provisions of the Plan implementing the required
limitations of Sections 402(g) and 415 of the Code. The Plan shall not be
treated as failing to satisfy the provisions of the Plan implementing the
requirements of Section 401(k)(3), 401(k)(11), 401(k)(12), 410(b), or 416 of the
Code, as applicable, by reason of the making of such catch-up contributions.

2.       Section 4.2 of the Plan hereby is amended, effective for the Plan Years
beginning on and after January 1, 2002, by restating the first sentence thereof
in its entirety to read as follows:

         The amount of Tax-Deferred Contributions to be made to the Plan on
behalf of an Eligible Employee by his Employer shall be an integral percentage
of his Compensation (i) if the Eligible Employee is not a Highly Compensated
Employee for the Plan Year, of not less than one percent nor more than 50
percent or (ii) if the Eligible Employee is a Highly Compensated Employee for
the Plan Year, of not less than one percent nor more than six percent.

3.       Section 6.4 of the Plan hereby is amended, effective January 1, 2001,
by adding a new sentence to the end thereof to read as follows:

         Notwithstanding any provision of this Section 6.4 to the contrary, the
Regular Matching Contribution made by each Employer for the last calendar
quarter of each calendar year shall be adjusted as necessary to take into
account Participants' Tax-Deferred Contributions made for the relevant calendar
year up to six percent of each Participant's Compensation (based on Compensation
after the Participant became an Eligible Employee) to the extent such
Tax-Deferred Contributions were not taken into account for a prior calendar
quarter during such year

                                      -6-

<PAGE>

because the Participant's rate of Tax-Deferred Contributions for any calendar
quarter during the year was more or less than six percent of the Participant's
Compensation.

4.       Section 10.3 of the Plan hereby is amended, effective March 18, 2002,
by restating the first sentence thereof in its entirety to read as follows:

         Subject to any restrictions or limitations applicable to a particular
Investment Fund, a Participant may elect to transfer investments from any
Investment Fund to any other Investment Fund.

         IN WITNESS WHEREOF, the Company, acting by and through its duly
authorized officers, has caused this Amendment No. 1 to be executed as of the
day and year first above written.

                                        NCI BUILDING SYSTEMS, INC.

                                        By: /s/ Donnie R. Humphries
                                            ------------------------------------
                                            Donnie R. Humphries, Secretary

                                      -7-<PAGE>

                                                                     EXHIBIT 4.3

                                 AMENDMENT NO. 2
                                     TO THE
                         NCI 401(k) PROFIT SHARING PLAN

         THIS AMENDMENT NO. 2, executed this 21st day of May, 2003, and
effective as set forth herein, by NCI Building Systems, Inc., having its
principal office in Houston, Texas (hereinafter referred to as the "Company").

                              W I T N E S S E T H:

         WHEREAS, the Company amended and restated the NCI 401(k) Profit Sharing
Plan (the "Plan") effective generally as of January 1, 2001 to, among other
things, incorporate various changes to the Internal Revenue Code of 1986, as
amended applicable to the Plan; and

         WHEREAS, the Company amended the Plan further generally effective as of
January 1, 2002 to, among other things, incorporate certain provisions of the
Economic Growth and Tax Relief Reconciliation Act of 2001 applicable to the
Plan; and

         WHEREAS, the Company desires to adopt this Amendment No. 2 effective as
set forth herein to clarify certain administrative provisions applicable to the
Plan and to incorporate changes to the form of the volume submitter document
pursuant to which the Plan is maintained;

         NOW, THEREFORE, in consideration of the premises and the covenants
herein contained, the Company hereby adopts the following Amendment No. 2 to the
Plan:

1.       The Preamble to the Plan is hereby amended, effective January 1, 2001,
to add a new paragraph following the second paragraph thereof to read as
follows:

         Any sample amendment adopted by the Sponsor prior to this amendment and
restatement for purposes of complying with EGTRRA shall continue in effect after
this amendment and restatement.

2.       Section 7.1 of the Plan hereby is amended, effective January 1, 2001,
by restating the definition of testing year set forth therein in its entirety to
read as follows:

         The "TESTING YEAR" means the Plan Year immediately preceding the Plan
Year for which the limitations on "deferral percentages" and "contribution
percentages" of Highly Compensated Employees are being determined.

3.       Section 7.12 of the Plan hereby is amended, effective January 1, 2001,
by restatement in its entirety to read as follows:

         The income or loss attributable to "excess contributions" that are
distributed pursuant to this Article shall be determined by multiplying the
income or loss for the preceding Plan Year attributable to the Employee's
Sub-Account to which the "excess contributions" were credited by a fraction, the
numerator of which is the "excess contributions" made to such Sub-Account on the
Employee's behalf for the preceding Plan Year and the denominator of which is
(a) the

<PAGE>

balance of the Sub-Account on the last day of the preceding Plan Year, (b)
reduced by the gain attributable to contributions to such Sub-Account for the
preceding Plan Year, and (c) increased by the loss attributable to contributions
to such Sub-Account for the preceding Plan Year.

4.       Section 12.1 of the Plan hereby is amended, effective January 1, 2001,
by adding a new sentence to the end of the first paragraph thereof to read as
follows:

         To the extent that such written guidelines comply with the requirements
of Code Section 72(p), but are inconsistent with the provisions of this Article,
such written guidelines shall be given effect.

5.       Section 15.5 of the Plan hereby is amended, effective January 1, 2002,
by adding a new sentence to the end thereof to read as follows:

         With respect to distributions under the Plan made in calendar years
beginning on or after January 1, 2002, the Plan will apply the minimum
distribution requirements of Code Section 401(a)(9) in accordance with the
regulations under Code Section 401(a)(9) that were proposed in January 2001,
notwithstanding any provision of the Plan to the contrary. This provision shall
continue in effect until the end of the last calendar year beginning before the
effective date of final regulations under Code Section 401(a)(9) or such other
date specified in guidance published by the Internal Revenue Service.

6.       Section 18.4 of the Plan hereby is amended, effective January 1, 2001,
by restating the first sentence thereof in its entirety to read as follows:

         Whenever a claim for benefits under the Plan filed by any person
(herein referred to as the "Claimant") is denied, whether in whole or in part,
the Sponsor shall transmit a written notice of such decision to the Claimant
within 90 days of the date the claim was filed or, if special circumstances
require an extension, within 180 days of such date, which notice shall be
written in a manner calculated to be understood by the Claimant and shall
contain (i) a statement of the specific reasons for the denial of the claim,
(ii) specific reference to pertinent Plan provisions on which the denial is
based, (iii) a description of any additional material or information necessary
for the Claimant to perfect the claim and an explanation of why such information
is necessary, (iv) a statement that the Claimant is entitled to receive, upon
request and free of charge, reasonable access to, and copies of, all documents,
records and other information relevant to the Claimant's claim, (v) a
description of the review procedures and in the event of an adverse review
decision, a statement describing any voluntary review procedures and the
Claimant's right to obtain copies of such procedures, and (vi) a statement that
there is no further administrative review following the initial review, and that
the Claimant has a right to bring a civil action under ERISA Section 502(a) if
the Sponsor's decision on review is adverse to the Claimant.

7.       Section 18.4 of the Plan hereby is amended, effective January 1, 2002,
by adding a new paragraph to the end thereof to read as follows:

                                      -2-

<PAGE>

         Notwithstanding the foregoing, special procedures apply for processing
claims and reviewing prior claim determinations if a Claimant's claim for
benefits is contingent upon a determination as to whether a Participant is
Disabled under the Plan.

8.       Section 19.3 of the Plan hereby is amended, effective January 1, 2001,
by restating clause (ii) of paragraph (c) thereof in its entirety to read as
follows:

         (ii) the distribution the Participant receives is a "lump sum
distribution" as defined in Code Section 402(e)(4), without regard to clauses
(I), (II), (III), and (IV) of sub-paragraph (D)(i) thereof.

9.       Section 19.4 of the Plan hereby is amended, effective January 1, 2001,
by restating clause (i) of the second sentence thereof in its entirety to read
as follows:

         (i) the distribution would constitute a "lump sum distribution" as
defined in Code Section 402(e)(4), without regard to clauses (I), (II), (III),
or (IV) of sub-paragraph (D)(i) thereof,

         IN WITNESS WHEREOF, the Company, acting by and through its duly
authorized officers, has caused this Amendment No. 2 to be executed as of the
day and year first above written.

                                          NCI BUILDING SYSTEMS, INC.

                                          By: /s/ Donnie R. Humphries
                                              ----------------------------------
                                                 Donnie R. Humphries, Secretary

                                      -3-

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00059-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00059-of-00352.parquet"}]]