<SUBMISSION>
<ACCESSION-NUMBER>0000899243-03-000441
<TYPE>S-8
<PUBLIC-DOCUMENT-COUNT>2
<FILING-DATE>20030303
<EFFECTIVENESS-DATE>20030303
<FILER>
<COMPANY-DATA>
<CONFORMED-NAME>QUANTA SERVICES INC
<CIK>0001050915
<ASSIGNED-SIC>1731
<IRS-NUMBER>742851603
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<FILING-VALUES>
<FORM-TYPE>S-8
<ACT>33
<FILE-NUMBER>333-103570
<FILM-NUMBER>03590088
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>1360 POST OAK BLVD
<STREET2>SUITE 2100
<CITY>HOUSTON
<STATE>TX
<ZIP>77056
<PHONE>7133506000
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>1360 POST OAK BLVD SUITE 2100
<CITY>HOUSTON
<STATE>TX
<ZIP>77056
</MAIL-ADDRESS>
</FILER>
<DOCUMENT>
<TYPE>S-8
<SEQUENCE>1
<FILENAME>ds8.htm
<DESCRIPTION>QUANTA SERVICES, INC. 2001 STOCK INCENTIVE PLAN
<TEXT>
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<TITLE>Quanta Services, Inc. 2001 Stock Incentive Plan</TITLE>
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<P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000"><B>As filed with the Securities and Exchange Commission on March 3, 2003 </B></FONT></P><P
STYLE="margin-top:0px;margin-bottom:0px" ALIGN="right"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000"><B>Registration No. 333-<U>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</U> </B></FONT></P><HR SIZE="3" NOSHADE
COLOR="#000000" ALIGN="left"><P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000"><B>UNITED STATES </B></FONT></P><P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT
FACE="Times New Roman" SIZE="2" COLOR="#000000"><B>SECURITIES AND EXCHANGE COMMISSION </B></FONT></P><P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Washington, D.C. 20549
</FONT></P><P STYLE="margin-top:0px;margin-bottom:-6px"><FONT SIZE="1">&nbsp;</FONT></P><HR WIDTH="17%" SIZE="1" NOSHADE COLOR="#000000"><P STYLE="margin-top:0px;margin-bottom:-6px"><FONT SIZE="1">&nbsp;</FONT></P><P
STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="4" COLOR="#000000"><B>FORM S-8 </B></FONT></P><P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2"
COLOR="#000000">REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 </FONT></P><P STYLE="margin-top:0px;margin-bottom:-6px"><FONT SIZE="1">&nbsp;</FONT></P><HR WIDTH="17%" SIZE="1" NOSHADE COLOR="#000000"><P
STYLE="margin-top:0px;margin-bottom:-6px"><FONT SIZE="1">&nbsp;</FONT></P><P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="4" COLOR="#000000"><B>QUANTA SERVICES, INC. </B></FONT></P><P
STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="1" COLOR="#000000">(Exact name of registrant as specified in its charter) </FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT
SIZE="1">&nbsp;</FONT></P>
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<TD VALIGN="top" ALIGN="center" WIDTH="48%"> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000"><B>Delaware</B></FONT></P></TD>
<TD VALIGN="bottom" WIDTH="3%"><FONT FACE="Times New Roman" SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top" ALIGN="center" WIDTH="48%"> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000"><B>75-2851603</B></FONT></P></TD></TR>
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<TD VALIGN="top" ALIGN="center" WIDTH="48%"> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="1" COLOR="#000000"><B></B>(State or other jurisdiction<BR>of incorporation)<B></B></FONT></P></TD>
<TD VALIGN="bottom" WIDTH="3%"><FONT FACE="Times New Roman" SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top" ALIGN="center" WIDTH="48%"> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="1" COLOR="#000000"><B></B>(I.R.S. Employer<BR>Identification No.)<B></B></FONT></P></TD></TR>
</TABLE><P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P><P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">1360 Post
Oak Boulevard, Suite 2100 </FONT></P><P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Houston, Texas 77056 </FONT></P><P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT
FACE="Times New Roman" SIZE="1" COLOR="#000000">(Address, including zip code, of principal executive offices) </FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"
ALIGN="center"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000"><B>QUANTA SERVICES, INC. 2001 STOCK INCENTIVE PLAN </B></FONT></P><P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2"
COLOR="#000000"><B>(f/k/a Quanta Services, Inc. 1997 Stock Option Plan) </B></FONT></P><P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="1" COLOR="#000000">(Full title of the plan) </FONT></P><P
STYLE="margin-top:0px;margin-bottom:-6px"><FONT SIZE="1">&nbsp;</FONT></P><HR WIDTH="17%" SIZE="1" NOSHADE COLOR="#000000"><P STYLE="margin-top:0px;margin-bottom:-6px"><FONT SIZE="1">&nbsp;</FONT></P>
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<TD VALIGN="top" ALIGN="center" WIDTH="48%"> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Dana A. Gordon</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT
FACE="Times New Roman" SIZE="2" COLOR="#000000">Vice President, General Counsel &amp; Secretary</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Quanta Services,
Inc.</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">1360 Post Oak Boulevard, Suite 2100</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT
FACE="Times New Roman" SIZE="2" COLOR="#000000">Houston, Texas 77056</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">(713) 629-7600</FONT></P> <P
STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000"></FONT><FONT FACE="Times New Roman" SIZE="1" COLOR="#000000">(Name, address, including zip code, and telephone number,<BR>including area
code, of agent for service)</FONT><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000"></FONT></P></TD>
<TD VALIGN="bottom" WIDTH="3%"><FONT FACE="Times New Roman" SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top" WIDTH="48%"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Copy
to:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;T. Mark Edwards</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT
FACE="Times New Roman" SIZE="2" COLOR="#000000">Gardere Wynne Sewell LLP</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">1601 Elm Street</FONT></P> <P
STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Suite 3000</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2"
COLOR="#000000">Dallas, Texas 75201</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">(214) 999-4654</FONT></P></TD></TR>
</TABLE><P STYLE="margin-top:0px;margin-bottom:-6px"><FONT SIZE="1">&nbsp;</FONT></P><HR WIDTH="17%" SIZE="1" NOSHADE COLOR="#000000"><P STYLE="margin-top:0px;margin-bottom:-6px"><FONT
SIZE="1">&nbsp;</FONT></P><P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000"><B>CALCULATION OF REGISTRATION FEE </B></FONT></P><HR SIZE="3" NOSHADE COLOR="#000000" ALIGN="left">
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<TD VALIGN="bottom" WIDTH="46%" ALIGN="center"> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="1" COLOR="#000000"><B>Title of securities</B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"
ALIGN="center"><FONT FACE="Times New Roman" SIZE="1" COLOR="#000000"><B>to be registered</B></FONT></P></TD>
<TD VALIGN="bottom" WIDTH="3%"><FONT FACE="Times New Roman" SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="bottom" ALIGN="center"> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="1" COLOR="#000000"><B>Amount to be</B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT
FACE="Times New Roman" SIZE="1" COLOR="#000000"><B>registered (1)</B></FONT></P></TD>
<TD VALIGN="bottom" WIDTH="3%"><FONT FACE="Times New Roman" SIZE="1">&nbsp;&nbsp;&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom" ALIGN="center"> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="1" COLOR="#000000"><B><BR>Proposed&nbsp;maximum</B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"
ALIGN="center"><FONT FACE="Times New Roman" SIZE="1" COLOR="#000000"><B>offering&nbsp;price&nbsp;per</B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="1" COLOR="#000000"><B>share
(2)</B></FONT></P></TD>
<TD VALIGN="bottom" WIDTH="3%"><FONT FACE="Times New Roman" SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom" ALIGN="center"> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="1" COLOR="#000000"><B>Proposed&nbsp;maximum</B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"
ALIGN="center"><FONT FACE="Times New Roman" SIZE="1" COLOR="#000000"><B>aggregate&nbsp;offering</B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="1" COLOR="#000000"><B>price
(2)</B></FONT></P></TD>
<TD VALIGN="bottom" WIDTH="3%"><FONT FACE="Times New Roman" SIZE="1">&nbsp;&nbsp;&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom" ALIGN="center"> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="1" COLOR="#000000"><B>Amount of</B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT
FACE="Times New Roman" SIZE="1" COLOR="#000000"><B>registration fee</B></FONT></P></TD></TR>
<TR>
<TD VALIGN="bottom" COLSPAN="9"><HR SIZE="1" NOSHADE COLOR="#000000"></TD></TR>
<TR>
<TD VALIGN="top" ALIGN="center" WIDTH="46%"> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000"><B>Common Stock, $0.00001</B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"
ALIGN="center"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000"><B>Par value</B></FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P></TD>
<TD VALIGN="bottom" WIDTH="3%"><FONT FACE="Times New Roman" SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top" ALIGN="center" WIDTH="13%"> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000"><B>9,839,668&nbsp;shares</B></FONT></P></TD>
<TD VALIGN="bottom" WIDTH="3%"><FONT FACE="Times New Roman" SIZE="1">&nbsp;&nbsp;&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top" ALIGN="center" WIDTH="13%"> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000"><B>$3.07</B></FONT></P></TD>
<TD VALIGN="bottom" WIDTH="3%"><FONT FACE="Times New Roman" SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top" ALIGN="center" WIDTH="13%"> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000"><B>$30,207,781</B></FONT></P></TD>
<TD VALIGN="bottom" WIDTH="3%"><FONT FACE="Times New Roman" SIZE="1">&nbsp;&nbsp;&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top" ALIGN="center" WIDTH="13%"> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000"><B>$2,444</B></FONT></P></TD></TR>
</TABLE><HR SIZE="3" NOSHADE COLOR="#000000" ALIGN="left"><P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="3%" VALIGN="top" ALIGN="left"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">(1)</FONT></TD>
<TD WIDTH="1%" VALIGN="top"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD ALIGN="left" VALIGN="top"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Pursuant to Rule 416 under the Securities Act of 1933, shares issuable upon any stock split, stock dividend or similar transaction with respect to these shares are
also being registered hereunder. </FONT></TD></TR></TABLE><P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR>
<TD WIDTH="3%" VALIGN="top" ALIGN="left"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">(2)</FONT></TD>
<TD WIDTH="1%" VALIGN="top"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD ALIGN="left" VALIGN="top"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Calculated pursuant to Rule 457(h), based on the average of the high and low prices for the Common Stock as reported on the New York Stock Exchange Composite Tape
for February 25, 2003. </FONT></TD></TR></TABLE><P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P><P STYLE="margin-top:0px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Shares of
Common Stock of the Registrant for issuance pursuant to the Plan have previously been registered under a Registration Statement on Form S-8 (Registration No. 333-47069). These shares of Common Stock and the Plan are described in the Section 10(a)
prospectus for this registration statement in accordance with Rule 429 of the General Rules and Regulations under the Securities Act of 1933, as amended. </FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P><HR
SIZE="3" NOSHADE COLOR="#000000" ALIGN="left">

<p Style='page-break-before:always'>
<HR  SIZE="3" COLOR="#999999" WIDTH="100%" ALIGN="CENTER">
<P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000"><B>EXPLANATORY NOTE </B></FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT
SIZE="1">&nbsp;</FONT></P><P STYLE="margin-top:0px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Section 5 of the Quanta Services, Inc. 2001 Stock Incentive Plan, as amended (the &#147;Plan&#148;),
currently authorizes up to 13,410,943 shares of Common Stock of the Company to be issued under the Plan. A Registration Statement on Form S-8 (File No. 333-47069) was filed with the Securities and Exchange Commission on February 27, 1998 (the
&#147;Prior S-8&#148;), relating to the issuance of up to 2,380,850 shares of Common Stock under the Plan. Subsequent to the filing of the Prior S-8, the Board approved a 3-for-2 stock split of Common Stock which was paid as a stock dividend to
holders of the Common Stock of record at the close of business on March&nbsp;27, 2000. As a result of the stock split, an aggregate of 3,571,275 shares of Common Stock were deemed registered pursuant to the Prior S-8. The contents of the Prior S-8,
including documents incorporated by reference therein, are incorporated by reference into this Registration Statement. </FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"
ALIGN="center"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000"><B>PART II </B></FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman"
SIZE="2" COLOR="#000000"><B>Item 8.&nbsp;&nbsp;&nbsp;&nbsp;Exhibits </B></FONT></P><P STYLE="margin-top:0px;margin-bottom:-6px"><FONT SIZE="1">&nbsp;</FONT></P><P STYLE="margin-top:0px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman"
SIZE="2" COLOR="#000000">In addition to the exhibits filed or incorporated by reference into the Prior S-8, the following documents are filed as exhibits to this Registration Statement: </FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT
SIZE="1">&nbsp;</FONT></P><P STYLE="margin-top:0px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">&nbsp;&nbsp;&nbsp;&nbsp;5.1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Opinion of Gardere Wynne Sewell
LLP </FONT></P><P STYLE="margin-top:0px;margin-bottom:-6px"><FONT SIZE="1">&nbsp;</FONT></P><P STYLE="margin-top:0px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2"
COLOR="#000000">*23.1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Consent of Arthur Andersen LLP (omitted pursuant to Rule 437a) </FONT></P><P STYLE="margin-top:0px;margin-bottom:-6px"><FONT SIZE="1">&nbsp;</FONT></P><P
STYLE="margin-top:0px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">&nbsp;&nbsp;23.2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Consent of legal counsel (included as part of Exhibit 5.1) </FONT></P><P
STYLE="margin-top:0px;margin-bottom:-6px"><FONT SIZE="1">&nbsp;</FONT></P><P STYLE="margin-top:0px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2"
COLOR="#000000">&nbsp;&nbsp;24.1&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Power of Attorney (set forth on the signature page of this Registration Statement) </FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT
SIZE="1">&nbsp;</FONT></P><HR WIDTH="8%" SIZE="1" NOSHADE COLOR="#000000" ALIGN="left"><P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">* After reasonable efforts, the Registrant is unable to obtain
the consent of Arthur Andersen LLP in the incorporation in this Registration Statement of its report with respect to the Registrant&#146;s consolidated financial statements, which appeared in the Registrant&#146;s Annual Report on Form 10-K for the
year ended December 31, 2001. Under these circumstances, Rule 437a under the Securities Act permits this Registration Statement to be filed without the written consent from Arthur Andersen LLP. As a result, participants eligible to obtain Common
Stock under the Plan registered hereby may not be able to recover damages from Arthur Andersen LLP under Section 11 of the Securities Act, for any untrue statement of a material fact or any omission to state a material fact, contained in the
Registrant&#146;s consolidated financial statements for the year ended December 31, 2001. </FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P>
<P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">II-1 </FONT></P>


<p Style='page-break-before:always'>
<HR  SIZE="3" COLOR="#999999" WIDTH="100%" ALIGN="CENTER">
<P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P><P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000"><B>SIGNATURES
</B></FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P><P STYLE="margin-top:0px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Pursuant to the requirements of the
Securities Act of 1933, as amended, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused this Registration Statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the City of Houston, and the State of Texas, on March 3, 2003. </FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P><DIV STYLE="margin-top:0px;margin-bottom:0px"
ALIGN="right">
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<TD VALIGN="top" COLSPAN="3" WIDTH="37%"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">QUANTA SERVICES, INC.</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman"
SIZE="2" COLOR="#000000">(Registrant)</FONT></P></TD></TR>
<TR>
<TD HEIGHT="16"></TD></TR>
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<TD VALIGN="top" WIDTH="2%"> <P STYLE="margin-top:0px;margin-bottom:0px; margin-left:2%; text-indent:-2%"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">By:</FONT></P></TD>
<TD VALIGN="bottom" WIDTH="3%"><FONT FACE="Times New Roman" SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="top" WIDTH="37%"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">&nbsp;&nbsp;&nbsp;&nbsp;/s/&nbsp;&nbsp;&nbsp;&nbsp;JOHN R.
COLSON&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT></P><HR SIZE="1" NOSHADE COLOR="#000000" ALIGN="left"></TD></TR>
<TR>
<TD><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="bottom" WIDTH="3%"><FONT FACE="Times New Roman" SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="bottom" WIDTH="37%"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">John R. Colson<BR></FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2"
COLOR="#000000">Chief Executive Officer</FONT></P></TD></TR>
</TABLE></DIV><P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P><P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2"
COLOR="#000000">POWER OF ATTORNEY </FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P><P STYLE="margin-top:0px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Each of the
undersigned hereby appoints John R. Colson and James H. Haddox and each of them (with full power to act alone), as attorneys and agents for the undersigned, with full power of substitution, for and in the name, place and stead of the undersigned, to
sign and file with the Securities and Exchange Commission under the Securities Act of 1933 any and all amendments and exhibits to this Registration Statement and any and all applications, instruments and other documents to be filed with the
Securities and Exchange Commission pertaining to the registration of the securities covered hereby, with full power and authority to do and perform any and all acts and things whatsoever requisite or desirable. </FONT></P><P
STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P><P STYLE="margin-top:0px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Pursuant to the requirements of the Securities Act of 1933, as
amended, this Registration Statement has been signed below by the following persons in the capacities indicated on March 3, 2003. </FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P>
<TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="100%" BORDER="0">

<TR>
<TD VALIGN="bottom" WIDTH="50%" ALIGN="center"> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Signature</FONT></P><HR WIDTH="65" SIZE="1" NOSHADE COLOR="#000000"></TD>
<TD VALIGN="bottom" WIDTH="3%"><FONT FACE="Times New Roman" SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom" WIDTH="50%"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Title</FONT></P><HR WIDTH="30" SIZE="1" NOSHADE ALIGN="left" COLOR="#000000"></TD></TR>
<TR>
<TD HEIGHT="16"></TD></TR>
<TR>
<TD VALIGN="top" WIDTH="50%"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/s/&nbsp;&nbsp;&nbsp;&nbsp;JOHN R.
COLSON&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT></P><HR SIZE="1" NOSHADE COLOR="#000000" ALIGN="left"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">John R. Colson</FONT></P></TD>
<TD VALIGN="bottom" WIDTH="3%"><FONT FACE="Times New Roman" SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top" WIDTH="50%"> <P STYLE="margin-top:0px;margin-bottom:0px; margin-left:2%; text-indent:-2%"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Chief Executive Officer and Chairman of the</FONT></P> <P
STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Board of Directors</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">(principal executive
officer)</FONT></P></TD></TR>
<TR>
<TD HEIGHT="24"></TD></TR>
<TR>
<TD VALIGN="top" WIDTH="50%"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/s/&nbsp;&nbsp;&nbsp;&nbsp;JAMES H.
HADDOX&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT></P><HR SIZE="1" NOSHADE COLOR="#000000" ALIGN="left"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">James H. Haddox</FONT></P></TD>
<TD VALIGN="bottom" WIDTH="3%"><FONT FACE="Times New Roman" SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top" WIDTH="50%"> <P STYLE="margin-top:0px;margin-bottom:0px; margin-left:2%; text-indent:-2%"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Chief Financial Officer</FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT
FACE="Times New Roman" SIZE="2" COLOR="#000000">(principal financial officer)</FONT></P></TD></TR>
<TR>
<TD HEIGHT="24"></TD></TR>
<TR>
<TD VALIGN="top" WIDTH="50%"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/s/&nbsp;&nbsp;&nbsp;&nbsp;DERRICK A.
JENSEN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT></P><HR SIZE="1" NOSHADE COLOR="#000000" ALIGN="left"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Derrick A. Jensen</FONT></P></TD>
<TD VALIGN="bottom" WIDTH="3%"><FONT FACE="Times New Roman" SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top" WIDTH="50%"> <P STYLE="margin-top:0px;margin-bottom:0px; margin-left:2%; text-indent:-2%"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Vice President, Controller and Chief Accounting</FONT></P> <P
STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Officer (principal accounting officer)</FONT></P></TD></TR>
<TR>
<TD HEIGHT="24"></TD></TR>
<TR>
<TD VALIGN="top" WIDTH="50%"><HR SIZE="1" NOSHADE COLOR="#000000" ALIGN="left"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">James R. Ball</FONT></P></TD>
<TD VALIGN="bottom" WIDTH="3%"><FONT FACE="Times New Roman" SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top" WIDTH="50%"> <P STYLE="margin-top:0px;margin-bottom:0px; margin-left:2%; text-indent:-2%"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Director</FONT></P></TD></TR>
<TR>
<TD HEIGHT="24"></TD></TR>
<TR>
<TD VALIGN="top" WIDTH="50%"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/s/&nbsp;&nbsp;&nbsp;&nbsp;TERRENCE P.
DUNN</FONT></P><HR SIZE="1" NOSHADE COLOR="#000000" ALIGN="left"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Terrence P. Dunn</FONT></P></TD>
<TD VALIGN="bottom" WIDTH="3%"><FONT FACE="Times New Roman" SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top" WIDTH="50%"> <P STYLE="margin-top:0px;margin-bottom:0px; margin-left:2%; text-indent:-2%"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Director</FONT></P></TD></TR>
</TABLE><P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P>
<P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">II-2 </FONT></P>


<p Style='page-break-before:always'>
<HR  SIZE="3" COLOR="#999999" WIDTH="100%" ALIGN="CENTER">
<P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P>
<TABLE CELLSPACING="0" CELLPADDING="0" WIDTH="100%" BORDER="0">

<TR>
<TD VALIGN="bottom" WIDTH="50%" ALIGN="center"> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Signature</FONT></P><HR WIDTH="60" SIZE="1" NOSHADE COLOR="#000000"></TD>
<TD VALIGN="bottom" WIDTH="3%"><FONT FACE="Times New Roman" SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom" WIDTH="50%"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Title</FONT></P><HR WIDTH="27" SIZE="1" NOSHADE ALIGN="left" COLOR="#000000"></TD></TR>
<TR>
<TD HEIGHT="16"></TD></TR>
<TR>
<TD VALIGN="top" WIDTH="50%"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/s/&nbsp;&nbsp;&nbsp;&nbsp;VINCENT D.
FOSTER&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT></P><HR SIZE="1" NOSHADE COLOR="#000000" ALIGN="left"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Vincent D. Foster</FONT></P></TD>
<TD VALIGN="bottom" WIDTH="3%"><FONT FACE="Times New Roman" SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top" WIDTH="50%"> <P STYLE="margin-top:0px;margin-bottom:0px; margin-left:2%; text-indent:-2%"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Director</FONT></P></TD></TR>
<TR>
<TD HEIGHT="24"></TD></TR>
<TR>
<TD VALIGN="top" WIDTH="50%"><HR SIZE="1" NOSHADE COLOR="#000000" ALIGN="left"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Louis C. Golm</FONT></P></TD>
<TD VALIGN="bottom" WIDTH="3%"><FONT FACE="Times New Roman" SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top" WIDTH="50%"> <P STYLE="margin-top:0px;margin-bottom:0px; margin-left:2%; text-indent:-2%"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Director</FONT></P></TD></TR>
<TR>
<TD HEIGHT="24"></TD></TR>
<TR>
<TD VALIGN="top" WIDTH="50%"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/s/&nbsp;&nbsp;&nbsp;&nbsp;BEN A.
GUILL&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT></P><HR SIZE="1" NOSHADE COLOR="#000000" ALIGN="left"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Ben A. Guill</FONT></P></TD>
<TD VALIGN="bottom" WIDTH="3%"><FONT FACE="Times New Roman" SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top" WIDTH="50%"> <P STYLE="margin-top:0px;margin-bottom:0px; margin-left:2%; text-indent:-2%"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Director</FONT></P></TD></TR>
<TR>
<TD HEIGHT="24"></TD></TR>
<TR>
<TD VALIGN="top" WIDTH="50%"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/s/&nbsp;&nbsp;&nbsp;&nbsp;GARY A.
TUCCI&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT></P><HR SIZE="1" NOSHADE COLOR="#000000" ALIGN="left"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Gary A.
Tucci</FONT></P></TD>
<TD VALIGN="bottom" WIDTH="3%"><FONT FACE="Times New Roman" SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top" WIDTH="50%"> <P STYLE="margin-top:0px;margin-bottom:0px; margin-left:2%; text-indent:-2%"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Director</FONT></P></TD></TR>
<TR>
<TD HEIGHT="24"></TD></TR>
<TR>
<TD VALIGN="top" WIDTH="50%"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;/s/&nbsp;&nbsp;&nbsp;&nbsp;JOHN R.
WILSON&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT></P><HR SIZE="1" NOSHADE COLOR="#000000" ALIGN="left"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">John R. Wilson</FONT></P></TD>
<TD VALIGN="bottom" WIDTH="3%"><FONT FACE="Times New Roman" SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="top" WIDTH="50%"> <P STYLE="margin-top:0px;margin-bottom:0px; margin-left:2%; text-indent:-2%"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Director</FONT></P></TD></TR>
</TABLE><P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P><P
STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P>
<P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">II-3 </FONT></P>


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<P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">INDEX TO EXHIBITS </FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT
SIZE="1">&nbsp;</FONT></P>
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<TD VALIGN="bottom" ALIGN="center"> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Exhibit Number</FONT></P><HR WIDTH="53" SIZE="1" NOSHADE COLOR="#000000"></TD>
<TD VALIGN="bottom" WIDTH="3%"><FONT FACE="Times New Roman" SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom" WIDTH="92%"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Exhibit</FONT></P><HR WIDTH="43" SIZE="1" NOSHADE ALIGN="left" COLOR="#000000"></TD></TR>
<TR>
<TD HEIGHT="5"></TD></TR>
<TR>
<TD VALIGN="top" ALIGN="right" WIDTH="7%"> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="right"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">5.1</FONT></P></TD>
<TD VALIGN="bottom" WIDTH="3%"><FONT FACE="Times New Roman" SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom" WIDTH="92%"> <P STYLE="margin-top:0px;margin-bottom:0px; margin-left:2%; text-indent:-2%"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Opinion of Gardere Wynne Sewell LLP</FONT></P></TD></TR>
<TR>
<TD HEIGHT="5"></TD></TR>
<TR>
<TD VALIGN="top" ALIGN="right" WIDTH="7%"> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="right"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">*23.1</FONT></P></TD>
<TD VALIGN="bottom" WIDTH="3%"><FONT FACE="Times New Roman" SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom" WIDTH="92%"> <P STYLE="margin-top:0px;margin-bottom:0px; margin-left:2%; text-indent:-2%"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Consent of Arthur Andersen LLP (omitted pursuant to Rule 437a)</FONT></P></TD></TR>
<TR>
<TD HEIGHT="5"></TD></TR>
<TR>
<TD VALIGN="top" ALIGN="right" WIDTH="7%"> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="right"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">23.2</FONT></P></TD>
<TD VALIGN="bottom" WIDTH="3%"><FONT FACE="Times New Roman" SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom" WIDTH="92%"> <P STYLE="margin-top:0px;margin-bottom:0px; margin-left:2%; text-indent:-2%"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Consent of Gardere Wynne Sewell LLP (included as part of Exhibit
5.1)</FONT></P></TD></TR>
<TR>
<TD HEIGHT="5"></TD></TR>
<TR>
<TD VALIGN="top" ALIGN="right" WIDTH="7%"> <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="right"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">24.1</FONT></P></TD>
<TD VALIGN="bottom" WIDTH="3%"><FONT FACE="Times New Roman" SIZE="1">&nbsp;&nbsp;</FONT></TD>
<TD VALIGN="bottom" WIDTH="92%"> <P STYLE="margin-top:0px;margin-bottom:0px; margin-left:2%; text-indent:-2%"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Power of Attorney (set forth on the signature page of the Registration
Statement)</FONT></P></TD></TR>
</TABLE><P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P><HR WIDTH="17%" SIZE="1" NOSHADE COLOR="#000000" ALIGN="left"><P STYLE="margin-top:0px;margin-bottom:0px"><FONT
FACE="Times New Roman" SIZE="2" COLOR="#000000">* After reasonable efforts, the Registrant is unable to obtain the consent of Arthur Andersen LLP in the incorporation in this Registration Statement of its report with respect to the Registrant&#146;s
consolidated financial statements, which appeared in the Registrant&#146;s Annual Report on Form 10-K for the year ended December 31, 2001. Under these circumstances, Rule 437a under the Securities Act permits this Registration Statement to be filed
without the written consent from Arthur Andersen LLP. As a result, participants eligible to obtain Common Stock under the Plan registered hereby may not be able to recover damages from Arthur Andersen LLP under Section 11 of the Securities Act, for
any untrue statement of a material fact or any omission to state a material fact, contained in the Registrant&#146;s consolidated financial statements for the year ended December 31, 2001. </FONT></P>
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<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>3
<FILENAME>dex51.htm
<DESCRIPTION>OPINION
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<TITLE>Opinion</TITLE>
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<P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="right"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">EXHIBIT 5.1 </FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT
SIZE="1">&nbsp;</FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">[Gardere Logo] </FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P><P
STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Direct: 214-999-4654 </FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Direct Fax: 214-999-3654
</FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">medwards@gardere.com </FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P><P
STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">March 3, 2003 </FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT
FACE="Times New Roman" SIZE="2" COLOR="#000000">Quanta Services, Inc. </FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">1360 Post Oak Boulevard </FONT></P><P
STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Suite 2100 </FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Houston, Texas 77056 </FONT></P><P
STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Re:&nbsp;&nbsp;&nbsp;&nbsp;Quanta Services, Inc. 2001 Stock Incentive Plan
</FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Ladies and Gentlemen: </FONT></P><P
STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">We have acted as counsel to Quanta Services, Inc., a Delaware corporation (the
&#147;Company&#148;), and are issuing this opinion in connection with the registration under the Securities Act of 1933, as amended (the &#147;Securities Act&#148;), on Form S-8 (the &#147;Registration Statement&#148;) of an additional 9,839,668
shares of Common Stock, $0.00001 par value (the &#147;Shares&#148;), of the Company issuable under the Quanta Services, Inc. 2001 Stock Incentive Plan (the &#147;Plan&#148;). </FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT
SIZE="1">&nbsp;</FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">With respect to the foregoing, we have examined and have relied upon originals or copies, certified or otherwise identified
to our satisfaction, of such corporate records, documents, orders, certificates and other instruments as in our judgment are necessary or appropriate to enable us to render the opinion expressed below. </FONT></P><P
STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">The opinions expressed herein are limited in all respects to the federal laws
of the United States of America and the General Corporation Law of the State of Delaware, and no opinion is expressed with respect to the laws of any other jurisdiction or any effect that such laws may have on the opinions expressed herein. This
opinion is limited to the matters stated herein, and no opinion is implied or may be inferred beyond the matters expressly stated herein. </FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P><P
STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Based upon the foregoing, we are of the opinion that (i) the Shares are duly authorized; and (ii) upon the issuance of the Shares against payment therefor
of an amount equal to at least the par value of each Share in accordance with the Plan, the Shares will be validly issued, fully paid and non-assessable. This opinion is given as of the date hereof, and we assume no obligation to update this opinion
to reflect any fact or circumstance that may hereafter come to our attention or any change in law or regulation that may hereafter occur. </FONT></P>

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<P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Quanta Service, Inc. </FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman"
SIZE="2" COLOR="#000000">March 3, 2003 </FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2" COLOR="#000000">Page 2 </FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2"
COLOR="#000000">We hereby consent to the use of this opinion as Exhibit 5.1 to the Registration Statement. In giving this consent, we do not thereby admit that we are in the category of persons whose consent is required under Section 7 of the
Securities Act and the rules and regulations of the Securities and Exchange Commission thereunder. </FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT
FACE="Times New Roman" SIZE="2" COLOR="#000000">Very truly yours, </FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2"
COLOR="#000000">GARDERE WYNNE SEWELL LLP </FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P><P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2"
COLOR="#000000">By:&nbsp;&nbsp;&nbsp;&nbsp; /s/ T. MARK EDWARDS </FONT></P><HR WIDTH="35%" SIZE="1" NOSHADE COLOR="#000000" ALIGN="left"><P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2"
COLOR="#000000">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;T. Mark Edwards, Partner </FONT></P>
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