EXHIBIT 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
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     We hereby consent to the incorporation by reference in this Post-Effective Amendment No. 1 to Registration Statement on Form S-3 of our report dated March 10, 2004 relating to the consolidated financial statements, which appears in Quanta Services, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2003. We also consent to the reference to us under the heading “Experts” in such Post-Effective Amendment No. 1 to Registration Statement.

/s/ PricewaterhouseCoopers LLP

PricewaterhouseCoopers LLP
Houston, Texas
August 30, 2004