SUBSIDIARIES

EXHIBIT 21.1


STATE OF
SUBSIDIARY INCORPORATION
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Advanced Technologies and Installation Washington
Corporation
Airlan Telecom Services, L.P. Texas
Allteck Line Contractors (USA), Inc. Washington
Allteck Line Contractors, Inc. British Columbia
Arby Construction, Inc. Delaware
Austin Trencher, Inc. Delaware
Bradford Brothers, Inc. North Carolina
Brown Engineering, LLC Delaware
CCLC, Inc. Delaware
Coast to Coast, LLC California
Communication Manpower, Inc. Florida
Conti Communications, Inc. Delaware
Croce Electric Company, Inc. Delaware
Crown Fiber Communications, Inc. Virginia
Choice Optics Communications
DeltaComm
Fiber Technology
Marlboro Cablevision
World Fiber
Digco Utility Construction, L.P. Texas
Dillard Smith Construction Company Delaware
Dot 05, LLC Delaware
Driftwood Electrical Contractors, Inc. Delaware
Maddux Communications
Environmental Professional Associates, Limited California
Provco
Five Points Construction Co. Texas
Global Enercom Management, Inc. Delaware
Golden State Utility Co. Delaware
H.L. Chapman Pipeline Construction, Inc. Delaware
DB Utilities
Haines Construction Company Delaware
Intermountain Electric, Inc. Colorado
Grand Electric
Irby Construction Company Mississippi
Lake Norman Pipeline, LLC North Carolina
Lindsey Electric, L.P. Texas
Line Equipment Sales Co., Inc. South Carolina
Manuel Bros., Inc. Delaware
Renaissance Construction
Western Directional
Mears Canada Corp. Nova Scotia
Mears Engineering, LLC Michigan
Mears Group, Inc. Delaware
Mears Services, LLC Michigan
Mears/CPG, LLC Michigan

1
STATE OF
SUBSIDIARY INCORPORATION
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Mears/HDD, LLC Michigan
Mearsmex de R.L. de C.V. Mexico
Mejia Personnel Services, Inc. Texas
Metro Underground Services, Inc. Illinois
Network Electric Company Delaware
North Houston Pole Line, L.P. Texas
North Houston Pole Line Corp.
North Pacific Construction Co., Inc. Delaware
North Sky Communications, Inc. Delaware
Northern Line Layers, LLC Delaware
Okay Construction Company, LLC Delaware
P.D.G. Electric Co. Florida
PAR Electrical Contractors, Inc. Missouri
Harker & Harker
Par Infrared Consultants
Riggin & Diggin Line Construction
Union Power Construction Company
Parkside Site and Utility Company Corporation Delaware
Parkside Utility Construction Corp. Delaware
Potelco, Inc. Washington
Kingston Constructors
Kingston Constructors DBA Talking Signs
Services
Kuenzi Construction
NorAm Telecommunications
Professional Teleconcepts, Inc. Illinois
Professional Teleconcepts, Inc. New York
PWR Financial Company Delaware
PWR Network, LLC Delaware
Q Resources, LLC Delaware
QDE LLC Delaware
QPC, Inc. Delaware
QSI, Inc. Delaware
Quanta Asset Management LLC Delaware
Quanta Associates, L.P. Texas
Quanta Delaware, Inc. Delaware
Quanta Holdings, Inc. Delaware
Quanta LI Acquisition, Inc. Delaware
Quanta LIV Acquisition, Inc. Delaware
Quanta LIX Acquisition, Inc. Delaware
Quanta LVII Acquisition, Inc. Delaware
Quanta LVIII Acquisition, Inc. Delaware
Quanta LX Acquisition, Inc. Delaware
Quanta LXI Acquisition, Inc. Delaware
Quanta LXII Acquisition, Inc. Delaware
Quanta LXIII Acquisition, Inc. Delaware
Quanta LXIV Acquisition, Inc. Delaware
Quanta LXIX Acquisition, Inc. Delaware
Quanta LXV Acquisition, Inc. Delaware
Quanta LXVI Acquisition, Inc. Delaware

2
STATE OF
SUBSIDIARY INCORPORATION
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Quanta LXVII Acquisition, Inc. Delaware
Quanta LXVIII Acquisition, Inc. Delaware
Quanta LXX Acquisition, Inc. Delaware
Quanta LXXI Acquisition, Inc. Delaware
Quanta LXXII Acquisition, Inc. Delaware
Quanta LXXIII Acquisition, Inc. Delaware
Quanta XXXI Acquisition, Inc. Delaware
Quanta Receivables, L.P. Delaware
Quanta Services Management Partnership, L.P. Texas
Quanta Services of Canada Ltd. British Columbia
Quanta Utility Installation Co., Inc. Delaware
R.A. Waffensmith & Co., Inc. Delaware
Ranger Field Services, Inc. Delaware
Brown Engineering & Testing
S.K.S. Pipeliners, LLC Delaware
Seaward Corporation Maine
Interstate Equipment Corporation
Southeast Pipeline Construction, Inc. Delaware
Southwestern Communications, Inc. Delaware
NetCom Management Group, Inc.
TVS Systems
Spalj Construction Company Delaware
Dot 05 Optical Communications
Span-Con of Deerwood
Tjader & Highstrom
Wilson Roadbores
Sumter Utilities, Inc. Delaware
The Ryan Company, Inc. Massachusetts
Eastern Communications
Tjader, L.L.C. Delaware
TNS-VA, LLC Delaware
Tom Allen Construction Company Delaware
Trans Tech Acquisition, Inc. Texas
Trans Tech Electric, L.P. Texas
Trawick Construction Co. Florida
TTGP, Inc. Delaware
TTLP, Inc. Delaware
TTM, Inc. North Carolina
TXLP, Inc. Delaware
Underground Construction Co., Inc. Delaware
Utilco, Inc. Georgia
VCI Telcom, Inc. Delaware
W. C. Communications, Inc. Delaware
W.H.O.M. Corporation California

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