Exhibit 21.1
QUANTA SERVICES, INC. — SUBSIDIARIES LIST
The following is a list of the significant subsidiaries of Quanta Services, Inc. showing the place of incorporation or organization and the names under which each subsidiary does business. The names of certain subsidiaries are omitted as such subsidiaries, considered as a single subsidiary, would not constitute a significant subsidiary.
     
Subsidiary/Doing Business As   State of Incorporation/Organization
Advanced Technologies and Installation Corporation
   Washington
Telecom Network Specialist
    
Allteck Line Contractors (USA), Inc.
   Washington
Allteck Line Contractors, Inc.
   British Columbia
Austin Trencher, Inc.
   Delaware
Blair Park Services, LLC
   Delaware
Blair Park Services, LLC of Delaware
    
InfraSource Blair Park Services, LLC
    
Bradford Brothers, Incorporated
   North Carolina
BBI Bradford Brothers, Incorporated
    
Bradford Brothers, Inc.
    
Quanta Underground Services
    
Quanta Underground Services, Inc.
    
Quanta Underground
    
CCLC, Inc.
   Delaware
CMI Services, Inc.
   Florida
Florida CMI Services, Inc.
    
FL CMI Services, Inc.
    
CAN-FER Construction Company
   Texas
Conti Communications, Inc.
   Delaware
DE Conti Communications, Inc.
    
Croce Electric Company, Inc.
   Delaware
Dacon California
   California
Dacon, LLC
   Delaware
Dashiell California, Inc.
   California
Dashiell, LLC
   Delaware
Dashiell (DE), LLC
    
Digco Utility Construction, L.P.
   Delaware
Brown Engineering
    
Ranger Field Services
    
Dillard Smith Construction Company
   Delaware
E A Technical Services, Inc.
   Georgia
EHV Elecon, Inc.
   Puerto Rico
EHV Power ULC
   Alberta
Engineering Associates, Inc.
   Georgia
Five Points Construction Co.
   Texas
Global Enercom Management, Inc.
   Delaware
Golden State Utility Co.
   Delaware
H.L. Chapman Pipeline Construction, Inc.
   Delaware
DB Utilities
    
Chapman Pipeline Construction, Inc., H.L.
    
Sullivan Welding
    
InfraSource Corporate Services, LLC
   Delaware
InfraSource Company Services, LLC
    
Quanta Technology
    
InfraSource Incorporated
   Delaware
InfraSource Maslonka CA, Inc.
   California
InfraSource-Maslonka, LLC
   Delaware
InfraSource Power California, Inc.
   California
InfraSource Services, Inc.
   Delaware
InfraSource Telecommunication Services, LLC
   Delaware
InfraSource Transmission Services Company
   Arizona
InfraSource Underground Construction, Inc.
   Delaware
IUC Michigan, Inc.
    

 

 

     
Subsidiary/Doing Business As   State of Incorporation/Organization
IUC Texas, Inc.
    
InfraSource Underground Construction, LLC
   Delaware
IUC Illinois, LLC
    
IUC Missouri, LLC
    
IUC Montana, LLC
    
IUC Nebraska, LLC
    
IUC North Dakota, LLC
    
IUC Washington, LLC
    
IUS Wisconsin, LLC
    
InfraSource Underground Construction California, Inc.
   Delaware
InfraSource Underground Construction Services, LLC
   Delaware
InfraSource Underground Installation, LLC
   Delaware
InfraSource Underground Services, LLC
   Georgia
IUS Underground, LLC
    
InfraSource Underground Services Canada, Inc.
   Delaware
Intermountain Electric, Inc.
   Colorado
Colorado IM Electric
    
Grand Electric
    
Irby Construction Company
   Mississippi
Lindsey Electric, L.P.
   Texas
Manuel Bros., Inc.
   Delaware
Renaissance Construction
    
Western Directional
    
Mechanical Specialties, Inc.
   Virginia
Mears Canada Corp.
   Nova Scotia
Mears Engineering/LLC
   Michigan
Mears Group, Inc.
   Delaware
Mears Services LLC
   Michigan
Mears/CPG LLC
   Michigan
Mears/HDD, LLC
   Michigan
Mearsmex S. de R.L. de C.V.
   Mexico
Mejia Personnel Services, Inc.
   Texas
Metro Underground Services, Inc. of Illinois
   Illinois
M.J. Electric, LLC
   Delaware
M.J. Electric, LLC Iron Mountain
    
M.J. Electric, Iron Mountain
    
InfraSource M.J. Electric, LLC
    
Iron Mountain M.J. Electric, LLC
    
M.J. Electric California, Inc.
   California
Network Electric Company
   Delaware
North Houston Pole Line, L.P.
   Delaware
North Sky Communications, Inc.
   Delaware
Sky Communications
    
Okay Construction Company, LLC
   Delaware
OSP Consultants, Inc.
   Virginia
PAR Electrical Contractors, Inc.
   Missouri
Computapole
    
Longfellow Drilling
    
Longfellow Drilling, Inc.
    
Riggin & Diggin Line Construction
    
Seaward
    
Seaward Corporation
    
PAR Internacional, S. de R.L. de C.V.
   Mexico
Parkside Site & Utility Company Corporation
   Delaware
Parkside Utility Construction Corp.
   Delaware
Pauley Construction Inc.
   Arizona
Potelco, Inc.
   Washington
Kingston Constructors
    
Kuenzi Construction
    
NorAm Telecommunications
    
Professional Teleconcepts, Inc.
   Illinois
Professional Teleconcepts of Illinois
    
Professional Teleconcepts, Inc.
   New York
Professional Teleconcepts of New York
    

 

 

     
Subsidiary/Doing Business As   State of Incorporation/Organization
NY Professional Teleconcepts
    
NY Professional Teleconcepts, Inc.
    
PWR Financial Company
   Delaware
PWR Network, 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 Government Services, Inc.
   Delaware
Quanta Government Solutions, Inc.
   Delaware
Quanta International Limited
   British Virgin Islands
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 LXV Acquisition, Inc.
   Delaware
Quanta LXVI Acquisition, Inc.
   Delaware
Quanta LXVII Acquisition, Inc.
   Delaware
Quanta LXVIII Acquisition, Inc.
   Delaware
Quanta LXIX Acquisition, Inc.
   Delaware
Quanta LXX Acquisition, Inc.
   Delaware
Quanta LXXI Acquisition, Inc.
   Delaware
Quanta LXXII Acquisition, Inc.
   Delaware
Quanta LXXIII Acquisition, Inc
   Delaware
Quanta Receivables, L.P.
   Delaware
Quanta Services Contracting, Inc.
   Delaware
Quanta Services Management Partnership, L.P.
   Texas
Quanta Services of Canada Ltd.
   British Columbia
Quanta Technology, LLC
   Delaware
Quanta Underground Services, Inc.
   Delaware
Quanta Utility Installation Company, Inc.
   Delaware
Quanta Utility Services — Gulf States, Inc.
   Delaware
Quanta Utility Services, LLC
   Delaware
Quanta Wireless Solutions, Inc.
   Delaware
QuantaWorks, LLC
   Delaware
R.A. Waffensmith & Co., Inc.
   Delaware
Realtime Engineers, Inc.
   Delaware
Realtime Utility Engineers, Inc.
   Wisconsin
Servicios Par Electric, S. de R.L. de C.V.
   Mexico
Southwest Trenching Company, Inc.
   Texas
Spalj Construction Company
   Delaware
Delaware Spalj Construction
    
Dot 05 Optical Communications
    
Driftwood Electrical Contractors
    
Fiber Technologies
    
Smith Contracting
    
Span-Con of Deerwood
    
Tjader & Highstrom
    
Thorstad Brother Tiling
    
Wilson Roadbores
    
Spectrum Construction Contracting, L.L.C.
   Colorado
Spectrum Builders
    
Sumter Utilities, Inc.
   Delaware
Sunesys, LLC
   Delaware
Sunesys, LLC of Delaware
    
Sunesys of Massachusetts, LLC
   Delaware
Sunesys of Virginia, Inc.
   Virginia
The Ryan Company, Inc.
   Massachusetts
Eastern Communications
    
The Ryan Company Inc. of Massachusetts
    
The Ryan Company of Massachusetts
    

 

 

     
Subsidiary/Doing Business As   State of Incorporation/Organization
The Ryan Company Incorporated of Massachusetts
    
The Ryan Company Incorporated Electrical Contractors
    
Ryan Company Inc. (The)
    
Tjader, L.L.C.
   Delaware
Tom Allen Construction Company
   Delaware
TA Construction
    
Allen Construction Company, Tom
    
Total Quality Management Services, LLC
   Delaware
Trawick Construction Company, Inc.
   Florida
TTGP, Inc.
   Delaware
TTLP, Inc.
   Delaware
Underground Construction Co., Inc.
   Delaware
Delaware Underground Construction Co.
    
Maryland Underground Construction Co., Inc.
    
Underground Construction Co., Inc. (Delaware)
    
Utility Line Management Services, Inc.
   Delaware
Utility Locate & Mapping Services, Inc.
   Virginia
VCI Telcom, Inc.
   Delaware
VCS Sub, Inc.
   California
W.C. Communications, Inc.
   Delaware
West Coast Communications
    
Winco, Inc.
   Oregon
Winco Powerline Services, Inc.
    
Winco Powerline Services