Licensed Contractors in Ontario, California

All license data is sourced from the California Contractors State License Board (CSLB). Last data update: April 05, 2026.

Contractors by Trade

Building (456)
Electrical (166)
Limited (119)
Painting (108)
HVAC (63)
Roofing (63)
Plumbing (61)
Earthwork (55)
Landscaping (49)
Welding (30)
Fire (28)
Solar (3)
Island Construction & Maintenance Active
License #667042 B, C-10 +2 more Ontario, CA Est. 1993
Rodriguez Brothers Engineering Inc Active
License #670969 A, C-42 Ontario, CA Est. 1993
Marco A Yanez Active
License #673547 C-10 Ontario, CA Est. 1993
Joseph Construction Active
License #674654 B Ontario, CA Est. 1993
C M Construction General Contractors Inc Active
License #677379 B Ontario, CA Est. 1993
Sierra Construction Active
License #681123 B Ontario, CA Est. 1993
J L G Construction Active
License #683195 B Ontario, CA Est. 1993
Espinoza Roofing Active
License #686396 C-39 Ontario, CA Est. 1994
Eric Castaneda Active
License #687603 B Ontario, CA Est. 1994
Chava'S Marble & Tile Active
License #692159 B, C-54 Ontario, CA Est. 1994
Dong Suk Suh Dba Seasons Painting & Construction Co Active
License #692214 A, B +1 more Ontario, CA Est. 1994
Bill Marino Active
License #696015 C-39 Ontario, CA Est. 1994
Perfect Construction Co Active
License #696650 B Ontario, CA Est. 1994
Ho Soo Yoo Active
License #703553 B, C-10 +2 more Ontario, CA Est. 1995
Castillon Flooring Contractor Active
License #704444 C-15 Ontario, CA Est. 1995
Cornerstone Carpentry Active
License #707735 C-6 Ontario, CA Est. 1995
Martinez Steel Corporation Active
License #708227 C-50 Ontario, CA Est. 1995
All Trade Decking Active
License #708790 D12, D41 Ontario, CA Est. 1995
Holmes Pool Service Active
License #709386 D35 Ontario, CA Est. 1995
Amilcar M Castillo Active
License #711675 B Ontario, CA Est. 1995
Warren Collins And Associates Inc Dba Collins Company Active
License #715532 D03, D64 Ontario, CA Est. 1995
Anna Earley Dba Epoxy Construction Services Active
License #721740 D12 Ontario, CA Est. 1996
California Door Doc Active
License #723866 D28 Ontario, CA Est. 1996
Wavcomm Active
License #724434 B, C-10 Ontario, CA Est. 1996
Edward Ruiz Active
License #726100 C-15 Ontario, CA Est. 1996
Clark General Contracting Inc Active
License #726205 B, C-23 Ontario, CA Est. 1996
All - Right Roofing Llc Active
License #726974 C-39 Ontario, CA Est. 1996
Richard Joe Saenz Active
License #727122 B Ontario, CA Est. 1996
Ics Intelesys Inc Active
License #729063 C-7 Ontario, CA Est. 1996
Belanger Electrical Services Active
License #729646 C-10 Ontario, CA Est. 1996
Rodney Glenn Wolcott Active
License #730955 C-10 Ontario, CA Est. 1997
Michael Anthony Painting Active
License #731128 C-33 Ontario, CA Est. 1997
David Leung Active
License #731215 B, C-15 Ontario, CA Est. 1997
Best Value Solar Energy Systems Active
License #733942 C-46 Ontario, CA Est. 1997
B Fries Construction Inc Active
License #735157 B Ontario, CA Est. 1997
Signature Signs Active
License #737465 C-45 Ontario, CA Est. 1997
Diversifab Inc Active
License #740419 D64 Ontario, CA Est. 1997
Regal Industries Inc Active
License #740801 C-33, D12 Ontario, CA Est. 1997
J S Painting Co Active
License #741595 C-33 Ontario, CA Est. 1997
Material Flow Systems Inc Active
License #741699 D21 Ontario, CA Est. 1997
Thor Mc Andrew Construction Active
License #742776 B Ontario, CA Est. 1997
Lytle Landscape Construction Active
License #743494 C-27 Ontario, CA Est. 1997
Alliance Communication Services Inc Active
License #746796 B, C-7 Ontario, CA Est. 1998
Tom Arriola Flooring Active
License #747719 C-15 Ontario, CA Est. 1998
Rico Painting Active
License #750696 C-33 Ontario, CA Est. 1998
Vertex Coatings Inc Active
License #756237 C-33 Ontario, CA Est. 1998
Cash Grading Contractors Inc Active
License #756412 A Ontario, CA Est. 1998
R3 Painting Active
License #757555 B, C-33 Ontario, CA Est. 1998
Lassiter Construction Active
License #758267 B Ontario, CA Est. 1999
Empire Sheet Metal Inc Active
License #759685 C-43 Ontario, CA Est. 1999

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Licensing Resources

How to verify a contractor license
Deposit and payment rules for California contracts
Home improvement contract requirements

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