Licensed Contractors in Ontario, California

Ontario has 908 licensed contractors registered with the California Contractors State License Board across 66 trade classifications. The most common specialties are Electrical Contractor (128), Painting and Decorating Contractor (54), Plumbing Contractor (49). 408 contractors hold general contractor licenses (Class A or B).

All license data is sourced from the California Contractors State License Board (CSLB). Last data update: February 20, 2026.

Contractors by Classification

General Contractors

B: General Building Contractor (341) A: General Engineering Contractor (63) B-2: Residential Remodeling Contractor (4)

Specialty Contractors

Show all 63 specialty classifications

Gregg Electric Inc Active
License #201042 A, C-10 +1 more Ontario, CA Est. 1961
Airite Heating And Air Conditioning Inc Active
License #232930 C-4, C-20 +1 more Ontario, CA Est. 1965
Magnison And Moen Inc Active
License #264898 C-20 Ontario, CA Est. 1970
Rudolf Carl Theilacker Contractor Active
License #279711 A, B Ontario, CA Est. 1972
General Outdoor Advertising Active
License #292643 D42 Ontario, CA Est. 1974
James Dekoker Electrical Contractor Active
License #300802 C-10 Ontario, CA Est. 1974
Fullmer Construction Active
License #301814 B Ontario, CA Est. 1975
C P Construction Co Inc Active
License #304795 A, C-12 +2 more Ontario, CA Est. 1975
Ontario Refrigeration Commercial Air Conditioning Heating & Contr Active
License #315638 C-20, C-38 Ontario, CA Est. 1976
K & Z Cabinet Co Inc Active
License #319196 C-6 Ontario, CA Est. 1976
Mc Ginnis Custom Plastics Active
License #326086 D12 Ontario, CA Est. 1976
Thomas Anderson Wallcovering Inc Active
License #336082 C-33 Ontario, CA Est. 1977
R A Darracq Concrete Active
License #351727 C-8 Ontario, CA Est. 1978
Steve Crossman Active
License #362535 B, C-6 Ontario, CA Est. 1978
Paul B Hofer Iii Active
License #368051 B Ontario, CA Est. 1979
Pascal & Ludwig Constructors Inc Active
License #373525 A, B +1 more Ontario, CA Est. 1979
Terral Dunn Active
License #378323 C-7 Ontario, CA Est. 1979
A C Spraggins Engineering & Underground Inc Active
License #383440 A Ontario, CA Est. 1979
Metal Engineering & Mfg Active
License #409730 C-43 Ontario, CA Est. 1981
Cano Architecture Concrete Repair Active
License #414320 B, C-8 Ontario, CA Est. 1981
Baywood Construction Co Active
License #415687 B Ontario, CA Est. 1981
Spec Construction Co Inc Active
License #419626 A, B +11 more Ontario, CA Est. 1982
Premier Pools And Spas Active
License #430551 C-27, C-53 Ontario, CA Est. 1982
Packs Construction Active
License #453095 B, C-7 Ontario, CA Est. 1984
Anton Construction Active
License #461541 A, B Ontario, CA Est. 1984
Andrade Painting & Decorating Active
License #462142 C-33 Ontario, CA Est. 1984
Ajb Concrete & Masonry Construction Active
License #463690 C-8, C-29 Ontario, CA Est. 1984
Mark Ligtenberg Active
License #464429 C-10 Ontario, CA Est. 1984
Larry Methvin Installations Inc Dba Lmi Active
License #471010 C-17, D24 +1 more Ontario, CA Est. 1985
Swan Painting Active
License #476019 C-33 Ontario, CA Est. 1985
Craig E Holbrook Active
License #478551 B Ontario, CA Est. 1985
Upland Contracting Inc Active
License #481317 C-50 Ontario, CA Est. 1985
Rossetti Construction Company Inc Active
License #481575 B Ontario, CA Est. 1985
Correa Construction Active
License #482342 B, C-8 Ontario, CA Est. 1985
Stone Creations Incorporated Active
License #494256 D12 Ontario, CA Est. 1986
Shamrock Landscape & Maintenance Active
License #496215 C-27 Ontario, CA Est. 1986
M & R Construction Services Inc Active
License #508404 B, C-8 +2 more Ontario, CA Est. 1987
G & G Plumbing Active
License #508994 C-36 Ontario, CA Est. 1987
Gregory Alan Haydel Active
License #509362 C-6 Ontario, CA Est. 1987
Mike Walsh Dba A-C Power Systems Active
License #514277 C-10 Ontario, CA Est. 1987
Triple H Plastering Incorporated Active
License #517157 C-35 Ontario, CA Est. 1987
R B M Lock & Key Service Active
License #517474 C-28, D16 +1 more Ontario, CA Est. 1987
Robert Edward Temple Active
License #519817 C-33 Ontario, CA Est. 1987
Turnbow Electrical Services Active
License #525216 C-10 Ontario, CA Est. 1988
Sign City Active
License #527455 C-45 Ontario, CA Est. 1988
P V & C Plumbing And Piping Inc Active
License #529259 C-36 Ontario, CA Est. 1988
Klaus Norbert Kraemer Active
License #529570 B Ontario, CA Est. 1988
Cgo Construction Company Inc Active
License #532200 A, C-21 Ontario, CA Est. 1988
New Constructon Active
License #532419 B Ontario, CA Est. 1988
Hostetler Construction Active
License #532843 B Ontario, CA Est. 1988

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