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)
J & S Striping Company Inc Active
License #538211 C-32 Ontario, CA Est. 1988
Abc Resources Inc Active
License #538680 A, C-12 +1 more Ontario, CA Est. 1988
J M L Electric Active
License #539099 C-10 Ontario, CA Est. 1988
Rdm Electric Co Inc Active
License #539194 C-10 Ontario, CA Est. 1988
Otto Ernesto Barrera Active
License #540960 B Ontario, CA Est. 1988
Western Deck And Steel Erection Dba Western Metal Deck Active
License #550219 C-51 Ontario, CA Est. 1988
Jorcast Enterprises Inc Active
License #559980 B Ontario, CA Est. 1989
Rancho Loma Floors Inc Active
License #562032 C-15, C-54 Ontario, CA Est. 1989
Choice Painting Co Active
License #565202 C-33 Ontario, CA Est. 1989
Struct-Tech Builders Active
License #568920 B Ontario, CA Est. 1989
Pacific Rebar Inc Active
License #570671 C-50 Ontario, CA Est. 1989
Chino Valley Refrigeration Active
License #570810 C-10, C-38 Ontario, CA Est. 1989
Air Control Specialties Inc Active
License #570881 C-20 Ontario, CA Est. 1989
Timothy F Herwehe Active
License #576432 C-50 Ontario, CA Est. 1989
Coastline Outdoor Solutions Active
License #581970 C-8, C-27 Ontario, CA Est. 1989
Perera Construction & Design Inc Active
License #585965 B Ontario, CA Est. 1990
Inter-City Energy Systems Inc Active
License #587709 B, C-10 +2 more Ontario, CA Est. 1990
The Mc Intyre Company A Calif Partnership Active
License #590332 C-51 Ontario, CA Est. 1990
Herron Construction Inc Active
License #592387 B Ontario, CA Est. 1990
K A R Construction Inc Active
License #595709 B, C-8 Ontario, CA Est. 1990
Doja Inc Active
License #597764 A, B +3 more Ontario, CA Est. 1990
Comtract Communications Inc Active
License #598482 B, C-7 Ontario, CA Est. 1990
B Z B Construction Company Active
License #599680 B Ontario, CA Est. 1990
Parkcrest Construction Inc Active
License #600254 B Ontario, CA Est. 1990
E A Plumbing Inc Active
License #603170 C-36 Ontario, CA Est. 1990
Fairchild Plumbing & Mechanical Inc Active
License #606705 A, C-16 +1 more Ontario, CA Est. 1990
Ace Engineering Inc Active
License #613320 A, ASB +2 more Ontario, CA Est. 1991
Aljohn Builders Active
License #616383 B Ontario, CA Est. 1991
Master Building Specialties Inc Active
License #616533 D34 Ontario, CA Est. 1991
Jesse Morales & Sons Active
License #618714 C-35, C-53 Ontario, CA Est. 1991
Lloyd Electric Active
License #622258 C-10 Ontario, CA Est. 1991
The East Los Angeles Community Union Active
License #622252 B Ontario, CA Est. 1991
Alberto Garcia Contractor Active
License #624340 B, C-10 +1 more Ontario, CA Est. 1991
B & M Roofing Stripping Services Active
License #626422 C-39 Ontario, CA Est. 1991
Louis Joseph Enriquez Active
License #627102 B Ontario, CA Est. 1991
Custom Construction Active
License #630203 B, C-39 Ontario, CA Est. 1991
Mark Alan Gilbertson Active
License #630410 C-54 Ontario, CA Est. 1991
Advanco Fire Protection Inc Active
License #631600 C-16, C-34 Ontario, CA Est. 1991
D M Gorder Construction Co Active
License #632348 B, C-36 +1 more Ontario, CA Est. 1991
Glenn Kraus Fabrication Active
License #637291 C-51, C-60 Ontario, CA Est. 1992
Premier Paving Inc Active
License #638301 A, C-12 Ontario, CA Est. 1992
Ideal Products Inc Active
License #638386 D24 Ontario, CA Est. 1992
Emmons Roof Service Inc Active
License #638856 C-39 Ontario, CA Est. 1992
Air Control Systems Inc Active
License #639003 C-2, C-20 Ontario, CA Est. 1992
Audrey Roberds Landscaping Active
License #642882 C-27 Ontario, CA Est. 1992
Jocael Palomino Active
License #644395 B Ontario, CA Est. 1992
Trinity Coatings & Hwy Maintenance Active
License #653080 C-32, C-33 +1 more Ontario, CA Est. 1992
R J P General Contracting Active
License #659596 B Ontario, CA Est. 1992
Spicer Construction Active
License #662772 B Ontario, CA Est. 1993
Valley Carpets Active
License #663198 C-15 Ontario, CA Est. 1993

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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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