Licensed Contractors in Ontario, California
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
C-10: Electrical Contractor
(128)
C-33: Painting and Decorating Contractor
(54)
C-36: Plumbing Contractor
(49)
C-20: Warm-Air Heating, Ventilating and Air-Conditioning (HVAC) Contractor
(46)
C-7: Low Voltage Systems Contractor
(37)
C-27: Landscaping Contractor
(34)
C-8: Concrete Contractor
(29)
C-15: Flooring and Floor Covering Contractor
(29)
C-39: Roofing Contractor
(26)
D28: Doors, Gates and Activating Devices
(22)
Signs Of Success
Active
License #533178
C-45
Ontario, CA
Est. 1988
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
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
License #585965
B
Ontario, CA
Est. 1990
License #587709
B, C-10 +2 more
Ontario, CA
Est. 1990
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
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
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
License #622252
B
Ontario, CA
Est. 1991
Alberto Garcia Contractor
Active
License #624340
B, C-10 +1 more
Ontario, CA
Est. 1991
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
Art D'S Concrete Company Inc
Active
License #639805
B, C-8
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
Robcorp Construction Inc
Active
License #649014
C-12
Ontario, CA
Est. 1992
License #653080
C-32, C-33 +1 more
Ontario, CA
Est. 1992