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)
License #988985
D12
Ontario, CA
Est. 2013
License #989000
C-10
Ontario, CA
Est. 2013
License #990645
ASB, C-21 +2 more
Ontario, CA
Est. 2014
Airtong Heating & Cooling
Active
License #991016
C-20
Ontario, CA
Est. 2014
License #991737
B, C-10
Ontario, CA
Est. 2014
License #994024
D35
Ontario, CA
Est. 2014
Dgi Structures Inc
Active
License #994472
B
Ontario, CA
Est. 2014
Opti - Comm Technologies
Active
License #995078
C-7, C-10
Ontario, CA
Est. 2014
Moonlite Construction
Active
License #995505
B
Ontario, CA
Est. 2014
Guerrero Fire Protection Inc
Active
License #996238
C-16
Ontario, CA
Est. 2014
Tom'S Concrete Inc
Active
License #996477
C-8, C-53
Ontario, CA
Est. 2014
License #996848
B, C-9 +1 more
Ontario, CA
Est. 2014
Best Deal Shutters & Blinds
Active
License #997420
D52
Ontario, CA
Est. 2014
Opti-Comm Technologies Inc
Active
License #997934
C-7, C-10
Ontario, CA
Est. 2014
Axxess Door Corp
Active
License #999754
C-17, D28
Ontario, CA
Est. 2015
Jn Construction Inc
Active
License #1001396
A, B +4 more
Ontario, CA
Est. 2015
Upright Communications Inc
Active
License #1002378
C-10
Ontario, CA
Est. 2015
Prime Line Striping
Active
License #1002966
C-32
Ontario, CA
Est. 2015
Arias Electrical Services
Active
License #1005100
C-10
Ontario, CA
Est. 2015
J R Painting & Design
Active
License #1005335
C-33
Ontario, CA
Est. 2015
Inland Design Build
Active
License #1005429
A, B
Ontario, CA
Est. 2015
License #1005919
C-36
Ontario, CA
Est. 2015
Hci Sprinkler Inc
Active
License #1005968
C-10, C-16
Ontario, CA
Est. 2015
David Gray
Active
License #1008212
D52
Ontario, CA
Est. 2015
License #1009363
B
Ontario, CA
Est. 2015
Nsd Electric
Active
License #1009481
C-10
Ontario, CA
Est. 2015
License #1009518
C-9
Ontario, CA
Est. 2015
License #1009628
B, C-54
Ontario, CA
Est. 2015
Rose Garden Landscaping Inc
Active
License #1009854
C-27
Ontario, CA
Est. 2015
Myers Power Products Inc
Active
License #1009858
C-10
Ontario, CA
Est. 2015
Ford Brothers Framing Inc
Active
License #1010193
B
Ontario, CA
Est. 2016
Incredibuilds Inc
Active
License #1010448
B, C-33
Ontario, CA
Est. 2016
License #1011138
B
Ontario, CA
Est. 2016
Excell Construction Inc
Active
License #1011262
B
Ontario, CA
Est. 2016
Yacko Construction Inc
Active
License #1012085
A, B
Ontario, CA
Est. 2016
License #1012305
A
Ontario, CA
Est. 2016
Los Serrano Construction
Active
License #1012653
B
Ontario, CA
Est. 2016
K N J M Chiller Services Inc
Active
License #1014147
C-38
Ontario, CA
Est. 2016
Cesars Pool Repairs
Active
License #1014923
D35
Ontario, CA
Est. 2016
Jw Builders Inc
Active
License #1015948
B
Ontario, CA
Est. 2016
Lssi Llc
Active
License #1016641
C-10
Ontario, CA
Est. 2016
License #1017026
B
Ontario, CA
Est. 2016
Solar Electrical Plus Inc
Active
License #1017526
C-7, C-10
Ontario, CA
Est. 2016
License #1017796
A, C-36 +1 more
Ontario, CA
Est. 2016
Louis Palafox Construction
Active
License #1018409
B, C-10 +1 more
Ontario, CA
Est. 2016
License #1018578
D28
Ontario, CA
Est. 2016
License #1018725
B
Ontario, CA
Est. 2016
Ac Power 1 Inc
Active
License #1018955
C-10
Ontario, CA
Est. 2016
Mechanical Control
Active
License #1019123
C-20
Ontario, CA
Est. 2016
Eagle Signs Inc
Active
License #1019394
C-45
Ontario, CA
Est. 2016
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Licensing Resources
How to verify a contractor license
Deposit and payment rules for California contracts
Home improvement contract requirements