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)
T & C Maintenance Services
Active
License #1039358
B
Ontario, CA
Est. 2018
West United Builder
Active
License #1039373
B
Ontario, CA
Est. 2018
Db Construction Inc
Active
License #1039670
B
Ontario, CA
Est. 2018
Klear Sand
Active
License #1040426
C-53
Ontario, CA
Est. 2018
Deer Canyon Electric Inc
Active
License #1041297
C-10
Ontario, CA
Est. 2018
Elite Air Solutions
Active
License #1041482
C-20
Ontario, CA
Est. 2018
Ansary Aboubakare
Active
License #1042235
B, C-20 +1 more
Ontario, CA
Est. 2018
R W Nolte Construction Inc
Active
License #1042244
B
Ontario, CA
Est. 2018
License #1042872
D34
Ontario, CA
Est. 2018
Clara Veronica Alatorre
Active
License #1043353
C-33
Ontario, CA
Est. 2018
Christopher Arvizu
Active
License #1043693
B
Ontario, CA
Est. 2018
Elite Painters Inc
Active
License #1044924
C-33
Ontario, CA
Est. 2018
License #1045173
B, C-20 +1 more
Ontario, CA
Est. 2018
Hero Coatings
Active
License #1045348
C-33, D12
Ontario, CA
Est. 2018
Cristian Euceda
Active
License #1045755
C-33
Ontario, CA
Est. 2018
Rodolfo Blas
Active
License #1045920
C-33
Ontario, CA
Est. 2018
License #1046041
B, C-29
Ontario, CA
Est. 2018
Zhiyong Meng
Active
License #1046125
B
Ontario, CA
Est. 2018
Andrew George Turner
Active
License #1046234
C-10
Ontario, CA
Est. 2018
Brush N Roll Painting
Active
License #1046867
C-33
Ontario, CA
Est. 2018
Integrated Flooring Inc
Active
License #1047013
C-15, C-54
Ontario, CA
Est. 2018
Diamond Air Services Inc
Active
License #1047483
B, C-20 +1 more
Ontario, CA
Est. 2018
A 2 Z Plumbing
Active
License #1047486
C-36
Ontario, CA
Est. 2018
Davis Mobile Home Services
Active
License #1047748
C-47
Ontario, CA
Est. 2018
Hb Construction
Active
License #1047800
B
Ontario, CA
Est. 2018
License #1048170
C-42
Ontario, CA
Est. 2018
Gerardo Alvarado
Active
License #1048441
C-6
Ontario, CA
Est. 2018
Jdk Demo
Active
License #1048561
C-12, C-21
Ontario, CA
Est. 2019
License #1048984
C-10
Ontario, CA
Est. 2019
License #1049531
B, C-10 +1 more
Ontario, CA
Est. 2019
Bc7 Construction Inc
Active
License #1049615
B, C-36
Ontario, CA
Est. 2019
License #1049640
B
Ontario, CA
Est. 2019
Form & Function Landscape
Active
License #1049832
C-27
Ontario, CA
Est. 2019
Maple Tree Service
Active
License #1050206
D49
Ontario, CA
Est. 2019
Hr Garcia Construction Inc
Active
License #1050598
B
Ontario, CA
Est. 2019
Martinez Steel Llc
Active
License #1050623
C-50
Ontario, CA
Est. 2019
Innovation Painting Inc
Active
License #1051191
C-33
Ontario, CA
Est. 2019
A&B Plumbing Solutions Inc
Active
License #1051865
C-36
Ontario, CA
Est. 2019
M J Pacific Inc
Active
License #1051869
A
Ontario, CA
Est. 2019
Pro Rooter Guys Inc
Active
License #1052306
C-36
Ontario, CA
Est. 2019
License #1052668
C-15
Ontario, CA
Est. 2019
Aranda'S Sanitation Systems
Active
License #1053122
C-42
Ontario, CA
Est. 2019
Grace Pro Roofing Inc
Active
License #1053426
C-39
Ontario, CA
Est. 2019
Virtue Air Conditioning Inc
Active
License #1053503
C-20
Ontario, CA
Est. 2019
Orellana'S Garage Doors Inc
Active
License #1054005
D28
Ontario, CA
Est. 2019
Chun Li
Active
License #1054025
C-20
Ontario, CA
Est. 2019
Penghao Yuan Construction
Active
License #1054088
B
Ontario, CA
Est. 2019
E Solar Company
Active
License #1054112
C-10, C-46
Ontario, CA
Est. 2019
Sitelogiq Inc
Active
License #1054171
A, B +1 more
Ontario, CA
Est. 2019
M A C Metal Systems Services
Active
License #1055216
D24
Ontario, CA
Est. 2019
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Licensing Resources
How to verify a contractor license
Deposit and payment rules for California contracts
Home improvement contract requirements