Licensed Contractors in Diamond Bar, California
All license data is sourced from the California Contractors State License Board (CSLB). Last data update: May 24, 2026.
Contractors by Trade
Building
(195)
Electrical
(52)
HVAC
(40)
Plumbing
(29)
Painting
(25)
Landscaping
(13)
Fire
(9)
Limited
(9)
Roofing
(7)
Earthwork
(6)
Solar
(3)
Welding
(1)
Jae Do Lee
Active
License #1140383
B
Diamond Bar, CA
Est. 2025
Jiancai Construction Inc
Active
License #1141118
B
Diamond Bar, CA
Est. 2025
Pathfinder Construction
Active
License #1141723
B
Diamond Bar, CA
Est. 2025
Imperium Roofing Inc
Active
License #1141782
C-39
Diamond Bar, CA
Est. 2025
License #1141851
B
Diamond Bar, CA
Est. 2025
Hong Construction
Active
License #1142230
B
Diamond Bar, CA
Est. 2025
Park S Roofing Usa
Active
License #1142782
C-39
Diamond Bar, CA
Est. 2025
Walnut Housing Tech Inc
Active
License #1142816
B
Diamond Bar, CA
Est. 2025
Yiu Ming Yuen
Active
License #1142834
B
Diamond Bar, CA
Est. 2025
Cany Fire Protection Inc
Active
License #1142986
C-16, C-36
Diamond Bar, CA
Est. 2025
Seven Diamonds Inc
Active
License #1143632
B
Diamond Bar, CA
Est. 2025
Elite Pipe P
Active
License #1144688
C-36
Diamond Bar, CA
Est. 2025
License #1144854
C-10
Diamond Bar, CA
Est. 2025
Donglianglu
Active
License #1145119
B
Diamond Bar, CA
Est. 2025
Centaline Construction Inc
Active
License #1145427
B
Diamond Bar, CA
Est. 2025
Wang Ziyi Construction
Active
License #1145455
B
Diamond Bar, CA
Est. 2025
Ac Heat Diamond Bar
Active
License #1145762
C-20
Diamond Bar, CA
Est. 2025
Urbanedge Construction Inc
Active
License #1145858
B
Diamond Bar, CA
Est. 2025
Isanvo Construction Inc
Active
License #1146026
B
Diamond Bar, CA
Est. 2025
Wh Electrical
Active
License #1147623
C-10
Diamond Bar, CA
Est. 2025
New Life Construction
Active
License #1148327
B
Diamond Bar, CA
Est. 2025
Apt Construction Inc
Active
License #1149695
B
Diamond Bar, CA
Est. 2026
Ecp Construction
Active
License #1150062
B
Diamond Bar, CA
Est. 2026
Mengqi Construction
Active
License #1150260
B
Diamond Bar, CA
Est. 2026
Airpropower
Active
License #1150732
C-10, C-20
Diamond Bar, CA
Est. 2026
Song Construction
Active
License #1151604
B
Diamond Bar, CA
Est. 2026
Viviluxe Construction Inc
Active
License #1151920
B
Diamond Bar, CA
Est. 2026
Plhk Hvac Inc
Active
License #1151997
C-20
Diamond Bar, CA
Est. 2026
Wei Ouyang
Active
License #1152437
B
Diamond Bar, CA
Est. 2026
Justprime Construction Inc
Active
License #1153105
B
Diamond Bar, CA
Est. 2026
Qed Factory Inc
Active
License #1153759
B
Diamond Bar, CA
Est. 2026
Ld Construction
Active
License #1154620
B
Diamond Bar, CA
Est. 2026
Carve Modular Corporation
Active
License #1154699
B
Diamond Bar, CA
Est. 2026
Zhibin Su
Active
License #1155412
B
Diamond Bar, CA
Est. 2026
Sunrise Building Group Inc
Active
License #1155622
B
Diamond Bar, CA
Est. 2026
Yu General Construction Inc
Active
License #1155644
B
Diamond Bar, CA
Est. 2026
Three Star Construction & Painting Co
Suspended
License #337314
B, C-33
Diamond Bar, CA
Est. 1977
Apple Painting Co
Suspended
License #610301
C-33
Diamond Bar, CA
Est. 1991
Aba Builders Inc
Suspended
License #624574
B
Diamond Bar, CA
Est. 1991
Gary'S Ac Services
Suspended
License #921063
C-20
Diamond Bar, CA
Est. 2008
R A Z Electric
Suspended
License #932271
C-10
Diamond Bar, CA
Est. 2009
Mtz Development
Suspended
License #981566
A, B +1 more
Diamond Bar, CA
Est. 2013
G N Y Inc
Suspended
License #1033410
C-7
Diamond Bar, CA
Est. 2017
K3Gs Llc
Suspended
License #1064281
C-7
Diamond Bar, CA
Est. 2020
Giant Palms Construction Inc
Suspended
License #1072035
B, C-33
Diamond Bar, CA
Est. 2020
License #1134197
B
Diamond Bar, CA
Est. 2025
Get Quotes from Diamond Bar Contractors
Compare quotes from licensed, pre-screened contractors in Diamond Bar. Check ratings and reviews before you hire.
Licensing Resources
How to verify a contractor license
Deposit and payment rules for California contracts
Home improvement contract requirements