Licensed Contractors in Diamond Bar, California

All license data is sourced from the California Contractors State License Board (CSLB). Last data update: April 19, 2026.

Contractors by Trade

Building (194)
Electrical (51)
HVAC (40)
Plumbing (29)
Painting (25)
Landscaping (13)
Fire (9)
Limited (9)
Roofing (7)
Earthwork (6)
Solar (3)
Welding (2)
Uni Construction Active
License #1026926 B Diamond Bar, CA Est. 2017
Big Elephant Construction Inc Active
License #1031703 B Diamond Bar, CA Est. 2017
Nexville Construction Inc Active
License #1035410 B Diamond Bar, CA Est. 2018
Regional Signs & Lighting Active
License #1036143 C-45 Diamond Bar, CA Est. 2018
Nexera Builders Inc Active
License #1037400 B Diamond Bar, CA Est. 2018
Hong Ding Construction Inc Active
License #1038313 B Diamond Bar, CA Est. 2018
Ray Electrical Engineering Inc Active
License #1039207 C-10 Diamond Bar, CA Est. 2018
New Life Construction And Renovation Active
License #1039347 B Diamond Bar, CA Est. 2018
Ciel Air Conditioning And Electric Active
License #1039457 C-10, C-20 Diamond Bar, CA Est. 2018
Hjr Contracting Inc Active
License #1041548 B, C-20 Diamond Bar, CA Est. 2018
Unicorn Construction Active
License #1042772 B Diamond Bar, CA Est. 2018
Medrara Hvac Active
License #1042958 C-20 Diamond Bar, CA Est. 2018
Yuan Zhang Active
License #1042983 B Diamond Bar, CA Est. 2018
D A S Builder Inc Active
License #1044031 B Diamond Bar, CA Est. 2018
Nartin Construction & Home Improvement Active
License #1044853 B Diamond Bar, CA Est. 2018
Construction Group Of America Corp Active
License #1047350 B Diamond Bar, CA Est. 2018
Dux Technology Consulting Inc Active
License #1050592 C-7 Diamond Bar, CA Est. 2019
Huamei Construction Inc Active
License #1051093 B Diamond Bar, CA Est. 2019
Young Chai Jung Active
License #1051661 B Diamond Bar, CA Est. 2019
Thm Associates Inc Active
License #1052347 C-7 Diamond Bar, CA Est. 2019
Fill Good Landscaping Active
License #1053396 C-27 Diamond Bar, CA Est. 2019
Peter Yiping Hu Active
License #1053475 B Diamond Bar, CA Est. 2019
Riva Property Management Active
License #1053668 B Diamond Bar, CA Est. 2019
R H Construction And Design Inc Active
License #1054283 B Diamond Bar, CA Est. 2019
Jamie Jinzuo Huang Active
License #1055726 B Diamond Bar, CA Est. 2019
Smart Construction Active
License #1056267 B, C-10 Diamond Bar, CA Est. 2019
Samuel J Lee Active
License #1060372 B Diamond Bar, CA Est. 2019
Haitao Feng Active
License #1061261 C-7 Diamond Bar, CA Est. 2019
Alliant Construction Services Inc Active
License #1061441 B Diamond Bar, CA Est. 2019
B7 Builders Active
License #1065231 B Diamond Bar, CA Est. 2020
Galvan Plumbing Active
License #1065435 C-36 Diamond Bar, CA Est. 2020
Isre Interact Solutions Real Estate Active
License #1066181 A, B +2 more Diamond Bar, CA Est. 2020
Zhang Contractions Active
License #1068051 B Diamond Bar, CA Est. 2020
Jonghyun Park Active
License #1071186 B Diamond Bar, CA Est. 2020
Dream Space Construction Active
License #1071725 B, C-33 Diamond Bar, CA Est. 2020
Robert Velazquez Construction Active
License #1072001 B Diamond Bar, CA Est. 2020
Giant Palms Construction Inc Active
License #1072035 B, C-33 Diamond Bar, CA Est. 2020
L B Air Conditioning Active
License #1072480 C-20 Diamond Bar, CA Est. 2021
Suncoast Home Elevators Corp Active
License #1073048 C-11 Diamond Bar, CA Est. 2021
Lexar Construction Active
License #1074012 B Diamond Bar, CA Est. 2021
Apex Construction Builder Inc Active
License #1074739 B Diamond Bar, CA Est. 2021
Grand Space Active
License #1075915 A, B Diamond Bar, CA Est. 2021
Integrated Wiring Concepts Inc Active
License #1076152 C-10 Diamond Bar, CA Est. 2021
Thlc Corporation Active
License #1077041 B, C-10 +3 more Diamond Bar, CA Est. 2021
Yq Air Condition Solution Active
License #1077548 C-20 Diamond Bar, CA Est. 2021
Jkz Group Inc Active
License #1080141 B Diamond Bar, CA Est. 2021
Ichien Chen Active
License #1080792 B Diamond Bar, CA Est. 2021
Yellowstone Workx Inc Active
License #1084592 B, C-54 Diamond Bar, CA Est. 2021
High Noon Air Active
License #1085441 C-20, C-38 Diamond Bar, CA Est. 2021
Yuze Air Conditioning Active
License #1086305 C-20 Diamond Bar, CA Est. 2022

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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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