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)
All Day Drains Active
License #1088634 C-36 Diamond Bar, CA Est. 2022
Maj Engineering Active
License #1089238 A Diamond Bar, CA Est. 2022
Avanti Membrane Technology Inc Active
License #1091779 C-55 Diamond Bar, CA Est. 2022
Padilla'S Grading And Paving Active
License #1093279 B, C-12 Diamond Bar, CA Est. 2022
Dyconn Inc Active
License #1093822 B Diamond Bar, CA Est. 2022
Pjcy Renovation Active
License #1095968 B Diamond Bar, CA Est. 2022
Allwayz Heating & Air Conditioning Inc Active
License #1097372 C-20 Diamond Bar, CA Est. 2022
Beshear Floor Active
License #1100076 C-15 Diamond Bar, CA Est. 2022
Vanta Construction & Design Active
License #1100647 B, C-10 Diamond Bar, CA Est. 2023
Diamond Springs Pools Active
License #1102367 C-53 Diamond Bar, CA Est. 2023
Datang Building Service Inc Active
License #1103658 B Diamond Bar, CA Est. 2023
Barron Electric Active
License #1104314 C-10 Diamond Bar, CA Est. 2023
5 Zero Inc Active
License #1105104 B Diamond Bar, CA Est. 2023
Top Choice Construction Service Inc Active
License #1105149 B Diamond Bar, CA Est. 2023
Chung Chieh Wu Active
License #1105504 C-20 Diamond Bar, CA Est. 2023
Honest Pro Air Conditioning And Heating Active
License #1106190 C-20 Diamond Bar, CA Est. 2023
Dcloud Homes Active
License #1106436 B Diamond Bar, CA Est. 2023
Ricardo A Lizarraga Active
License #1109743 B Diamond Bar, CA Est. 2023
Acemd Corporation Active
License #1111963 B Diamond Bar, CA Est. 2023
Cabinets 4 You Llc Active
License #1112243 B Diamond Bar, CA Est. 2023
Servicemaster Restoration By Disaster Services Active
License #1113356 B Diamond Bar, CA Est. 2023
W Z Home Design Inc Active
License #1113443 B Diamond Bar, CA Est. 2023
Xiaoqing Active
License #1113933 C-10 Diamond Bar, CA Est. 2023
L Quijano Active
License #1115522 B Diamond Bar, CA Est. 2024
Zhuoxin Construction Active
License #1116182 B, C-10 Diamond Bar, CA Est. 2024
Jt Project Management Inc Active
License #1116801 B Diamond Bar, CA Est. 2024
Xinlongyuan Construction Inc Active
License #1118997 B Diamond Bar, CA Est. 2024
Blue Star Contractor Active
License #1120031 B Diamond Bar, CA Est. 2024
Big Mango Renovation Inc Active
License #1121648 B Diamond Bar, CA Est. 2024
Lanyi Usa Inc Active
License #1121762 C-20 Diamond Bar, CA Est. 2024
Advanced Tankless And Plumbing Active
License #1121827 C-36 Diamond Bar, CA Est. 2024
Evercraft Construction Inc Active
License #1122597 B Diamond Bar, CA Est. 2024
Light Contracting Active
License #1122793 C-2 Diamond Bar, CA Est. 2024
Dk Air & Refrigeration Active
License #1123000 C-38 Diamond Bar, CA Est. 2024
Ray Bi Electrical & Energy Llc Active
License #1125153 C-10 Diamond Bar, CA Est. 2024
Dreamer Construction And Development Active
License #1125664 B Diamond Bar, CA Est. 2024
Sierra Peaks Landscaping Active
License #1128080 C-27 Diamond Bar, CA Est. 2024
Yin Construction Enterprises Llc Active
License #1128987 B Diamond Bar, CA Est. 2024
Dz Prime Construction Active
License #1129072 B Diamond Bar, CA Est. 2024
Arow Electric Active
License #1129710 C-10 Diamond Bar, CA Est. 2024
S V L Construction Operations Active
License #1131331 B Diamond Bar, CA Est. 2025
Ca Sunshine Electrical Active
License #1133255 C-10 Diamond Bar, CA Est. 2025
Zy Hvac Equipment Services Active
License #1133374 C-20 Diamond Bar, CA Est. 2025
Wkh Construction Service Inc Active
License #1136117 B Diamond Bar, CA Est. 2025
Stl Home Build Inc Active
License #1136498 B Diamond Bar, CA Est. 2025
Touchstone Construction Active
License #1137830 B Diamond Bar, CA Est. 2025
Freddie Vega Active
License #1138185 B Diamond Bar, CA Est. 2025
Gary & Son Construction Active
License #1138649 B Diamond Bar, CA Est. 2025
Dongqiang Lu Active
License #1139854 B Diamond Bar, CA Est. 2025
Joe Construction Group Active
License #1140095 B Diamond Bar, CA Est. 2025

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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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