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Contractor license records in Diamond Bar, CA
312 records with Diamond Bar as their locality of record in CSLB's records, as of November 3, 2026. Statuses print as the board records them; a record listed as suspended is not a current credential.
Source: California Contractors State License Board (CSLB) — records as of November 3, 2026. Records change; the board’s own CSLB License Check is the current source.
By classification in Diamond Bar
General Building (180) · Electrical (46) · Warm-Air Heating, Ventilating and Air-Conditioning (35) · Plumbing (27) · General Engineering (14) · Painting and Decorating (12) · Low Voltage Systems (10) · Landscaping (9) · Ceramic and Mosaic Tile (8) · Flooring and Floor Covering (6) · Roofing (5) · Fire Protection (5) · Refrigeration (4) · Cabinet, Millwork and Finish Carpentry (4) · Concrete (3) · Hazardous Substance Removal Certification (3) · Concrete-Related Services (3) · Insulation and Acoustical (3) · Glazing (3) · Sign (2) · Elevator (2) · Water Conditioning (2) · Earthwork and Paving (2) · Drywall (2) · Sanitation System (2) · Pool and Spa Maintenance (2) · Tree Service (1) · Solar (1) · Masonry (1) · Synthetic Products (1) · Swimming Pool (1) · Structural Steel (1) · Doors, Gates and Activating Devices (1) · Asbestos Certification (1) · Building Moving/Demolition (1) · Ornamental Metal (1) · Well Drilling (1) · Boiler, Hot-Water Heating and Steam Fitting (1) · Residential Remodeling (1) · Prefabricated Equipment (1)
- YIN PING LIU CLEAR
- YIU MING YUEN CLEAR
- YOUNG CHAI JUNG CLEAR
- YOUNGJIN STEEL INC CLEAR
- YQ AIR CONDITION SOLUTION CLEAR
- YU GENERAL CONSTRUCTION INC CLEAR
- YUAN ZHANG CLEAR
- YUZE AIR CONDITIONING CLEAR
- ZHIBIN SU CLEAR
- ZHUOXIN CONSTRUCTION CLEAR
- ZIP RENOVATION & AIR CLEAR
- ZY HVAC EQUIPMENT SERVICES CLEAR
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