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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)

• 3 T MEDIA INC CLEAR
  License 987903 · expires October 31, 2027
• 5 ZERO INC CLEAR
  License 1105104 · expires May 31, 2027
• A AND L SYSTEMS SOLUTIONS CLEAR
  License 966840 · expires February 29, 2028
• A E D CONTRACTORS CLEAR
  License 441036 · expires March 31, 2028
• AC HEAT DIAMOND BAR CLEAR
  License 1145762 · expires October 31, 2027
• ACE IRON WORKS CLEAR
  License 539620 · expires August 31, 2028
• ACE PLUMBING CO CLEAR
  License 785570 · expires October 31, 2028
• ACE RODIL HEATING AND AIR CONDITIONING CLEAR
  License 631042 · expires October 31, 2027
• ACEMD CORPORATION CLEAR
  License 1111963 · expires October 31, 2027
• ADAMS ELECTRIC CLEAR
  License 448001 · expires October 31, 2027
• ADVANCED TANKLESS AND PLUMBING CLEAR
  License 1121827 · expires June 30, 2028
• AIRPROPOWER CLEAR
  License 1150732 · expires February 29, 2028
• ALL ABOUT T-BAR CLEAR
  License 570421 · expires June 30, 2027
• ALL DAY DRAINS CLEAR
  License 1088634 · expires March 31, 2028
• ALLIANT CONSTRUCTION SERVICES INC CLEAR
  License 1061441 · expires December 31, 2027
• ALLWAYZ HEATING & AIR CONDITIONING INC CLEAR
  License 1097372 · expires October 31, 2028
• ALPHA CONSTRUCTION SERVICES INC CLEAR
  License 1015331 · expires June 30, 2028
• AMEHS WINDOWS & GLASS DOORS CLEAR
  License 1163528 · expires October 31, 2028
• AMERICAN RESOURCES CORPORATION CLEAR
  License 895201 · expires April 30, 2027
• APEX CONSTRUCTION BUILDER INC CLEAR
  License 1074739 · expires April 30, 2027
• APPLE PAINTING CO Contr Bond Susp
  License 610301 · expires January 31, 2027
• APT CONSTRUCTION INC CLEAR
  License 1149695 · expires January 31, 2028
• AQUARENA WATER CONDITIONING CLEAR
  License 1160847 · expires September 30, 2028
• ARKIUS INC Work Comp Susp
  License 673454 · expires March 31, 2027
• AROW ELECTRIC CLEAR
  License 1129710 · expires November 30, 2026
• ATLANTIC AIR CONDITIONING INC CLEAR
  License 613226 · expires March 31, 2027
• AVANTI MEMBRANE TECHNOLOGY INC CLEAR
  License 1091779 · expires May 31, 2028
• AVEO INC CLEAR
  License 969881 · expires February 29, 2028
• B7 BUILDERS CLEAR
  License 1065231 · expires April 30, 2028
• BARRON ELECTRIC CLEAR
  License 1104314 · expires May 31, 2027
• BESHEAR FLOOR CLEAR
  License 1100076 · expires December 31, 2026
• BIG DEMOLITION AND CONSTRUCTION CLEAR
  License 1162961 · expires October 31, 2028
• BIG ELEPHANT CONSTRUCTION INC CLEAR
  License 1031703 · expires October 31, 2027
• BIG MANGO RENOVATION INC CLEAR
  License 1121648 · expires June 30, 2028
• BLUE STAR CONTRACTOR CLEAR
  License 1120031 · expires April 30, 2028
• C - THIRTY - SIX INC CLEAR
  License 739644 · expires May 31, 2028
• C S D M INC DBA CAL STEAM COMPANY CLEAR
  License 674646 · expires April 30, 2027
• CA SUNSHINE ELECTRICAL CLEAR
  License 1133255 · expires February 28, 2027
• CABINETS 4 YOU LLC CLEAR
  License 1112243 · expires May 31, 2028
• CANY FIRE PROTECTION INC CLEAR
  License 1142986 · expires September 30, 2027
• CARVE MODULAR CORPORATION CLEAR
  License 1154699 · expires May 31, 2028
• CASTANEDA CONSTRUCTION CLEAR
  License 932830 · expires May 31, 2027
• CENTALINE CONSTRUCTION INC CLEAR
  License 1145427 · expires October 31, 2027
• CFP CONSTRUCTION INC CLEAR
  License 700920 · expires January 31, 2027
• CHUNG CHIEH WU CLEAR
  License 1105504 · expires June 30, 2027
• CHYR-SHIN PAUL TSAO CLEAR
  License 670052 · expires April 30, 2027
• CIEL AIR CONDITIONING AND ELECTRIC CLEAR
  License 1039457 · expires May 31, 2028
• CLIMATE SPECIALISTS CLEAR
  License 1003654 · expires May 31, 2027
• CM INNOVATE INC CLEAR
  License 992367 · expires April 30, 2028
• COLONY ON GREEN CLEAR
  License 951899 · expires September 30, 2028

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