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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)

• JKZ GROUP INC CLEAR
  License 1080141 · expires August 31, 2027
• JOE CLEDERA ABLAY CLEAR
  License 629389 · expires July 31, 2027
• JOE CLIFTON TILE CONTRACTOR INC CLEAR
  License 401939 · expires March 31, 2027
• JOE CONSTRUCTION GROUP CLEAR
  License 1140095 · expires July 31, 2027
• JOHN PARK CLEAR
  License 961400 · expires May 31, 2027
• JONATHAN KO CLEAR
  License 939589 · expires October 31, 2027
• JONES PLUMBING CLEAR
  License 917266 · expires June 30, 2028
• JONGHYUN PARK CLEAR
  License 1071186 · expires November 30, 2026
• JORGE LAMBARENA CLEAR
  License 759138 · expires February 28, 2027
• JRQ FINISH CARPENTRY CLEAR
  License 972407 · expires October 31, 2027
• JT PROJECT MANAGEMENT INC CLEAR
  License 1116801 · expires February 29, 2028
• JUSTPRIME CONSTRUCTION INC CLEAR
  License 1153105 · expires April 30, 2028
• K M K GLAZING CONTRACTORS CLEAR
  License 917948 · expires June 30, 2028
• K3GS LLC CLEAR
  License 1064281 · expires March 31, 2028
• KAI XIA Contr Bond Susp
  License 1018407 · expires September 30, 2028
• KENNETH DALEY HEATING & AIR SERVICES CLEAR
  License 798187 · expires August 31, 2027
• KERTLAND ROOFING INC CLEAR
  License 510174 · expires May 31, 2027
• KITCHEN AND FLOORING CENTER INC CLEAR
  License 968078 · expires December 31, 2027
• KUN HO SHIN CLEAR
  License 1161518 · expires September 30, 2028
• L B AIR CONDITIONING CLEAR
  License 1072480 · expires January 31, 2027
• L L L DEVELOPMENT INC CLEAR
  License 923665 · expires June 30, 2028
• LA ELECTRICAL & CONSTRUCTION INC CLEAR
  License 1119000 · expires April 30, 2028
• LANYI USA INC CLEAR
  License 1121762 · expires June 30, 2028
• LD CONSTRUCTION CLEAR
  License 1154620 · expires May 31, 2028
• LEXAR CONSTRUCTION CLEAR
  License 1074012 · expires March 31, 2027
• LHW CONSTRUCTION INC CLEAR
  License 1095664 · expires August 31, 2028
• LIANG ZHOU CLEAR
  License 982880 · expires April 30, 2027
• LIBERTY WOODWORKING CLEAR
  License 903696 · expires September 30, 2027
• LIGHT CONTRACTING CLEAR
  License 1122793 · expires June 30, 2028
• LIKAI CHEN HVAC INC CLEAR
  License 926434 · expires December 31, 2027
• LILI SHENG CLEAR
  License 1163154 · expires October 31, 2028
• LUCAS ELECTRICAL CLEAR
  License 888594 · expires December 31, 2026
• M & E MANAGEMENT GROUP INC CLEAR
  License 969068 · expires January 31, 2028
• M D B DESIGN ASSOCIATES CLEAR
  License 653762 · expires September 30, 2028
• M S T GROUP INC DBA M S T CONSTRUCTION CLEAR
  License 837086 · expires February 28, 2027
• M T QUALITY CONSTRUCTION CLEAR
  License 586957 · expires January 31, 2028
• MAC REFRIGERATION AND AIR CONDITIONING CO CLEAR
  License 580557 · expires November 30, 2027
• MAJ ENGINEERING CLEAR
  License 1089238 · expires March 31, 2028
• MASTER PAINTING CO CLEAR
  License 658145 · expires November 30, 2026
• MCDONALD CONSTRUCTION CLEAR
  License 870492 · expires January 31, 2028
• MCMASTER MECHANICAL CLEAR
  License 879152 · expires February 28, 2027
• MEDRARA HVAC Contr Bond Susp
  License 1042958 · expires August 31, 2028
• MENGQI CONSTRUCTION CLEAR
  License 1150260 · expires February 29, 2028
• MICHAEL STEVEN FEDOROW CLEAR
  License 652125 · expires October 31, 2027
• MING CHU CHEN CHIEN CLEAR
  License 820540 · expires June 30, 2027
• MING'S CONSTRUCTION AND HOTEL RENOVATION Contr Bond Susp
  License 973795 · expires June 30, 2028
• MIRAE CONSTRUCTION CO CLEAR
  License 876472 · expires May 31, 2028
• MONAIR CONTRACTORS CLEAR
  License 677543 · expires March 31, 2027
• MONARCH DECK COATINGS CLEAR
  License 974168 · expires June 30, 2028
• MONARCH INFORMATION SYSTEMS LLC CLEAR
  License 1007648 · expires February 28, 2027

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