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Contractor license records in Ontario, CA

918 records with Ontario 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 Ontario

General Building (338) · Electrical (137) · General Engineering (61) · Warm-Air Heating, Ventilating and Air-Conditioning (51) · Painting and Decorating (50) · Plumbing (49) · Low Voltage Systems (36) · Landscaping (34) · Concrete (32) · Flooring and Floor Covering (32) · Roofing (26) · Cabinet, Millwork and Finish Carpentry (22) · Doors, Gates and Activating Devices (22) · Glazing (21) · Drywall (20) · Ceramic and Mosaic Tile (18) · Synthetic Products (17) · Swimming Pool (16) · Masonry (16) · Structural Steel (13) · Fire Protection (12) · Refrigeration (12) · Building Moving/Demolition (12) · Pool and Spa Maintenance (11) · Window Coverings (9) · Sanitation System (9) · Prefabricated Equipment (9) · Lathing and Plastering (9) · Earthwork and Paving (8) · Metal Products (8) · Parking and Highway Improvement (7) · Sign (7) · Reinforcing Steel (7) · Machinery and Pumps (7) · Concrete-Related Services (7) · Hazardous Substance Removal Certification (6) · Ornamental Metal (6) · Fencing (5) · Service Station Equipment and Maintenance (5) · Sheet Metal (5) · Welding (5) · Framing and Rough Carpentry (4) · Construction Cleanup (4) · Tree Service (4) · Residential Remodeling (4) · Non-Electrical Sign Installation (3) · Solar (3) · Non-specialized (3) · Asbestos Certification (3) · Asbestos Abatement (3) · Tree and Palm (3) · Paperhanging (2) · Awnings (2) · Construction Zone Traffic Control (2) · Boiler, Hot-Water Heating and Steam Fitting (2) · Pipeline (2) · Insulation and Acoustical (2) · General Manufactured Housing (1) · Suspended Ceilings (1) · Well Drilling (1) · Lock and Security Equipment (1) · Hardware, Locks and Safes (1) · Safes and Vaults (1) · Siding and Decking (1) · Scaffolding (1)

• WESTSIDE PRO BUILDERS CLEAR
  License 1116368 · expires February 29, 2028
• WH JEWETT INC CLEAR
  License 975875 · expires August 31, 2028
• WIRENET COMMUNICATIONS INC CLEAR
  License 865478 · expires October 31, 2027
• WISKIND CONSTRUCTION INC CLEAR
  License 1137238 · expires May 31, 2027
• WKA GROUP INC CLEAR
  License 1134050 · expires March 31, 2027
• WM CONSTRUCTION CLEAR
  License 1097687 · expires October 31, 2028
• WOLF WINDOWS AND DOORS CLEAR
  License 1157111 · expires June 30, 2028
• WRIGHT WOOD ROOFING INC CLEAR
  License 1106726 · expires June 30, 2027
• XACT WINDOW TINTING Work Comp Susp
  License 889275 · expires January 31, 2027
• Y&D GENERAL SERVICES CLEAR
  License 1127476 · expires October 31, 2028
• YACKO CONSTRUCTION INC CLEAR
  License 1012085 · expires March 31, 2028
• YICUN CONSTRUCTION CLEAR
  License 1098350 · expires November 30, 2026
• YOUNG C LEE CLEAR
  License 867519 · expires November 30, 2027
• Z1 CONSTRUCTION CLEAR
  License 1064551 · expires March 31, 2028
• ZEVEN ELECTRIC CLEAR
  License 856544 · expires March 31, 2027
• ZHIYUAN LI CONSTRUCTION CLEAR
  License 1158107 · expires July 31, 2028
• ZIENIX PROPERTY SERVICES CLEAR
  License 1142312 · expires August 31, 2027
• ZSOLT SIMON WOOD WOORKS CLEAR
  License 906047 · expires November 30, 2027

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