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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)

• JIMMY'S TREE CARE INC CLEAR
  License 1119821 · expires April 30, 2028
• JL PROFESSIONAL TREE SERVICE CORP CLEAR
  License 1154444 · expires May 31, 2028
• JMD ELECTRIC CLEAR
  License 1124274 · expires July 31, 2028
• JML ELECTRIC CLEAR
  License 1116001 · expires February 29, 2028
• JN CONSTRUCTION INC CLEAR
  License 1001396 · expires February 28, 2027
• JNSD CONSTRUCTION INC CLEAR
  License 1080741 · expires September 30, 2027
• JOCAEL PALOMINO CLEAR
  License 644395 · expires May 31, 2028
• JOD DOMINGUEZ CLEAR
  License 1084844 · expires December 31, 2027
• JOE LANDSCAPE CLEAR
  License 1132759 · expires February 28, 2027
• JOHN FITZGERALD DEVINE CLEAR
  License 934292 · expires June 30, 2027
• JOHN SCHWAB NEWPORT BEACH DECK WATERPROOFING CLEAR
  License 733662 · expires March 31, 2027
• JOHN YACKO CLEAR
  License 764923 · expires September 30, 2027
• JOHNNIE RIGHTMER CLEAR
  License 929338 · expires March 31, 2027
• JORCAST ENTERPRISES INC CLEAR
  License 559980 · expires December 31, 2026
• JOSE L DIAZ DBA EMPIRE ROOFING CO CLEAR
  License 836616 · expires April 30, 2028
• JOSE LUIS PALACIOS CLEAR
  License 986197 · expires August 31, 2027
• JOSE SALAS CLEAR
  License 859777 · expires May 31, 2027
• JOSEPH CONSTRUCTION CLEAR
  License 674654 · expires July 31, 2027
• JOURNEYMAN IRON WORKS CORPORATION CLEAR
  License 1065387 · expires April 30, 2028
• JR LANDSCAPING CLEAR
  License 1094350 · expires July 31, 2028
• JULAN HAO CLEAR
  License 1083815 · expires November 30, 2027
• JULIO ANTONIO CASTILLO CLEAR
  License 844311 · expires August 31, 2028
• JUNIOR'S CARPET & FLOOR COVERING CLEAR
  License 1052668 · expires April 30, 2027
• JUST EVERYTHING HEATING & AIR INC CLEAR
  License 892799 · expires August 31, 2027
• JUST IN TIME COMMUNICATIONS INC CLEAR
  License 890177 · expires January 31, 2027
• JUST TEMPERATURE INC CLEAR
  License 1062818 · expires January 31, 2028
• JVR ENTERPRISES INC CLEAR
  License 1027158 · expires May 31, 2027
• JW BUILDERS INC CLEAR
  License 1015948 · expires July 31, 2028
• K & Z CABINET CO INC CLEAR
  License 319196 · expires August 31, 2027
• K A R CONSTRUCTION INC CLEAR
  License 595709 · expires June 30, 2028
• K P CONSTRUCTION CO INC CLEAR
  License 790555 · expires August 31, 2028
• K&D LANDSCAPE INC CLEAR
  License 1032430 · expires November 30, 2027
• KEMCORP CONSTRUCTION INC CLEAR
  License 934522 · expires June 30, 2027
• KEN LEE CLEAR
  License 1138718 · expires June 30, 2027
• KENNEDY STEEL CLEAR
  License 1086611 · expires January 31, 2028
• KINGDOM FLOORING CLEAR
  License 964588 · expires August 31, 2027
• KLAUS NORBERT KRAEMER CLEAR
  License 529570 · expires October 31, 2028
• KLEAR SAND CLEAR
  License 1040426 · expires June 30, 2028
• KLONDIKE ROOF CONSTRUCTION SERVICE CLEAR
  License 990645 · expires February 29, 2028
• KNJM CHILLER SERVICES INC CLEAR
  License 1014147 · expires May 31, 2028
• KOGUMA SWEET HOME CLEAR
  License 1150188 · expires February 29, 2028
• KOR GLASS AND DOOR LLC CLEAR
  License 1097600 · expires September 30, 2028
• KORMEX CONSTRUCTION INC CLEAR
  License 1073142 · expires February 28, 2027
• KORNERSTONE CONSTRUCTION CLEAR
  License 1162745 · expires October 31, 2028
• KP BUILDERS CLEAR
  License 983861 · expires May 31, 2027
• KYLE YANG CONSTRUCTION CLEAR
  License 1085591 · expires January 31, 2028
• L D M CONSTRUCTION SERVICES CLEAR
  License 957993 · expires February 28, 2027
• LANDEROS CONSTRUCTION GROUP CLEAR
  License 770655 · expires January 31, 2028
• LARRY METHVIN INSTALLATIONS INC DBA LMI CLEAR
  License 471010 · expires March 31, 2027
• LASSITER CONSTRUCTION CLEAR
  License 758267 · expires January 31, 2027

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