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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)
- GOODFELLAS ELECTRIC INC CLEAR
- GR QUALITY DRYWALL CLEAR
- GRACE PRO ROOFING INC CLEAR
- GRACE ROOTER AND PLUMBING CLEAR
- GREEN REMODEL SOLUTIONS CLEAR
- GREGG ELECTRIC INC CLEAR
- GREGORY ALAN HAYDEL CLEAR
- GROUNDBREAKING DESIGN BUILDING CLEAR
- GUENTHER WOODWORKS AND STAIRS CLEAR
- GUERRERO FIRE PROTECTION INC CLEAR
- H & M FENCE CLEAR
- H SEPTIC CLEAR
- HANDLE IT COATINGS INC CLEAR
- HASSON'S LANDSCAPING CLEAR
- HAVEN KING CONSTRUCTION CLEAR
- HB CONSTRUCTION CLEAR
- HCI SPRINKLER INC CLEAR
- HCI SYSTEMS INC CLEAR
- HDC CONSTRUCTION INC CLEAR
- HDZ CONSTRUCT INC CLEAR
- HDZ CONSTRUCTION INC CLEAR
- HERITAGE DESIGN & BUILD LLC CLEAR
- HERITAGE DESIGN BUILD AND CONSULTING CLEAR
- HERNANDEZ POWERS & LIGHTING CLEAR
- HERNANDEZ WROUGHT IRON INC CLEAR
- HERO COATINGS CLEAR
- HERRON CONSTRUCTION INC CLEAR
- HHS CONSTRUCTION LLC CLEAR
- HIDALGO'S ROOFING CLEAR
- HIGH CALIBER DOCK AND DOORS CLEAR
- HIGH PROFILE SYNTHETICS CLEAR
- HIGH QUALITY GROUP CLEAR
- HIGH RIDGE CONSTRUCTION INC CLEAR
- HIGH SPEED ROOTER AND PLUMBING INC CLEAR
- HILLWOOD CONSTRUCTION SERVICES OF CALIFORNIA L P CLEAR
- HIYAWILL CONSTRUCTION INC CLEAR
- HO SOO YOO CLEAR
- HOLMES POOL SERVICE CLEAR
- HOSTETLER CONSTRUCTION CLEAR
- HPS CONSTRUCTION Work Comp Susp
- HR GARCIA CONSTRUCTION INC CLEAR
- HY GLOBAL LLC CLEAR
- HYDROGEN CONSTRUCTION CLEAR
- IBARRA ELECTRIC CLEAR
- ICS INTELESYS INC CLEAR
- IDEAL PRODUCTS INC CLEAR
- IE ROOF EXPERTS CLEAR
- IEGB HOME BUILDERS INC CLEAR
- IMPACT WELDING CLEAR
- IN AND OUT PLUMBING CLEAR
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