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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)
- DUO CAP CONSTRUCTION INC CLEAR
- DVG COSTRUCTION CLEAR
- DYLAN'S PLUMBING GROUP INC CLEAR
- E A PLUMBING INC CLEAR
- E B A GLASSWORKS CLEAR
- E SOLAR COMPANY CLEAR
- EAGLE SIGNS INC CLEAR
- EARTH & STRUCTURAL DEVELOPMENT LLC CLEAR
- EARTHSCAPES CLEAR
- EASTVALE LANDSCAPING INC DBA EASTVALE CONCRETE CLEAR
- EDWARD C MIERAU CLEAR
- EDWARD RUIZ CLEAR
- EFFINA CLEAR
- EG LANDSCAPING CLEAR
- EKNIRA LLC CLEAR
- ELECTRICAL BEST SERVICES INC CLEAR
- ELECTRICAL SERVICES CLEAR
- ELEGANCE MILLWORK Work Comp Susp
- ELEMENTS OF STYLE CLEAR
- ELGIN GUERRERO CLEAR
- ELIAS PLUMBING CLEAR
- ELISEO MIRAMONTEZ CLEAR
- ELITE BUILDING CONTRACTORS INC CLEAR
- ELITE CONSTRUCTION CLEAR
- ELITE DOOR INSTALLATIONS CLEAR
- ELITE PAINTERS INC CLEAR
- ELITE PRECISION AIR SYSTEMS CLEAR
- EMERGENCY GATE SERVICES LLC CLEAR
- EMMONS ROOF SERVICE INC CLEAR
- EMPIRE SHEET METAL INC CLEAR
- EMS RENOVATIONS CLEAR
- ENHANCED ROOFING INC CLEAR
- ENVIROKINETICS INC CLEAR
- ER5 CONSTRUCTION INC CLEAR
- ERIC HURFORD CONSTRUCTION CLEAR
- ERNESTO BARBERI CLEAR
- ERWIN ADVANCED AIR SYSTEMS CLEAR
- ESP CONSTRUCTION SOLUTIONS Liab Ins Susp
- ESPINOZA ROOFING CLEAR
- EVAN IBALDO CASTILLO CLEAR
- EVEN MAS PLASTERING CLEAR
- EVIES INTERNATIONAL INC CLEAR
- EXACTO BUILDERS CLEAR
- EXCELL CONSTRUCTION INC CLEAR
- EXCELLENT BLINDS AND SHUTTERS CLEAR
- EXPERT HARDWOOD FLOORING CLEAR
- EYE ON BUILDERS CLEAR
- F C FORMSETTER & CONCRETE CLEAR
- FAIRCHILD PLUMBING & MECHANICAL INC CLEAR
- FANGWEN HAN CLEAR
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