Best Licensed General Contractors in Ontario, CA
273 general contractors registered in Ontario hold current CSLB licenses, verified against official records as of August 22, 2026. The 8 below are the top-ranked, ordered by workers' compensation cover and years licensed.
- 3,667 active B general building contractor licenses in San Bernardino County; 287 registered in Ontario
- 142 of Ontario's 287 licenses (49.5%) carry current workers' compensation cover, not liability insurance; a blank usually means an owner-operator with no employees
- Median time licensed in Ontario: 10 years
- Longest Ontario licensure: since 1972
- 312 county licenses reach their expiration date within 90 days
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- Verified
- August 22, 2026
- Licensed since
- 1975
- Phone
- (909) 947-9467
- Verified
- August 22, 2026
- Licensed since
- 1981
- Phone
- (909) 556-3764
- Verified
- August 22, 2026
- Licensed since
- 1982
- Phone
- (909) 947-4601
- Verified
- August 22, 2026
- Licensed since
- 1985
- Phone
- (909) 923-5844
- Verified
- August 22, 2026
- Licensed since
- 1987
- Phone
- (909) 947-6474
- Verified
- August 22, 2026
- Licensed since
- 1990
- Phone
- (909) 785-5075
- Verified
- August 22, 2026
- Licensed since
- 1990
- Phone
- (909) 947-9820
- Verified
- August 22, 2026
- Licensed since
- 1990
- Phone
- (909) 988-5054
Compare the top 6 at a glance
| Company | License | Workers' comp | Licensed since |
|---|---|---|---|
| Fullmer Construction | #301814 | On file | 1975 |
| Baywood Construction Co | #415687 | On file | 1981 |
| Spec Construction Co Inc. | #419626 | On file | 1982 |
| Correa Construction | #482342 | On file | 1985 |
| M & R Construction Services Inc. | #508404 | On file | 1987 |
| Inter-City Energy Systems Inc. | #587709 | On file | 1990 |
San Bernardino County general building licensure at a glance
California licenses contractors by classification and CSLB publishes one on every record, so supply can be counted exactly: 3,667 active B general building contractor licenses in San Bernardino County, 287 of them registered in Ontario. CSLB also publishes a real original issue date, which Washington's registry does not, so tenure is measurable here: the median Ontario license has been held 10 years, and the longest-standing one dates to 1972. 142 of Ontario's 287 licenses (49.5%) carry current workers' compensation cover in CSLB's file. That is employee injury cover, not liability insurance, and a blank usually means an owner-operator with no employees - lawful, and not a mark against anyone. The contractor bond is not a signal here: 3,666 of the county's 3,667 licenses carry the same $25,000 bond California sets by statute. 312 county licenses reach their expiration date within the next 90 days. CSLB cannot link straight to a license record, so every listing above shows its number for you to type into CSLB's license lookup. How we verify.
General Contractors in Ontario: common questions
How many licensed general contractors are there in Ontario?
287 active B general building contractor licenses are registered in Ontario, out of 3,667 across San Bernardino County. 273 Ontario-registered companies passed our license verification, and the 8 on this page are the top-ranked of those. Only licenses CSLB shows as CLEAR and unexpired are listed.
Does California license general contractors?
Yes. California licenses contractors by classification, and B is the CSLB classification that authorises this work. 287 active B general building contractor licenses are registered in Ontario and 3,667 across San Bernardino County, the longest-standing issued in 1972. Only CLEAR, unexpired licenses appear here.
How do I check a general contractor's license in California?
Every listing above shows its CSLB license number. CSLB cannot link straight to a record, so open its license lookup and type the number in: it shows status, expiration, the contractor bond and workers' compensation cover, which 142 of Ontario's 287 currently carry. 312 San Bernardino County licenses expire within 90 days.
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