Best Licensed General Contractors in Thornton, CA
8 general contractors registered in Thornton hold current CSLB licenses, verified against official records as of August 22, 2026. All 8 are listed below, ordered by workers' compensation cover and years licensed.
- 1,182 active B general building contractor licenses in San Joaquin County; 8 registered in Thornton
- 3 of Thornton's 8 licenses (37.5%) carry current workers' compensation cover, not liability insurance; a blank usually means an owner-operator with no employees
- Median time licensed in Thornton: 2 years
- Longest Thornton licensure: since 1994
- 85 county licenses reach their expiration date within 90 days
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- Verified
- August 22, 2026
- Licensed since
- 1994
- Phone
- (925) 525-6311
- Verified
- August 22, 2026
- Licensed since
- 1995
- Phone
- (209) 810-2071
- Verified
- August 22, 2026
- Licensed since
- 2025
- Phone
- (510) 909-9103
- Verified
- August 22, 2026
- Licensed since
- 1998
- Phone
- (209) 794-0175
- Verified
- August 22, 2026
- Licensed since
- 2021
- Phone
- (510) 917-9344
- Verified
- August 22, 2026
- Licensed since
- 2024
- Phone
- (209) 244-2716
- Verified
- August 22, 2026
- Licensed since
- 2024
- Phone
- (209) 747-4874
- Verified
- August 22, 2026
- Licensed since
- 2025
- Phone
- (209) 612-9735
Compare the top 6 at a glance
| Company | License | Workers' comp | Licensed since |
|---|---|---|---|
| R A Jones Construction | #694892 | On file | 1994 |
| Quality Landscape | #714914 | On file | 1995 |
| Unity Contractors Inc. | #1135559 | On file | 2025 |
| Swinyard Construction | #752085 | Exempt or none on file | 1998 |
| E M D Construction | #1078264 | Exempt or none on file | 2021 |
| Alas Constructor | #1118558 | Exempt or none on file | 2024 |
San Joaquin 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: 1,182 active B general building contractor licenses in San Joaquin County, 8 of them registered in Thornton. CSLB also publishes a real original issue date, which Washington's registry does not, so tenure is measurable here: the median Thornton license has been held 2 years, and the longest-standing one dates to 1994. 3 of Thornton's 8 licenses (37.5%) 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: 1,181 of the county's 1,182 licenses carry the same $25,000 bond California sets by statute. 85 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 Thornton: common questions
How many licensed general contractors are there in Thornton?
8 active B general building contractor licenses are registered in Thornton, out of 1,182 across San Joaquin County. 8 Thornton-registered companies passed our license verification, and all 8 are listed on this page. 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. 8 active B general building contractor licenses are registered in Thornton and 1,182 across San Joaquin County, the longest-standing issued in 1994. 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 3 of Thornton's 8 currently carry. 85 San Joaquin County licenses expire within 90 days.