Cornerstone Builders, B General Building Contractor in Lafayette, CA
Cornerstone Builders operating as a sole owner holds an active California contractor license (CSLB #527184), valid through Mar 31, 2028. First issued in 1988, the license has been on the CSLB roster for 38 years. It carries a single CSLB classification: B — General Building Contractor. Records show an active surety bond on file with Business Alliance Insurance Company and an exempt workers' compensation status (no employees on payroll). The business is based in Lafayette, in Contra Costa County, California.
- License Number
- 527184
- Issued
- Mar 25, 1988
- Status
- CLEAR
- Expires
- Mar 31, 2028
- Entity
- Sole Owner
- Surety
- Business Alliance Insurance Company
- Bond Number
- G19033211191
- Effective
- Mar 31, 2026
- Status
- Active
- Coverage
- Exempt
- Carrier
- —
- Policy Number
- —
- Effective
- Feb 26, 2026
- Expires
- —
This contractor warrants a closer look before contracting:
- Workers' comp listed as exempt
An automated summary of public CSLB data, not a credit score, rating, or endorsement. How we determine this
Is Cornerstone Builders licensed in California?
Yes. Cornerstone Builders holds California Contractors State License Board license number 527184, which is active and in good standing. The license was first issued on March 25, 1988. It is valid through March 31, 2028.
What does Cornerstone Builders specialize in?
Cornerstone Builders is licensed for one CSLB classification: B General Building Contractor.
Where is Cornerstone Builders headquartered?
Cornerstone Builders is headquartered at 1170 Oleander Drive, Lafayette, CA 94549, in Contra Costa County, California.
Does Cornerstone Builders have an active surety bond on file with CSLB?
Yes. Cornerstone Builders has an active California contractor surety bond filed with Business Alliance Insurance Company.
Does Cornerstone Builders carry workers' compensation coverage?
Cornerstone Builders reports an exempt workers' compensation status, meaning the business has no employees on payroll.
How do I verify Cornerstone Builders's contractor license?
You can verify Cornerstone Builders's license directly with the California Contractors State License Board at https://www.cslb.ca.gov/OnlineServices/CheckLicenseII/LicenseDetail.aspx?LicNum=527184.
- License issuedMar 25, 1988
- WC coverage startsFeb 26, 2026
- Bond activeMar 31, 2026
- License expiresMar 31, 2028
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