J Gerstenkorn Builders, B General Building Contractor in South San Francisco, CA
J Gerstenkorn Builders operating as a corporation holds an active California contractor license (CSLB #1064688), valid through Mar 31, 2028. First issued in 2020, the license has been on the CSLB roster for 6 years. It carries a single CSLB classification: B — General Building Contractor. Records show an active surety bond on file with Western Surety Company and active workers' compensation coverage from American Casualty Company of Reading PA. The business is based in South San Francisco, in San Mateo County, California.
- License Number
- 1064688
- Issued
- Mar 25, 2020
- Status
- CLEAR
- Expires
- Mar 31, 2028
- Entity
- Corporation
- Surety
- Western Surety Company
- Bond Number
- 6767363
- Effective
- Feb 18, 2026
- Status
- Active
- Coverage
- Workers' Compensation Insurance
- Carrier
- American Casualty Company of Reading PA
- Policy Number
- WC8035664513
- Effective
- Sep 15, 2025
- Expires
- Sep 15, 2026
This contractor is verified, with no adverse conditions in the current CSLB record.
An automated summary of public CSLB data, not a credit score, rating, or endorsement. How we determine this
Is J Gerstenkorn Builders licensed in California?
Yes. J Gerstenkorn Builders holds California Contractors State License Board license number 1064688, which is active and in good standing. The license was first issued on March 25, 2020. It is valid through March 31, 2028.
What does J Gerstenkorn Builders specialize in?
J Gerstenkorn Builders is licensed for one CSLB classification: B General Building Contractor.
Where is J Gerstenkorn Builders headquartered?
J Gerstenkorn Builders is headquartered at 668 Railrod Ave Unit C, South San Francisco, CA 94080, in San Mateo County, California.
Does J Gerstenkorn Builders have an active surety bond on file with CSLB?
Yes. J Gerstenkorn Builders has an active California contractor surety bond filed with Western Surety Company.
Does J Gerstenkorn Builders carry workers' compensation coverage?
Yes. J Gerstenkorn Builders carries active workers' compensation coverage through American Casualty Company of Reading PA.
How do I verify J Gerstenkorn Builders's contractor license?
You can verify J Gerstenkorn Builders's license directly with the California Contractors State License Board at https://www.cslb.ca.gov/OnlineServices/CheckLicenseII/LicenseDetail.aspx?LicNum=1064688.
- License issuedMar 25, 2020
- WC coverage startsSep 15, 2025
- Bond activeFeb 18, 2026
- WC expiresSep 15, 2026
- License expiresMar 31, 2028
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