Carstens Construction CO
Carstens Construction CO operating as a corporation is licensed in California under CSLB number 305427. The license was first issued in 1975, putting the business at 51 years on the active CSLB roster. It carries a single CSLB classification: B — General Building Contractor. Records show an active surety bond on file with Nationwide Mutual Insurance Company and an exempt workers' compensation status (no employees on payroll). The business is based in San Mateo, in San Mateo County, California.
- License Number
- 305427
- Issued
- May 12, 1975
- Status
- CLEAR
- Expires
- Mar 31, 2028
- Entity
- Corporation
- Surety
- Nationwide Mutual Insurance Company
- Bond Number
- 7901280658
- Effective
- Sep 1, 2025
- Status
- Active
- Coverage
- Exempt
- Carrier
- —
- Policy Number
- —
- Effective
- Mar 24, 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 Carstens Construction CO licensed in California?
Yes. Carstens Construction CO holds California Contractors State License Board license number 305427. The license was first issued on May 12, 1975. It is valid through March 31, 2028.
What does Carstens Construction CO specialize in?
Carstens Construction CO is licensed for one CSLB classification: B General Building Contractor.
Where is Carstens Construction CO headquartered?
Carstens Construction CO is headquartered at 1206-A West Hillsdale Bl, San Mateo, CA 94403, in San Mateo County, California.
Does Carstens Construction CO have an active surety bond on file with CSLB?
Yes. Carstens Construction CO has an active California contractor surety bond filed with Nationwide Mutual Insurance Company.
Does Carstens Construction CO carry workers' compensation coverage?
Carstens Construction CO reports an exempt workers' compensation status, meaning the business has no employees on payroll.
How do I verify Carstens Construction CO's contractor license?
You can verify Carstens Construction CO's license directly with the California Contractors State License Board at https://www.cslb.ca.gov/OnlineServices/CheckLicenseII/LicenseDetail.aspx?LicNum=305427.
- License issuedMay 12, 1975
- Bond activeSep 1, 2025
- WC coverage startsMar 24, 2026
- License expiresMar 31, 2028
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