Sinnott Pat Construction, A General Engineering Contractor in Mill Valley, CA
Sinnott Pat Construction operating as a sole owner holds an active California contractor license (CSLB #637437), valid through Feb 29, 2028. First issued in 1992, the license has been on the CSLB roster for 34 years. It carries 2 CSLB classifications: A General Engineering Contractor and B General Building Contractor. Records show an active surety bond on file with Atlantic Specialty Insurance Company and an exempt workers' compensation status (no employees on payroll). The business is based in Mill Valley, in Marin County, California.
- License Number
- 637437
- Issued
- Feb 8, 1992
- Status
- CLEAR
- Expires
- Feb 29, 2028
- Entity
- Sole Owner
- Surety
- Atlantic Specialty Insurance Company
- Bond Number
- 800230136
- Effective
- Feb 6, 2026
- Status
- Active
- Coverage
- Exempt
- Carrier
- —
- Policy Number
- —
- Effective
- Jan 29, 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 Sinnott Pat Construction licensed in California?
Yes. Sinnott Pat Construction holds California Contractors State License Board license number 637437, which is active and in good standing. The license was first issued on February 8, 1992. It is valid through February 29, 2028.
What does Sinnott Pat Construction specialize in?
Sinnott Pat Construction is licensed for 2 CSLB classifications: A General Engineering Contractor and B General Building Contractor.
Where is Sinnott Pat Construction headquartered?
Sinnott Pat Construction is headquartered at 766 Lovell Avenue, Mill Valley, CA 94941, in Marin County, California.
Does Sinnott Pat Construction have an active surety bond on file with CSLB?
Yes. Sinnott Pat Construction has an active California contractor surety bond filed with Atlantic Specialty Insurance Company.
Does Sinnott Pat Construction carry workers' compensation coverage?
Sinnott Pat Construction reports an exempt workers' compensation status, meaning the business has no employees on payroll.
How do I verify Sinnott Pat Construction's contractor license?
You can verify Sinnott Pat Construction's license directly with the California Contractors State License Board at https://www.cslb.ca.gov/OnlineServices/CheckLicenseII/LicenseDetail.aspx?LicNum=637437.
- License issuedFeb 8, 1992
- WC coverage startsJan 29, 2026
- Bond activeFeb 6, 2026
- License expiresFeb 29, 2028
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