Dittmann Plumbing INC, C-36 Plumbing Contractor in San Mateo, CA
Dittmann Plumbing INC operating as a corporation holds California contractor license #311169, which is currently expired (lapsed Sep 30, 2026) and not valid to contract until it is renewed. First issued in 1975, the license has been on the CSLB roster for 51 years. It carries a single CSLB classification: C-36 — Plumbing Contractor. Records show an active surety bond on file with Atlantic Specialty Insurance Company and active workers' compensation coverage from Employers Preferred Insurance Company. The business is based in San Mateo, in San Mateo County, California.
- License Number
- 311169
- Issued
- Oct 14, 1975
- Status
- CLEAR
- Expires
- Sep 30, 2026
- Entity
- Corporation
- Surety
- Atlantic Specialty Insurance Company
- Bond Number
- 800233272
- Effective
- Apr 11, 2026
- Status
- Active
- Coverage
- Workers' Compensation Insurance
- Carrier
- Employers Preferred Insurance Company
- Policy Number
- EIG538929502
- Effective
- Nov 16, 2025
- Expires
- Nov 16, 2026
This contractor has a compliance issue in its public CSLB record:
- License expired
An automated summary of public CSLB data, not a credit score, rating, or endorsement. How we determine this
Is Dittmann Plumbing INC licensed in California?
Dittmann Plumbing INC previously held California Contractors State License Board license number 311169, but the license expired on September 30, 2026 and is not currently valid. It was first issued on October 14, 1975.
What does Dittmann Plumbing INC specialize in?
Dittmann Plumbing INC is licensed for one CSLB classification: C-36 Plumbing Contractor.
Where is Dittmann Plumbing INC headquartered?
Dittmann Plumbing INC is headquartered at 941 South Claremont Street, San Mateo, CA 94402, in San Mateo County, California.
Does Dittmann Plumbing INC have an active surety bond on file with CSLB?
Yes. Dittmann Plumbing INC has an active California contractor surety bond filed with Atlantic Specialty Insurance Company.
Does Dittmann Plumbing INC carry workers' compensation coverage?
Yes. Dittmann Plumbing INC carries active workers' compensation coverage through Employers Preferred Insurance Company.
How do I verify Dittmann Plumbing INC's contractor license?
You can verify Dittmann Plumbing INC's license directly with the California Contractors State License Board at https://www.cslb.ca.gov/OnlineServices/CheckLicenseII/LicenseDetail.aspx?LicNum=311169.
- License issuedOct 14, 1975
- WC coverage startsNov 16, 2025
- Bond activeApr 11, 2026
- License expiredSep 30, 2026
- WC expiresNov 16, 2026
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