Contractor License Proof

O'Brien Frank J

Licensed

Verified against CSLB on · View on CSLB

License details

License number
343837
Status
Active
Classifications
B · General BuildingC-10 · ElectricalC-36 · Plumbing
Contractor bond
$25,000
Workers' comp
ExemptNo employees — not a red flag.
License term on file
September 13, 1977 – January 31, 2027

Business

  • (415) 987 5903 (CSLB public record)
  • 1579-35TH AVE, San Francisco, CA 94122San Francisco County

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Frequently asked questions

Is O'Brien Frank J licensed in California?

Yes. O'Brien Frank J holds an active California state contractor license (CSLB #343837), verified against the CSLB public record on June 17, 2026.

What is O'Brien Frank J's CSLB license number?

O'Brien Frank J's California contractor license number is 343837. Look that number up with the CSLB "Check a License" tool to confirm its current status against the public record yourself.

What kind of work is O'Brien Frank J licensed for?

O'Brien Frank J is classified under General Building (B), Electrical (C-10), and Plumbing (C-36) by the CSLB.

How do I verify O'Brien Frank J's license myself?

Look up license #343837 with the CSLB "Check a License" tool and compare the status, bond, and workers' compensation details against what's shown on this page. This page reflects the CSLB public record as of June 17, 2026.

Verify it yourself: How to verify a California contractor license · Look up #343837 on CSLB

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See an error in this record? Report incorrect information. Status reflects CSLB data as of the date shown above.