California contractor license
WILLIAM O'BRIEN & SONS
- B General Building
WILLIAM O'BRIEN & SONS is a B General Building contractor in Burlingame, San Mateo County, licensed in California for 52 years (since 1974). As of Feb 25, 2026, the license is active with an expiration date of Feb 28, 2027 on record and a license bond is on file.
WILLIAM O'BRIEN & SONSB General Building · checked Feb 25, 2026
ActiveLicense number#292934
Licensed sinceApr 11, 1974
Years licensed52 years
Expiration on recordFeb 28, 2027
City and countyBurlingame, San Mateo County
License bondOn file
ProjectsNone on file
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Source: California Contractors State License Board (CSLB) and City of Los Angeles permit records. Last updated Feb 25, 2026.