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Building Safety in San Mateo County, CA (2026)

2 county-level rules, plus city-specific rules for 1 city in San Mateo County, California.

Verified from official government sources

Note: These county rules apply to unincorporated areas of San Mateo County. If you live within an incorporated city, that city's own rules apply: see the city list below.

Childcare Center Rules

Unincorporated San Mateo County child care centers eligible for a ministerial permit must pass a fire safety inspection to Building Inspection Section standards before opening.

San Mateo County Child Care Center Fire Safety

Some Restrictions

San Mateo County Zoning Regulations § 8.372.060(A)(1)(b)

The facility shall comply with all applicable State and County regulations, including completing a fire safety inspection to the standards set by the Building Inspection Section. Where County and State requirements conflict, State requirements shall apply. c. The facility shall comply with any applicable Airport Land Use Plan. ...

Building Permits

In unincorporated San Mateo County, the Planning Director can exempt interior remodels, repairs and minor exterior work from the discretionary site development permit, though a standard building permit is still required.

San Mateo County Interior Remodel Permit Exception

Some Restrictions

San Mateo County Zoning Regulations § 8.308.100

The Director or designee may except minor activities which otherwise require a site development permit from the requirements of this Chapter when such activities, in the judgment of the Director, are minor in nature and will not have an adverse effect on compliance with design standards or guidelines or zoning regulations applicable to the property or structure in question. Minor projects inclu...

Building Safety by City in San Mateo County

1 cities in San Mateo County have their own building safety rules. Each link goes to that city's dedicated page with code citations.

All San Mateo County ordinances

See every category we cover for San Mateo County: parking, noise, fences, fires, animals, pools, and more.

San Mateo County Ordinance Hub →