County government
Planning & Building
San Mateo County building permit services. Confirm which county or city agency handles your property before applying.
County building permit information (opens in a new tab)Official instructions
Official county building permit guidance. Service boundaries and project requirements must be confirmed with the department.
How to get started
- Confirm which county or city agency handles the property before applying.
- Review the official requirements for your project and use the published application channel.
Source & saved evidence
San Mateo County · San Mateo — building permit department (opens in a new tab)
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Agent source review: October 14, 2026 · Snapshot 99e6105a669d05d3