County context

San Mateo County ADU Plan Context

San Mateo County currently has no direct county-level accepted ADU plan records in this directory. Use the supported city links below to browse city accepted-plan listings and county context.

County context with city links

Program Overview

This San Mateo County page summarizes source-backed county context for San Mateo County, California. The current export does not list county-level accepted plan records; it keeps this page for county context and links to 1 city program page where source-backed city pages exist.

County records may apply only in unincorporated areas or county-administered jurisdictions, so verify the official source before relying on a plan for an incorporated city. County fee and permit data includes 0 fee records and 2 permit requirement records. Missing source fields remain Not listed in source, and directory records do not guarantee permit approval.

Summary

Location
San Mateo County, California, USA
County-level accepted plans
0 accepted plans
Providers
0 providers
Origin programs
0 programs
Plan size range
Not listed in source
Permit sources
4 sources

Included Locations

County-Level Accepted Plans

0 plans

No county-level accepted plans listed

This county page has no direct county-level accepted plan records in the current data export. Use the included city links on this page to review city-specific accepted-plan listings.

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Permit Requirements

2 requirements

Unincorporated county

Unincorporated County applicability

Official county source

County ADU regulations and permits apply only in unincorporated San Mateo County, not within incorporated cities.

Last checked
Jul 28, 2026
Notes
The target City of San Mateo is an incorporated city.

Unincorporated county

County ADU permit review

Official county source

Projects in unincorporated County jurisdiction require the County's ADU/building permit process and property-specific review.

Last checked
Jul 28, 2026
Notes
This requirement is not a City of San Mateo rule.

Fees

0 fee records

No fee records listed

This location has no fee records in the current data export.

Official Sources

4 sources