County context

Sonoma County Pre-Approved ADU Plans

Browse official city and county pre-approved ADU plan programs in Sonoma County, California.

Source-backed county plan listings

Program Overview

This Sonoma County page summarizes source-backed county context for Sonoma County, California. The current public dataset lists 9 city program pages in this county and 4 county-level accepted-plan records. County-level plan sources include County of Sonoma, Permit Sonoma, and Sonoma County. Provider names include Abodu, Permit Sonoma ADU Ready, and Mayberry Workshop.

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 1 fee record and 7 permit requirement records. Missing source fields remain Not listed in source, and directory records do not guarantee permit approval.

Summary

Location
Sonoma County, California, USA
County-level accepted plans
4 accepted plans
Providers
3 providers
Origin programs
3 programs
Plan size range
610 to 749 sq ft
Permit sources
21 sources

Included Locations

County-Level Accepted Plans

4 plans

Permit Requirements

7 requirements

Unincorporated county

County ADU Ready review

Official county source

County program use remains subject to county site and permit review.

Last checked
Aug 12, 2026
Notes
Not listed in source

Fees

1 fee record

Unincorporated county

ADU Ready plan check

Official county source

Reduced two-hour plan-check treatment for qualifying stick-built pre-reviewed plans; other fees remain.

Source
ADU Fees
Last checked
Aug 12, 2026
Notes
Not listed in source

Official Sources

21 sources