ADU permit process in Petaluma, California
Last verified August 29, 2026
Prepared by GetYourPermit editorial teamReport an error
This guide includes the portions of the City permit process that passed our evidence review. Confirm project-specific requirements with the City before submitting.
Where to apply
- Department
- Building Division
- Permit portal
- City Online Portal System
Step by step
- 1
Confirm zoning before plans
Speak with City Planner Zoning-compliance guidance
- 2
Submit permit materials
Prepare City-required plans Permit submission
What you need to submit
- Garage conversion plan set
Project-specific next step
Build your Petaluma permit report
Choose your ADU type and size to bring the City process, researched permit fees, and early construction budget into one planning report.
Sources for this guide
Additional city reference pages
The live official City document page identifies the FY2026-27 fee schedule as July 1, 2026 and links its direct PDF.
Accessed August 29, 2026
The current City-hosted fee schedule gives the valuation tiers for Building Permit fees, Building plan-check percentage, and listed supplemental City and State charges.
Accessed August 29, 2026
The live official City FAQ confirms the online ADU permit route and the current City-stated threshold and proportional rule for development impact fees.
Accessed August 29, 2026
The live City page says impact/connection fees are collected by Building Division and directs applicants to Planning for an estimate, while its linked numerical matrix is FY2025-26 rather than current FY2026-27.
Accessed August 29, 2026