GetYourPermit

ADU permit process in Mill Valley, 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
Planning & Building — Building
Permit portal
City Online Portal System
Contact
building@cityofmillvalley.gov

Step by step

  1. 1

    Confirm City jurisdiction and establish eTRAKiT account

    Confirm job site is inside City limits Apply online with existing eTRAKiT account or email City for new account eTRAKiT application access

  2. 2

    Upload complete submittal package

    Prepare complete submittal Upload required documents through eTRAKiT Uploaded building-permit submittal

  3. 3

    City plan review

    Await City review Review result or response request

  4. 4

    Approval and issuance

    Follow City instructions before issuance Issued permit

  5. 5

    Revision after issued permit

    Use City Revision Submittal Form for changes to issued permit Revision submittal

Pre-approved ADU plans

Use Mill Valley’s official page to confirm which designs, site conditions, and supplemental documents qualify. Plan-check timing still depends on the project and city review.

View pre-approved plans

Project-specific next step

Build your Mill Valley permit report

Choose your ADU type and size to bring the City process, researched permit fees, and early construction budget into one planning report.

Start my permit report

Sources for this guide

Additional city reference pages

  • CityForms, Fees & Resources

    Discovery exposed only a fee schedule expressly effective July 1, 2025.

    Accessed August 28, 2026

  • CityBuilding Permit Fees Effective July 1, 2025

    This is an official City schedule with valuation-based permit and plan-check rules, but it expressly became effective July 1, 2025 and cannot prove a current 2026 amount.

    Accessed August 28, 2026

  • CityHow do I determine the valuation of my project?

    The City requires an itemized material/labor breakdown and Cost Evaluation form; the Building Official reviews and approves valuation against Marin County and City market value rates.

    Accessed August 28, 2026

  • CityBuilding FAQ

    The City describes a road-impact assessment at valuation $10,000 or more and a parcel-specific downstream drainage assessment at valuation $5,000 or more, but directs applicants to the Building Counter for the specific parcel.

    Accessed August 28, 2026

  • CityPermit Application Process

    Official source for the current City fee schedule, rule, or verification path.

    Accessed August 28, 2026