Learn about building an ADU in Marin County
Strengthen our community and create flexibility for your family
Phases of ADU Development
Feasibility Consultations
The best way to start your project – get a customized feasibility report for your property so you know what’s possible and where to begin.
Note: Consults are available in member communities – see our Contact page for details.
Get Inspired
Check out floorplans, see photos, and learn more from your neighbors who are building ADUs.
“
Having a wonderful tenant and seeing the life it brings to her and us, made this really worth it.”
Jane and Doug, Mill Valley, ADU owner
ADU Stories →
Read about people in your community who have built ADUs
Floorplans Inspiration →
See layouts for dozens of real ADUs from across California
Browse Resources
Read our comprehensive workbook, estimate your budget with our calculator, and use our other tools to support your project.
Get Expert Advice
ADU Webinars Library
ADU Blog
Check out our blog, with tools, tips, news, and all the latest updates.
Ready to ADU?
Take the first steps →
Getting Started
