The San Mateo County ADU Resource Center

The ADU Resource Center provides information, resources and tools to make it easier and less expensive for homeowners to build ADUs in San Mateo County. The Center is funded by member  jurisdictions of San Mateo County, the San Francisco Foundation, the Silicon Valley Community Foundation and Home for All. 

IN THE NEWS Read the press release to learn more about the launch of the ADU Resource Center.

Your free go-to guide to all things ADU

Our ADU Guidebook provides step-by-step guidance through the ADU process, from inspiration to move-in.

Family standing in front of their ADU.

Building an ADU is an investment for your family and your community

A home as you age

Housing friends and relatives

Environmental Benefits

Rental Income

Safety

Community support and Workforce Housing

Get Inspired

Woman standing at the entrance to her ADU

ADU Stories

Read about people in your community who have built ADUs

Floorplan for a 1 bedroom detached ADU

Floorplans Inspiration

See layouts for dozens of real ADUs from across California

I love it. It’s the perfect amount of space. I wouldn’t trade it for anything.”

Veronica, Pacifica, ADU owner

It provides peace of mind, knowing that our tenants are nearby to keep an eye on things when we’re away. We have no problem renting out the second unit, since it’s located near major employers.”

Surinder, Menlo Park, ADU owner

Frequently Asked Questions

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