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Wondering if your community has pre-approved ADU plans? See more details here

Wondering if your community has pre-approved ADU plans? See more details here

A project of the Santa Clara County Planning Collaborative

How large can my ADU be?

According to state law, you can build up to an 800 square foot ADU, as long as it is not over 16 feet tall and rear and side setbacks are 4 feet or more. Otherwise, size limits depend on your property and local rules. No room behind or next to your main home? You can build it in your front yard instead.

Get all your questions answered.