A project of the Solano County Planning Collaborative


How large can my ADU be?

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

See the Learning the Rules guide for more details.

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