About ADUByCity

ADUByCity covers ADU rules for 100 California cities in one place. We research and verify ADU regulations directly from city planning departments so homeowners can make informed decisions.

Our mission: make ADU information accessible, accurate, and actionable for every California homeowner.

Regulation data is verified from official municipal codes and planning department publications by the ADUByCity Team. Every city page shows when it was last verified. Read how we research and verify ADU rules.