ADU builder in Contra Costa County

Planning and building review for unincorporated parcels

The Department of Conservation and Development's Planning and Building Divisions handle county ADU review. The county's published process calls for Planning approval before a building permit. Review both checklists with staff for an unincorporated property rather than using a neighboring city's forms.

Bayshore, hills and inland valley lots

A Richmond-area property, a hillside lot near the central county and a backyard in the inland valleys can have very different access and drainage needs. We assess the usable footprint, utility connections and route for construction before proposing a detached ADU or conversion.

A city name in a mailing address does not by itself establish city jurisdiction. For a property near an incorporated boundary, verify the parcel's jurisdiction and applicable county requirements before design work advances.