Garage conversion ADUs in Berkeley, CA
A conversion reuses a structure you already have. The city treats it differently from a new building, and a licensed contractor still has to scope and price it.
What the city says about conversions
The city defines a conversion ADU as one made by converting an existing accessory building or structure, or non-livable interior space such as a garage or workshop. Its information sheet says the converted structure may keep its current size and location and any existing nonconformities, provided it meets fire and safety requirements. A conversion that exceeds the usual maximum size is allowed if it makes no changes to the building envelope.
New windows, doors or other openings in a lawful nonconforming structure can be added with a Zoning Certificate. Excavating inside a required setback first needs an Administrative Use Permit. When a garage or covered parking space is replaced by an ADU, an uncovered replacement space is allowed, in any configuration including the front setback, but parking is not required.
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Conversion questions
Do I have to replace the parking?
No. The city says parking is not required for ADUs. If you choose to provide replacement parking, an uncovered space is allowed by right.
Can I convert a garage next to an old unpermitted unit?
The city has an amnesty program for existing unpermitted ADUs. Ask the contractor we connect you with whether your unit qualifies.
Ask a licensed ADU contractor to follow up
Send a request with your address and whether you are thinking of a detached unit, a garage conversion, or a junior ADU. We pass your request to one independent licensed contractor who serves Berkeley, CA, if one is available.
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