Garage conversion rules in Sunol, CA — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Garage conversions to ADUs in unincorporated Sunol are governed by Alameda County Code Title 17, Chapter 17.55 (adopted 2024) and California Government Code §65852.2. No replacement parking is required when a garage is converted, and the existing garage's setbacks are preserved. Most Sunol parcels are on septic systems requiring Alameda County Environmental Health review.
Under Alameda County Code §17.55 and state ADU law, no replacement parking is required when an existing garage is converted to an ADU or JADU. The existing footprint and setbacks of the garage are preserved for the conversion; any added square footage beyond the original walls must meet the 4-foot side and rear setbacks for new construction. A JADU created in an attached garage is capped at 500 sq ft and must be within the walls of the primary single-family dwelling, with owner-occupancy of either the primary or JADU recorded by deed restriction. Building permits are issued by the Alameda County Building Inspection Department and must meet the California Residential Code (egress, 7-foot ceiling height, light/ventilation, smoke and CO alarms, fire separation). Because most Sunol parcels are on septic and well, Alameda County Environmental Health must review the septic capacity for the added bedroom load. Site Development Review is not required unless there is a safety concern.
Converting a Sunol garage to habitable space without a building permit is a violation of Alameda County Code Title 17 and the California Residential Code, with stop-work orders, daily fines, and required after-the-fact permits or restoration. Septic installations without Environmental Health approval are separately citable.
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Side-by-side rule comparisons with other cities in Alameda County.
See how other cities in Alameda County handle garage conversions.
See how Sunol's garage conversions rules stack up against other locations.
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