Garage conversion rules in Sunnyvale, CA — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Sunnyvale allows garage conversions to ADUs or JADUs under state law. Detached garage ADUs are ministerial. Replacement parking is no longer required under California AB 68 and updated ADU rules.
Garage conversions to ADUs or JADUs are permitted in Sunnyvale under California Government Code Section 65852.2 and the city ADU ordinance. A JADU converted from an existing attached garage up to 500 square feet is ministerial with no additional parking required. An ADU converted from a detached garage is also ministerial, and the former garage footprint can be expanded up to 150 square feet for ingress and egress. California AB 68 removed the requirement to replace garage parking when converting to an ADU, making projects more feasible on small lots. Building permits are required and must address electrical, plumbing, insulation, egress, and fire separation. Converting a garage to living space without a permit is a common code enforcement issue in Sunnyvale and leads to orders to legalize or restore.
Contact your local code enforcement office for specific penalty information.
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Side-by-side rule comparisons with other cities in Santa Clara County.
See how other cities in Santa Clara County handle garage conversions.
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