Garage conversion rules in Union City, CA — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Union City allows converting an existing garage into an accessory dwelling unit under UCMC Chapter 18.34. The conversion is reviewed ministerially with a building permit, and the city cannot require replacement of the off-street parking spaces lost to the conversion.
Chapter 18.34 permits ADUs created within or converted from existing structures, including attached and detached garages. A converted garage ADU is processed ministerially under California ADU law and requires a building permit but no discretionary hearing. ADUs converted entirely from existing floor area are not subject to setbacks. When a garage, carport, or covered parking structure is demolished or converted to create an ADU, the city may not require those off-street parking spaces to be replaced. Standard ADUs created this way have no owner-occupancy requirement. A garage converted to general living space that is not an independent dwelling is handled as a building-permit alteration through the Building Division.
Converting a garage to a dwelling without the required building permit can lead to code-enforcement action, fines, and orders to legalize or reverse the work, plus potential issues at resale.
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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.
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