Garage conversion rules in Mountain View, CA — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Converting a garage to living space or ADU in Mountain View is allowed with permits. State ADU law waives replacement parking when the garage is converted to an ADU.
Mountain View permits garage conversions into habitable space, home offices, or ADUs subject to the California Residential Code, Title 24 energy standards, and local zoning. A building permit is required for the conversion, including changes to framing, insulation, ceiling height minimum 7 feet, egress windows in bedrooms, smoke and CO alarms, heating, and ventilation. Under California Government Code 65852.2 the city cannot require replacement off-street parking when a garage is converted to an ADU, even if the property is in a transit district or historic area, except in very narrow circumstances. When a garage is converted to habitable space that is not an ADU, replacement parking may be required by the zoning code. Flood and seismic upgrades may apply to older structures.
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.
See how Mountain View's garage conversions rules stack up against other locations.
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