Garage conversion rules in Manchester, NH — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Manchester requires permits for garage conversions to living space. NH building codes under RSA 674:51 apply, and conversions must meet habitable space standards for insulation, egress, and fire safety.
Manchester garage conversions to living space require a building permit and must meet habitable space standards. Conversions must include proper insulation, heating, ventilation, electrical upgrades, and emergency egress windows. Fire separation between the converted space and any remaining garage area must meet code. Plumbing additions for bathrooms or kitchens require separate permits. Minimum ceiling height for habitable space is typically 7 feet. Converting a garage to an ADU must comply with RSA 674:71 to 73 requirements. Parking replacement may be required if the conversion eliminates required off-street parking spaces. Energy code compliance is required for the conversion. NH's ADU law may facilitate garage conversions by ensuring municipalities cannot prohibit residential conversions outright.
Unpermitted conversion: stop-work order, retroactive permit required. Unsafe conditions: immediate correction order. Habitation without certificate of occupancy: vacate order.
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See how Manchester's garage conversions rules stack up against other locations.
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