Garage conversion rules in Anne Arundel County, MD — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Anne Arundel County allows garage conversions to habitable space with a building permit. Conversions creating a separate dwelling unit are classified as ADUs. Off-street parking replacement may be required if parking was part of zoning compliance.
Converting a garage to living space in Anne Arundel County requires a building permit and must meet residential building code (insulation, egress, electrical, HVAC, fire separation). If the conversion creates a separate dwelling unit with its own kitchen and independent entrance, it is classified as an ADU and must comply with county ADU rules (max 800 sq ft, owner occupancy). If the garage provided required off-street parking under the zoning code, replacement parking may be required on the lot. Historic structures must be carefully evaluated. HOA approval is required in most organized communities for any exterior changes.
Unpermitted conversion: stop-work order and retroactive permit required. Unauthorized ADU: $500/day until permitted.
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See how Anne Arundel County's garage conversions rules stack up against other locations.
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