Garage conversion rules in Dorchester County, SC — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Converting a garage to living space in Dorchester County is a change of occupancy needing a building permit under the 2021 SC Residential Code. Adding a bathroom or bedroom on septic triggers SCDES review under Regulation 61-56.
A garage conversion turns non-habitable space into a habitable room, so Dorchester County Building Services permits it under the adopted 2021 SC Residential Code and inspects egress, ceiling height, insulation, and smoke and carbon-monoxide alarms; new wiring needs a SC-licensed electrical contractor. The converted space must still satisfy zoning, and most districts expect replacement off-street parking. Where the work adds a bathroom or bedroom and the lot is on septic, SCDES Regulation 61-56 governs the added load, because the onsite system is sized by bedroom count and may need to be expanded.
Converting a garage to a bedroom without a permit is illegal habitable construction. Adding a bathroom on septic without SCDES approval violates Regulation 61-56.
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