Garage conversion rules in York 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 York County is a change of occupancy needing a building permit under the 2021 SC Residential Code. Adding a bathroom or bedroom on septic triggers SCDHEC approval under Regulation 61-56.
A garage conversion turns non-habitable space into a habitable room, so York County Planning & Development Services permits it under the adopted 2021 SC Residential Code and inspects egress, ceiling height, insulation, and smoke and carbon-monoxide alarms; new wiring and plumbing draw their own trades, with a SC-licensed electrical contractor doing the wiring. The converted space must still meet zoning. Where the work adds a bathroom or bedroom and the lot is on septic, SCDHEC Regulation 61-56 governs the added load, since the onsite system is sized by bedroom count and may need expansion.
Converting a garage to a bedroom without a permit is illegal habitable construction. Adding a bathroom on septic without SCDHEC approval violates Regulation 61-56.
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