Garage conversion rules in Simpsonville, SC — sometimes called garage-to-ADU or accessory living unit conversions — govern permits, ceiling height, egress, and parking replacement.
Simpsonville's Zoning Ordinance has no special garage-conversion allowance. Converting a garage into living space is a change of use of a structure that triggers a building permit under Chapter 8; it may not create a second dwelling unit, since accessory dwelling units are limited to upper floors of nonresidential buildings
The Zoning Ordinance treats any change in the use or occupancy of a building as regulated activity requiring compliance and permits (Sec. 7.7.1). A garage-to-habitable-room conversion within a single-family home is generally allowed as long as it meets building-code and off-street-parking requirements, but it cannot be used to create a separate rentable dwelling because Section 3.3.4 restricts accessory dwelling units to stories above the ground floor of nonresidential buildings. Building-permit and inspection requirements are administered through the Building/Codes division under Chapter 8 (Buildings and Building Regulations) and the South Carolina building codes. Homeowners should verify parking and setback compliance before converting.
An unpermitted conversion or an illegal second unit is a code violation; the City may issue stop-work orders, withhold certificates of occupancy, and require reversal. Penalties follow Code section 1-9.
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