Simpsonville, SC Accessory Structures: Garage Conversions (2026)

In Greenville County, South Carolina, the Zoning Ordinance preserves the single-family character of residential zoning districts by limiting how garages may be reused. The Greenville County Answer Book on Zoning, published by the Code Enforcement Division, explicitly identifies the prohibition: a property owner may not convert a basement or garage "into a separate apartment." A "separate apartment" in this context means an independent dwelling unit with its own cooking, sleeping, and bathing facilities and a separate entrance — i.e., what is commonly called an accessory dwelling unit (ADU), in-law suite, or rental unit. Creating that kind of unit in a single-family-zoned garage is not permitted county-wide.

The prohibition does not necessarily prevent a homeowner from converting garage space into additional living area that remains an integrated part of the existing single-family dwelling (for example, expanding a family room, home office, or bedroom for the existing household). However, any such interior conversion is a change of use that affects the building's habitable area and almost always requires a Greenville County building permit from the Building Safety Department. The conversion must comply with the South Carolina Residential Code requirements for habitable space, including minimum ceiling heights, natural light and ventilation (or mechanical alternatives), emergency escape and rescue openings (egress windows), smoke and carbon monoxide alarms, energy code compliance for newly conditioned space, and electrical/plumbing/mechanical permits as applicable.

Property owners considering a garage conversion in Greenville County are directed to contact the Code Enforcement Division at 864-467-7425 to confirm what is permitted in their zoning district before beginning work, and to apply for a building permit through the Building Safety Department prior to construction.