ADU rules in Simpsonville, SC — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Simpsonville's Zoning Ordinance sharply limits ADUs. Under Section 3.3.4, an accessory dwelling unit may only be placed on stories above the ground floor of a nonresidential building (or in an approved live-work arrangement). There is no by-right detached backyard ADU/granny-flat allowance for single-family lots.
Section 3.3.4 ("Dwelling, Accessory") governs ADUs. Unlike cities with liberal backyard-cottage rules, Simpsonville confines accessory dwellings to upper floors of nonresidential buildings and requires shared walls/floors between residential and nonresidential uses to be built to minimize noise and vibration transmission. Mobile homes, recreational vehicles, and travel trailers may never be used as accessory dwelling units (definitions section). All accessory uses must be subordinate to the principal use and located on the same lot. Because a detached backyard ADU is not a listed accessory use for single-family districts, homeowners wanting a rentable second unit should confirm district and use eligibility with the Planning Department before building.
Building or occupying an unpermitted dwelling violates the Zoning Ordinance; the City may withhold permits, issue stop-work orders, and require removal. Penalties follow Code section 1-9.
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