ADU rules in Spartanburg County, SC — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
In areas governed by the Unified Land Management Ordinance, a single detached accessory dwelling unit (ADU) is permitted so long as it is no larger than one-third of the principal home's floor area and meets the Table 3 dimensional and setback requirements.
Spartanburg County's ULMO governs the unzoned/ULMO portion of the unincorporated county. Section 3.05 permits one detached accessory dwelling unit provided it does not exceed one-third of the principal dwelling's floor area, meets all Table 3 setback and lot requirements, and other public agencies (septic, building codes) are satisfied. A second residential structure requires prior county approval before any address is assigned or building permit issued. The Southwest Planning Area follows the separate Performance Zoning Ordinance instead. Incorporated cities such as Spartanburg, Greer, and Duncan set their own ADU rules. Contact Planning & Development (864-596-3570) to confirm which ordinance applies to your parcel.
Building or occupying a second dwelling or ADU without prior county approval and a building permit is a zoning violation subject to stop-work orders and County enforcement.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Spartanburg County's adu rules rules stack up against other locations.
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