ADU rules in Rock Hill, SC β also called accessory dwelling unit regulations or granny flat ordinances β cover setbacks, owner-occupancy, parking, and permit requirements.
Rock Hill is the county seat of York County, South Carolina (population approximately 75,000), regulating accessory dwelling units through Chapter 31 (Zoning) of its Code of Ordinances. South Carolina has no statewide ADU preemption statute equivalent to California Government Code Β§66313 or Oregon ORS 197.312, so whether an ADU is permitted in Rock Hill is determined entirely by the local zoning ordinance under planning and zoning authority granted to South Carolina municipalities by the Local Government Comprehensive Planning Enabling Act of 1994 at S.C. Code Β§6-29-310 et seq. Chapter 31 sets ADU permissibility (whether by right, by special exception through the Board of Zoning Appeals, or prohibited), size, height, setbacks, and any owner-occupancy requirements by district. The Rock Hill Code on Municode is the controlling local source: https://library.municode.com/sc/rock_hill.
South Carolina grants planning and zoning authority to municipalities through the Local Government Comprehensive Planning Enabling Act of 1994, codified at S.C. Code Β§6-29-310 et seq. The Act authorizes adoption of comprehensive plans (Β§6-29-510), creation of local planning commissions (Β§6-29-340), zoning ordinances (Β§6-29-720), and boards of zoning appeals (Β§6-29-780). Rock Hill exercises this authority through Chapter 31 of its Code of Ordinances, which is the city's zoning ordinance and is hosted on Municode along with the rest of the Code. Chapter 31 divides the city into residential districts (typically single-family, two-family, and multi-family categories) plus commercial, industrial, and mixed-use districts. Whether an ADU is permitted in a given district, whether it must be attached or may be detached, minimum and maximum unit size, off-street parking requirements, owner-occupancy obligations, and any rental restrictions are all set by Chapter 31. The Rock Hill Planning Commission, established under S.C. Code Β§6-29-340, hears special exception applications referred to it and makes recommendations on zoning amendments to City Council. The Board of Zoning Appeals hears variances and special exceptions under S.C. Code Β§6-29-790. Because South Carolina has not enacted ADU preemption, there is no statutory ministerial-approval requirement, no state-mandated unit size minimum, and no statewide ban on owner-occupancy or rental restrictions. Property owners should consult Chapter 31 and the Rock Hill Planning and Development Department for a written zoning determination before designing an ADU. Building construction must additionally comply with the South Carolina-adopted International Residential Code under S.C. Code Β§6-9-50 (state building codes), which makes the IRC/IBC mandatory minimums for South Carolina municipalities.
Constructing or occupying an unpermitted ADU in Rock Hill is a zoning violation enforceable under S.C. Code Β§6-29-950 and Chapter 31's enforcement provisions. The Rock Hill Planning and Development Department issues notices of violation and may seek civil penalties, injunctive relief in York County Court of Common Pleas, and removal of unpermitted structures. Unpermitted construction additionally violates the state-adopted IRC under S.C. Code Β§6-9-10 et seq., triggering stop-work orders from the Rock Hill Building Official. Continuing violations are typically treated as separate offenses for fine purposes under Chapter 31.
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