An accessory dwelling unit in Rock Hill requires permits from two municipal tracks: a zoning permit or special exception through the Planning and Development Department confirming the ADU is permitted in the district under Chapter 31 of the Code of Ordinances, and a building permit from the Rock Hill Building Official under the state-adopted International Residential Code per S.C. Code Β§6-9-10 et seq. South Carolina has no statewide ADU preemption like California's SB 9 or Oregon's HB 2001, so timelines, fees, hearing requirements, and approval criteria are set entirely by Rock Hill pursuant to S.C. Code Β§6-29-310 et seq. and applicable local ordinances.
The two-track permitting process for a Rock Hill ADU works as follows. Zoning Track: The applicant first verifies that an ADU is permitted in the underlying district under Chapter 31. If permitted by right, a zoning permit issues from Planning and Development upon a showing of compliance with dimensional standards. If permitted by special exception, the application goes to the Rock Hill Board of Zoning Appeals (constituted under S.C. Code Β§6-29-780) which holds a public hearing with notice. If a variance is needed, the BZA applies the variance standard under S.C. Code Β§6-29-800 (extraordinary and exceptional conditions, hardship not self-created, and consistency with the spirit of the ordinance). Building Track: After zoning approval, the applicant submits construction documents to the Building Official under the state-adopted IRC. Plan review confirms structural, electrical, plumbing, mechanical, and energy provisions of the IRC for one- and two-family dwellings (or IBC for townhouses or larger configurations). Inspections occur at footing, foundation, framing, rough-in, insulation, and final stages. A Certificate of Occupancy is issued before the ADU may be occupied. Utility connections for water and sewer are administered through the City of Rock Hill Utilities Department; electric service in much of Rock Hill is provided by City of Rock Hill Electric (a municipal utility) or Duke Energy depending on service territory.
Constructing an ADU without permits violates the state-adopted IRC (S.C. Code Β§6-9-10+) and Rock Hill Code Chapter 31. Enforcement is through notice of violation, cease-and-desist orders, civil action in York County Court of Common Pleas under S.C. Code Β§6-29-950, and stop-work orders from the Building Official. After-the-fact permits typically carry doubled fees and require the applicant to demonstrate code compliance through invasive inspections. Unpermitted occupancy without a Certificate of Occupancy is also a violation enforceable by Code Enforcement.
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