Accessory Structures in Rock Hill, SC (2026)
5 verified accessory structures rules for Rock Hill, South Carolina, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
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 §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 §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.
Rock Hill SC ADU Rules (Code of Ordinances Ch. 31 Zoning; S.C. Code §6-29-310+; No State ADU Preemption)
Some RestrictionsADU Permits
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 §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 §6-29-310 et seq. and applicable local ordinances.
Rock Hill SC ADU Permits (Planning & Development; Zoning + Building Both Required)
Some RestrictionsADU Impact Fees
South Carolina has enacted a comprehensive impact fee enabling statute — the South Carolina Development Impact Fee Act at S.C. Code §6-1-910 et seq. — which authorizes municipalities to impose development impact fees only if the locality has adopted a capital improvements plan and meets the statute's strict procedural and substantive requirements. Whether Rock Hill imposes development impact fees on ADUs depends on whether the city has adopted an impact fee ordinance under §6-1-910+ and how it classifies ADUs in any adopted fee schedule. ADU applicants in Rock Hill typically also face standard zoning permit fees, building permit fees under the state-adopted IRC, and water/sewer tap fees through Rock Hill Utilities.
Rock Hill SC ADU Impact Fees (S.C. Development Impact Fee Act §6-1-910+; Permit & Utility Tap Fees Apply)
Some RestrictionsShed Rules
Sheds and similar accessory structures in Rock Hill are regulated through two layers: (1) Chapter 31 (Zoning) of the Rock Hill Code of Ordinances, which sets dimensional standards by district (size, height, setbacks, lot coverage, location relative to the principal dwelling); and (2) the state-adopted International Residential Code under S.C. Code §6-9-10 et seq., which at IRC R105.2 typically exempts one-story detached accessory structures of 200 square feet or less from building permit requirements but does not waive zoning compliance. Rock Hill property owners generally still need a zoning permit from the Planning and Development Department even when no building permit is required.
Rock Hill SC Shed Rules (Code Ch. 31 Accessory Structure Standards; IRC R105.2 Permit Threshold)
Some RestrictionsGarage Conversions
Converting a Rock Hill garage into habitable space (a bedroom, in-law suite, home office, or ADU) requires both (1) zoning approval under Rock Hill Code Chapter 31 for the change of use, since the converted area no longer functions as accessory parking and may trigger off-street parking minimums or ADU classification; and (2) a building permit under the state-adopted International Residential Code per S.C. Code §6-9-10 et seq. Conversions must meet IRC Chapter 3 requirements for habitable spaces including R310 emergency egress, R305 ceiling height, R314 smoke alarms, and R315 carbon monoxide alarms, and Chapter 31's off-street parking minimums must still be satisfied after the garage is removed.
Rock Hill SC Garage Conversions (Ch. 31 Change-of-Use Review; IRC R310/R305 Egress and Ceiling Height)
Some RestrictionsLooking for York County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Rock Hill city rules.
Accessory Structures in York County →