Yes, tiny homes are legal in South Carolina, but their compliance hinges on zoning, building codes, and local ordinances. The state recognizes them under residential use if they meet International Residential Code (IRC) Appendix Q or adhere to local standards. However, 2026 amendments to the SC Uniform Statewide Building Code (USBC) will tighten modular and accessory dwelling unit (ADU) definitions, potentially excluding some tiny homes from permanent residency unless certified under Appendix Q. Municipalities like Charleston and Greenville impose additional restrictions, often requiring minimum lot sizes or septic system compliance.
Key Regulations for Tiny Homes in South Carolina
- Building Codes: Must comply with IRC Appendix Q (for tiny homes ≤400 sq. ft.) or the 2026 USBC amendments. Off-grid structures without permanent foundations may require variances from the SC Department of Health and Environmental Control (DHEC) for wastewater disposal.
- Zoning Restrictions: Local governments (e.g., Beaufort County, Columbia) classify tiny homes as ADUs, mobile homes, or accessory structures, often banning them in single-family zones. Some municipalities cap occupancy at 30 days/year unless connected to utilities.
- Foundation Requirements: Permanent tiny homes on foundations must meet SC Residential Code (SCRC) Chapter 4, while movable units (e.g., park models) fall under SC Code §46-55-10, requiring annual inspections by the SC Department of Labor, Licensing and Regulation (LLR).
Critical Compliance Notes:
- Permits: Required in all jurisdictions; plan reviews by local building officials (e.g., City of Rock Hill) may reject designs exceeding 400 sq. ft. without special approval.
- Utility Hookups: Connection to municipal water/sewer is mandatory in most urban areas; rural counties (e.g., Oconee) permit composting toilets if DHEC-approved.
- Taxation: Assessed as real property if permanently affixed; movable units are taxed as personal property, with rates varying by county (e.g., Charleston County’s 1.2% millage rate).
Enforcement Trends: The SC Association of Code Enforcement (SCACE) has increased spot inspections post-2023, targeting unpermitted tiny home communities in Horry and Lexington Counties. Consult local planning departments (e.g., Greenville County’s Tiny Home Task Force) for jurisdiction-specific variances.