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PermitRoadmap

Do I need a permit for accessory dwelling unit (adu) in York County (Unincorporated)?

Permit required

Yes. In South Carolina, accessory dwelling unit (adu) generally requires a permit, and York County (Unincorporated) is no exception.

S.C. Code Section 6-10-50 says construction of a building must not begin until a building permit is issued, and a building constructed under the Energy Standard must not be occupied until a certificate of occupancy is issued. South Carolina has no statewide law requiring cities or counties to allow accessory dwellings, so local zoning decides whether an ADU is allowed. The 2025-2026 bill H. 3469 would only have added a property tax exemption, and it remained in House committee. The owner-builder exemption in S.C. Code Section 40-59-260 covers work for the owner's own or family occupancy only, not structures intended for sale or rent. An ADU built to rent out needs a licensed residential builder.

Get the checklist for your accessory dwelling unit (adu) in York County (Unincorporated). A free check first, then a free printable Permit Prep Pack.

Documents you may need

  • Building permit applicationRequired
  • Site plan showing the unit, setbacks, lot coverage, parking and utility routesRequired
  • Construction drawings with floor plan, foundation, framing and energy compliance detailsRequired
  • Zoning approval confirming an accessory dwelling is allowed on the lotLikely required
  • Separate electrical, plumbing and mechanical permit informationLikely required

Possible inspections

  • Footing and foundation inspection
  • Framing and rough electrical, plumbing and mechanical inspections
  • Insulation inspection
  • Final inspection and certificate of occupancy

Frequently asked questions

Do I need a permit for accessory dwelling unit (adu) in York County (Unincorporated)?
Yes. In South Carolina, accessory dwelling unit (adu) generally requires a permit, and York County (Unincorporated) is no exception. The documents and inspections sections on this page list what the building department typically asks for.
Who issues the permit in York County (Unincorporated)?
The local building department for York County (Unincorporated) handles permitting. This page lists its contact details and online portal. Your mailing city is not always the permitting authority, so confirm the jurisdiction before you apply.
How do I find out the exact requirements for my project?
Run the free PermitRoadmap check for your specific project and answers. It returns the likely permits, documents, inspections, and next steps, each linked to its official source.

PermitRoadmap is an independent informational service and is not affiliated with any city, county, state agency, or permitting authority. Results are informational and do not replace confirming requirements with the local permitting authority.