Dorchester County, SC Accessory Structures: Tiny Homes (2026)
Tiny home rules in Dorchester County, SC, covering tiny houses on wheels (THOWs), park model RVs, and tiny home on foundation builds, determine where they are legal and how they get permitted.
Key Facts
- Legal Tiny House
- 2021 SC Code Appendix AQ
- Size Cutoff
- 400 sq ft or less
- On Wheels
- Treated as an RV
- Septic
- SCDES 61-56 off sewer
Summary
A tiny house is a legal dwelling in Dorchester County only if built to the 2021 SC Residential Code, which adopts Appendix AQ for homes 400 square feet or less. A tiny house on wheels is treated as an RV, not a permanent home.
This appendix shall be applicable to tiny houses used as single dwelling units. ... TINY HOUSE. A dwelling that is 400 square feet (37 m2) or less in floor area excluding lofts.
Full Breakdown
South Carolina's 2021 Residential Code includes Appendix AQ, which applies to tiny houses used as single dwelling units and defines a tiny house as 400 square feet or less excluding lofts, easing some stair, loft, and escape rules. Dorchester County permits a tiny house built to this code on a foundation, with zoning review and, off public sewer, a SCDES Regulation 61-56 septic permit. A tiny house on wheels is a recreational vehicle and cannot be permitted as a permanent dwelling; the county issues no certificate of occupancy for it, and flood-zone lots add elevation requirements.
Violations & Fines
Placing a tiny house without a building permit is illegal construction. Living permanently in a tiny house on wheels or an RV is prohibited; the county grants no occupancy for it.
Frequently Asked Questions
Can I build a tiny house in Dorchester County?
Can I live in a tiny house on wheels?
Sources & Official References
Other rules in Dorchester County
Compare Dorchester County to another location·View the South Carolina accessory structures overview
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