Mount Pleasant, SC Accessory Structures: Tiny Homes (2026)
Tiny home rules in Mount Pleasant, 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
- Tiny house size limit
- 400 sq ft or less, excl. lofts
- Loft definition
- >30 in. above floor, under 6'8" ceiling
- Tiny house on wheels
- Classified as a recreational vehicle
- Flood-zone RV rule
- Under 180 days, or highway-ready, or flood-built
- Governing sections
- § 156.1681 and § 152.24(C)
- Default penalty
- Up to $500 or 30 days, § 10.99
Summary
Mount Pleasant's zoning code, at § 156.1681, defines a "tiny house" as a detached house dwelling of 400 square feet or less in gross floor area, excluding lofts. A separate legal category, "tiny house on wheels," is not treated as a house at all: the code folds it into the definition of "recreational vehicle," built for temporary travel or vacation use, not permanent living.
RECREATIONAL VEHICLE. ... A vehicle which is built on a single chassis; designed to be self-propelled or permanently towable by a car, sport-utility vehicle, or light duty truck; and designed to be used as a temporary dwelling for travel, recreational, or vacation purposes. This definition includes pickup campers, converted buses, tiny houses on wheels, and pop-up campers. ... TINY HOUSE. A detached house dwelling that is 400 square feet or less in gross floor area, excluding lofts. A "loft" is a floor level located more than 30 inches above the main floor, open to the main floor on one or more sides with a ceiling height of less than six feet, eight inches and used as a living or sleeping space. TINY HOUSE ON WHEELS. See RECREATIONAL VEHICLE.
Full Breakdown
Mount Pleasant's zoning code treats a stick-built tiny house and a tiny house on wheels as two different legal things. 1681 defines "tiny house" as a detached house dwelling of 400 square feet or less in gross floor area, excluding lofts; a loft is defined as a floor level more than 30 inches above the main floor, open to the main floor on one or more sides, with a ceiling height under six feet eight inches, used as living or sleeping space. That structure is a house, subject to the same dimensional standards and residential district rules as any other detached dwelling.
"Tiny house on wheels" gets no definition of its own: the code sends the reader to "recreational vehicle," a vehicle built on a single chassis, designed to be self-propelled or towable, and built for temporary dwelling during travel, recreation or vacation, not permanent living. That reclassification has teeth in the town's flood damage prevention chapter. 24(C) requires any recreational vehicle placed on a site to meet one of three conditions: stay on the site fewer than 180 consecutive days; remain fully licensed and ready for highway use, meaning it sits on its wheels or jacking system, connects only through quick-disconnect utilities and security devices, and carries no permanently attached structures; or meet the same elevation and anchoring standards required for new construction.
In practice, a tiny house on wheels parked long-term on a Mount Pleasant lot in a flood hazard area has to either keep moving, stay road-ready, or be built up to full flood-construction standards, the same as a manufactured home.
Violations & Fines
Keeping a tiny house on wheels sited past the limits in § 152.24(C), without either staying road-ready or meeting new-construction elevation and anchoring standards, is a zoning and flood-ordinance violation the Building Official and Planning, Land Use and Neighborhoods Department can act on. Absent a violation-specific fine in that chapter, the town's general penalty at § 10.99 applies: up to a $500 fine or 30 days' imprisonment, with each day of a continuing violation a separate offense.
Frequently Asked Questions
Does Mount Pleasant's code let you live in a tiny house on wheels permanently?
What counts as a "tiny house" versus a "tiny house on wheels" here?
Can a tiny house on wheels stay on a lot indefinitely in a flood zone?
Sources & Official References
Other rules in Mount Pleasant
Compare Mount Pleasant to another location·View the South Carolina accessory structures overview
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