What requires a permit, what is exempt, and how South Carolina's building code applies to outdoor living projects in Fort Mill, Tega Cay, Rock Hill, Clover, and Lake Wylie — including who actually controls the Lake Wylie shoreline. Reviewed August 2026.
South Carolina enforces the International Residential Code as adopted by the state Building Codes Council. In York County that means: decks more than 30 inches above grade require a building permit, as do roofed structures, attached work, and pools over 24 inches deep — with the IRC's 48-inch barrier and self-latching gate rules attached. One-story detached accessory structures under 200 square feet are generally exempt. York County Building & Codes serves unincorporated areas; Fort Mill, Tega Cay, and Rock Hill run their own permit offices — the address decides where your application goes.
At-grade paver and concrete patios are generally exempt from building permits — zoning setbacks and drainage still apply, and in the Charlotte metro's expansive clay soils, base preparation and water management are what keep hardscape flat. Retaining walls above roughly four feet typically require engineering and a permit; on Lake Wylie's sloped lots, the wall is usually the permitted element, not the patio.
Lake Wylie's shoreline is managed by Duke Energy under its federal hydroelectric license — the same two-rulebook structure as Smith Mountain Lake in Virginia. Docks, boat lifts, boathouses, and seawalls require a Duke Energy Lake Services permit; York County does not permit docks at all, only the electrical connection serving them. The patio, pergola, or pool above the shoreline is county or municipal territory. Allscape designs lakefront projects to clear both systems in one coordinated plan.
The short version of the rules for the three most common outdoor living projects. Confirm specifics with your municipality or York County Building & Codes — requirements are finalized at plan review.
No building permit for at-grade flatwork in most cases. Zoning setbacks and drainage apply. Retaining walls above roughly four feet need engineering and a permit.
Deck more than 30 inches above grade: permit required. Detached one-story structure under 200 sq ft: generally exempt. Roofed, attached, or motorized structures: permitted, engineered work.
Pool over 24 inches deep: county permit plus 48-inch barrier. Dock, lift, or seawall on Lake Wylie: Duke Energy Lake Services permit — the county only permits the electrical connection.
York County including Fort Mill, Tega Cay, Rock Hill, Clover, York, and the Lake Wylie waterfront communities — the South Carolina side of the Charlotte metro. Duke Energy's shoreline rules apply lake-wide, including the Mecklenburg and Gaston County, NC sides.
