Mount Pleasant, SC Fence Regulations: Retaining Walls (2026)

Retaining walls appear in Mount Pleasant's zoning code as an accessory structure rather than in a stand-alone engineering ordinance. 436-1), lists "Retaining wall (greater than 4 feet in height)" with no separate accessory-use conditions, but with the Zoning Permit Required column marked "Yes" and the Allowed Districts/Locations column marked "All districts," meaning the four-foot threshold applies townwide regardless of the underlying residential or commercial zoning classification. Walls at or below four feet are not separately listed and so fall under the table's general allowance for minor accessory structures, which does not require a zoning permit unless another provision applies.

3, a resident proposing a retaining wall over four feet must obtain a zoning permit through the Planning, Land Use and Neighborhoods Department before construction, with the site plan reviewed alongside any applicable stormwater, drainage, or easement requirements elsewhere in Chapter 156 and the Land Development Regulations at Chapter 155. The table row itself does not print an engineering-stamp standard; any structural requirement for a wall of a given height comes from the building code adopted elsewhere in the Town's code, not from this zoning table entry.