In Dorchester County, retaining walls are regulated through the county's adopted South Carolina building code. A wall over four feet, measured from the bottom of the footing to the top, generally requires a building permit and engineered plans; shorter walls are usually exempt.
Dorchester County reviews retaining walls under the South Carolina building code it enforces through Building Services, which follows the International Residential and Building Codes. The common threshold is four feet, measured from the bottom of the footing to the top of the wall; walls over that height, and shorter walls carrying a surcharge such as a driveway or slope above them, require a building permit and plans stamped by a licensed engineer. Drainage behind the wall is critical in flat, water-holding Lowcountry soils, and a wall that redirects stormwater onto a neighbor creates civil liability. The ZLDS also treats walls like fences for setback and finished-side purposes.
An unpermitted retaining wall over the height threshold can draw a county stop-work order and a required engineering review, with fines. A wall that channels stormwater onto adjoining property invites a separate civil damage claim regardless of permitting.
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