Retaining walls are treated as structures under Charleston County's zoning and building rules. Walls counted as fences or walls are measured from the higher side, must not obstruct drainage or roadway sight lines, and taller or masonry walls typically need a permit. Larger engineered walls trigger building-code and stormwater review.
The ZLDR measures wall height from ground level on the higher side (§4.2.4.A) and prohibits walls from obstructing natural drainage courses, drainage easements, or the roadway vision triangle between three and ten feet above grade (§4.2.3, §4.2.4). Masonry walls (brick, stone, concrete) require a zoning permit at any height under §3.8.2.C. Structural retaining walls above building-code thresholds also need a building permit and may require engineering and county stormwater/land-disturbance review, especially near marsh, critical-line, or floodplain areas common on the sea islands.
A masonry or structural retaining wall built without required zoning/building permits, or one that blocks drainage, is a violation subject to correction orders and possible removal.
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