Mount Pleasant, SC Building Setbacks & Zoning: Setback Rules (2026)

1650 set the horizontal distance a principal structure must keep from the front, rear, and side lot lines, with the exact minimums tied to the zoning district under Subchapter B. 039-1 sets those minimums for the R-1, R-2, R-3, and R-4 Residential Districts: R-1 detached houses need a 30-foot front setback, 30-foot rear setback, and 10-foot individual side setback (25 feet combined); R-2 requires 25 feet front and rear with the same 10/25-foot side setbacks; R-3 detached houses and duplexes both require 20-foot front and rear setbacks with 10-foot individual/20-foot combined side setbacks; and R-4 detached houses need only a 4-foot front setback, a 20-foot rear setback, and a 5-foot individual side setback (10 feet combined), with a footnote allowing 5-foot side yards generally except where zero lot lines are shown on the plat.

1647 from the lot line to the closest projection of any building or structure, aside from allowed encroachments. 1648(C) lets an average front setback reduce the minimum on a lot where the average setback of existing buildings within 100 feet on both sides, on the same block, same zoning district, and same side of the street, is already less than the required minimum, but the new setback can never go below that neighborhood average. Lots inside the Old Village Historic District instead have their setback fixed during the certificate-of-appropriateness review under Subchapter H design review, using a build-to line of 20 to 30 feet rather than the district table.