Charleston, SC Building Setbacks & Zoning: Lot Coverage Limits (2026)

1: Height, Area and Setback Regulations, adopted under City of Charleston Zoning Ordinance Sec. 54-301, sets the 'Maximum Percent of Lot Occupied by Buildings' for every standard zoning district in the city, except the Neighborhood District and the Agricultural (AG-8, AG-S) districts, which are governed by their own Part 13 and Article 10 standards instead. The Conservation (C) district carries the lowest citywide cap at 25 percent, reflecting its purpose of protecting marshlands, forested areas and scenic land not likely to be developed. Most single-family zones, SR-1, SR-3, SR-4, SR-5 and SR-7, are capped at 35 percent, while the denser SR-2, SR-6 and Single- and Two-family Residential (STR) districts allow up to 50 percent.

Diverse Residential (DR) districts follow the same 50 percent ceiling in DR-9, DR-12, DR-1F and DR-2F, while DR-6, DR-1 and DR-2 hold to 35 percent. Commercial-residential overlays such as LB, GB and LI residential uses are also capped at 50 percent. 1 points to the definitions of 'Building' and 'Lot Occupancy' in Sec. 54-120 for how the percentage is calculated against total lot area. Accessory buildings must also stay within the same lot occupancy ceiling as the principal structure, per the setback-exception provisions of Sec.

' Site plans reviewed by the Zoning Administrator's office in the Department of Planning and Preservation confirm compliance before a building permit or certificate of occupancy issues. Within Neighborhood Districts, footnote 22 removes the maximum lot occupancy requirement entirely, substituting street-type based standards under Sec. 54-294.