Guilford County, NC Building Setbacks & Zoning: Lot Coverage Limits (2026)

3 sets the RS-30 district's Maximum Building Coverage at 30% of the lot, meaning the combined ground-floor footprint of the principal dwelling, attached garage, porches and any detached accessory buildings on the parcel cannot cover more than three-tenths of the total lot area. RS-30 is the county's 30,000-square-foot minimum lot size district for unincorporated areas without public water or sewer, and the 30% cap sits alongside the district's other dimensional standards: a 100-foot minimum lot width, 50-foot street frontage, front setbacks of 40 to 50 feet depending on road classification, a 10-foot interior side yard, a 30-foot rear yard, and a 50-foot maximum structure height limited to three stories.

The coverage percentage is calculated the same way for cluster (conservation) subdivisions built on qualifying tracts, which otherwise follow the RS-20 district's dimensional table under Subsec. 8. Accessory structures count toward the 30% cap even though they carry their own reduced setbacks: a detached accessory building of 600 square feet or less gets a 5-foot side and rear setback instead of the standard 10-foot and 30-foot minimums, but its footprint still adds to the lot's total coverage. Guilford County Planning & Development staff review building coverage during zoning compliance review before a building permit is issued, and coverage that would push a lot over 30% is grounds to deny or condition the permit under UDO Subsec. 05 until the plans are revised or a variance is obtained from the Board of Adjustment.