Marietta, GA Building Setbacks & Zoning: Lot Coverage Limits (2026)

01(H), the Bulk and Area Regulations table for the R-1 Single-Family Residential/Agriculture district, caps Maximum Lot Coverage at 35 percent, alongside a 25,000-square-foot minimum lot size, a density ceiling of 1 dwelling unit per acre, and a 1,800-square-foot minimum floor area for the house itself. 01(F)(2) folds an attached accessory building into the principal structure's own bulk and area requirements. 02(H) carries the identical Maximum Lot Coverage of 35 percent for the R-2 district, which allows smaller, 15,000-square-foot lots at a higher density of 2 units per acre.

Moving up to R-3 and R-4, the table splits the single lot-coverage figure into two separate numbers: a Maximum Building Coverage of 35 percent for the structures themselves, plus a separate Maximum Impervious Surface ceiling of 50 percent that also counts driveways, patios and other paved area. Practically, an R-1 or R-2 homeowner has to keep the footprint of the house, garage, ADU and any other accessory structure combined under 35 percent of the total lot area before a building permit can be issued, since the Bulk and Area Regulations table governs alongside the setback figures in the same section.