Unincorporated Gwinnett limits impervious/building lot coverage by zoning district. R-100 typically caps total impervious coverage around 35-45%; RA-200 much lower given rural character. Accessory structures count toward the total.
Gwinnett UDO establishes maximum lot coverage limits for each zoning district to manage stormwater runoff and maintain neighborhood character. Coverage is typically measured as the percentage of the lot occupied by all impervious surfaces (buildings, driveways, patios, pool decks) or by buildings only, depending on the zone. R-100 (single-family residential) typical building coverage around 35%; total impervious can be higher. R-TH (townhouse) allows higher coverage given denser form. RA-200 (rural agricultural, 200,000 sf minimum lot) has low coverage limits preserving open space. Exceeding coverage requires a variance from the Board of Appeals. New construction or additions that push lot coverage over the limit may trigger stormwater management requirements including detention, infiltration, or fee-in-lieu contributions. Check the specific zone and the Gwinnett Stormwater Design Manual for project-specific requirements.
Over-coverage construction denied permits; existing excess coverage may need retrofit stormwater mitigation; variances required to legalize.
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