Nashville limits lot coverage (the percentage of a lot covered by structures and impervious surfaces) through zoning district regulations in Title 17. Typical single-family zones allow up to 40% impervious surface ratio (ISR). The contextual overlay may further restrict lot coverage to match neighborhood patterns.
Lot coverage in Nashville is regulated through the Impervious Surface Ratio (ISR) in the zoning code. Standard residential zones typically allow 40% ISR, meaning no more than 40% of the lot can be covered by buildings, driveways, patios, and other impervious surfaces. Multi-family and commercial zones have higher ISR allowances. The contextual overlay district may impose additional restrictions. Nashville's stormwater management requirements also effectively limit lot coverage by requiring on-site stormwater detention for high-impervious developments. The Board of Zoning Appeals can grant ISR variances with demonstrated hardship.
Exceeding lot coverage limits is a zoning violation. Building permits will not be issued for plans exceeding the ISR. Existing violations discovered during property transfers or renovations may require remediation.
Nashville, TN
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