Williamson County, TN Building Setbacks & Zoning: Setback Rules (2026)

07 of the Williamson County Zoning Ordinance sets the county's minimum yard setbacks by zoning district, distinguishing traditional subdivisions from conservation subdivisions. 99 acres or for conservation subdivisions in these six districts. Nonresidential structures in the same districts carry a 100-foot front, 50-foot side, and 50-foot rear setback. In the Municipal Growth Area districts (MGA-1, MGA-5, MGA-H) and the Hamlet (H) district, residential setbacks run 100 feet front (traditional, 5 acres or greater) or 35 feet front (conservation), 25 feet side (traditional) or 10 feet side (conservation), and 50 feet rear (traditional) or 30 feet rear (conservation); the Neighborhood Conservation (NC) and Neighborhood Conservation Manufactured Housing (NCMH) districts carry the identical 100/35/25/10/50/30-foot figures.

07(A) directs that where the summary table conflicts with another provision of the Ordinance, the most restrictive standard applies. 04 permits limited encroachments into these required setbacks: sidewalks, landscaping, clotheslines, HVAC units, and fences or walls other than retaining walls may sit inside the setback outright, while awnings, bay windows, porches, steps, eaves, gutters, sills, and similar features may project up to 3 feet into the setback with Planning Director approval; driveways and retaining walls are separately permitted encroachments. 06 governs undersized, pre-zoning lots: their setbacks follow the recorded subdivision plat, the setbacks in effect when the lot was created, or, for lots platted before zoning existed, the Conservation Subdivision standards of RP-1 for lots under 1 acre or the Traditional Subdivision standards of RP-1 for lots of 1 acre or more.