Shed permit rules in Williamson County, TN — also referred to as storage shed, backyard shed, or accessory building regulations — set size limits, setbacks, and when a building permit is required.
Small backyard sheds in unincorporated Williamson County are permit-exempt, but the Building Codes Department requires a permit for larger accessory buildings and for any structure on a permanent foundation. Sheds must meet zoning setbacks and the 20-percent lot-coverage cap.
A shed in unincorporated Williamson County is an accessory structure under Zoning Ordinance Section 23.04, so it must stay incidental to the home and, with other accessory uses, cover no more than 20 percent of the lot. The Building Codes Department (615-790-5718) exempts small one-story sheds from a building permit but requires one for larger outbuildings and for any structure on a permanent foundation such as a concrete slab. A permitted shed still must meet the setbacks of its zoning district, and the ordinance's sliding scale ties allowable accessory-structure size to parcel size. A shed cannot be used as living quarters.
A shed placed inside a required setback or exceeding the accessory-use coverage limit violates the Zoning Ordinance and can be ordered moved or removed. An oversized or slab-founded shed built without a permit is unlawful.
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