5 county-level rules, plus city-specific rules for 1 city in Williamson County, Tennessee.
Verified from official government sources
In unincorporated Williamson County, any pool designed to hold water more than 30 inches deep needs a building permit and must meet zoning setbacks. Pools 30 inches or shallower with no permanent filter or decking are exempt.
Williamson County, TN, Zoning Ordinance Sec. 23.04 (Not-Exempt Definition)
Swimming Pools – Whether above or below grade level, designed to hold water more than 30 inches deep to be used for recreational purposes and installed within the unincorporated area of Williamson County, require a building permit and must meet zoning requirements.
Every swimming pool in unincorporated Williamson County must be fenced at least four feet high under Zoning Ordinance Section 11.04. Gates must open outward, self-close, and self-latch, and no opening may pass a four-inch sphere.
Williamson County, TN, Zoning Ordinance Sec. 11.04(a)
The fence shall be a minimum of four (4) feet high and shall encompass the pool area to prevent unauthorized entry.
Beyond the four-foot fence, Williamson County pools must satisfy Tennessee's Katie Beth's Law, which requires a pool alarm on any pool installed after January 1, 2011. Self-latching gates and a filled-pool final inspection complete the safety package.
Tenn. Code Ann. § 68-14-804 (Katie Beth's Law)
Each person, enterprise, agency or entity that purchases or acquires a swimming pool to be installed after January 1, 2011, shall install and maintain a pool alarm before using or making available for use such swimming pool.
An above-ground pool holding more than 30 inches of water needs a permit in unincorporated Williamson County. The pool wall can replace a fence only if it stands four feet above grade all around and the ladder is secured, locked, or removable.
Williamson County, TN, Zoning Ordinance Sec. 11.04(g)
The sides of an above-ground swimming pool may constitute compliance with the fencing standard if (a) the entire area around the outside of the pool measures four (4) feet from ground (finished grade) level to the top of the pool, and (b) The ladder or steps can be secured, locked, or removed to prevent unauthorized access to the pool.
A hot tub or spa holding more than 30 inches of water is regulated like a pool in unincorporated Williamson County: it needs a building permit, zoning compliance, and an electrical permit for its 240-volt circuit.
1 cities in Williamson County have their own swimming pools & spas rules. Each link goes to that city's dedicated page with code citations.
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