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.
Williamson County treats a spa or hot tub that holds water more than 30 inches deep as a swimming pool under Zoning Ordinance Section 23.04, so it needs a building permit, must meet the rear-yard setbacks, and falls under the Section 11.04 barrier rules. The 240-volt circuit requires an electrical permit with GFCI protection under the adopted code. Tennessee's Katie Beth's Law pool-alarm requirement applies to pools installed after January 1, 2011. A portable spa holding 30 inches of water or less, with no permanent connection, generally does not require a permit. Confirm placement with the Building Codes Department at 615-790-5718.
Unpermitted 240-volt spa wiring fails inspection and must be corrected. A regulated spa without the required barrier or pool alarm cannot pass its final inspection.
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