Portland, ME Swimming Pools & Spas: Hot Tub Rules (2026)

Under the 2015 IRC adopted by MUBEC (25 M.R.S. §2451), a hot tub or spa is treated like a swimming pool for safety purposes but is exempt from barrier requirements if it is equipped with a listed safety cover that complies with ASTM F1346 (Standard Performance Specification for Safety Covers and Labeling Requirements for All Covers for Swimming Pools, Spas and Hot Tubs). Portland's Permitting & Inspections Department follows this standard: a building permit is generally not required for a stand-alone hot tub, but a plumbing permit is required for any direct fill/drain plumbing connection, and an electrical permit is required for the heater, pump, blower, and any low-voltage lighting (electrical work governed by the National Electrical Code adopted under 32 M.R.S. ch. 17). If the hot tub is installed on a deck more than 30 inches above grade, structural review of the deck is required (a fully filled spa with bathers typically loads 100+ psf). The hot tub itself must have a sand or cartridge filtration system. State 22 M.R.S. §1632 enclosure rules apply unless the safety cover is in place when the tub is not in use.