A hot tub or spa deeper than 24 inches needs a building permit in Lynn, plus electrical permitting. The MA Building Code (780 CMR) requires a 48-inch barrier unless the spa has an approved locking safety cover.
Permanent hot tubs and spas in Lynn follow the same permit threshold as pools: a building permit is required for any that hold water deeper than 24 inches, and a separate electrical permit covers the 240-volt wiring, GFCI protection, and bonding. Under the MA Building Code (780 CMR), a spa needs a 48-inch barrier unless it is fitted with a lockable safety cover meeting ASTM F1346, which most manufacturers supply. Under the 2025 Lynn Zoning Ordinance (Section 4.5.c.iii), a spa is treated as a pool: not in the front yard and set back at least six feet from rear and side lot lines. Apply through Inspectional Services at lynnisdportal.com.
Installing a spa without building and electrical permits triggers a stop-work order and penalty fees. A spa lacking either a compliant barrier or an approved locking cover fails inspection and cannot be used.
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