A residential hot tub or spa fitted with a rigid safety cover that meets ASTM F1346 is exempt from the pool-barrier requirement under the Michigan Residential Code. Without a compliant cover, a 48-inch barrier is required.
Under Michigan Residential Code Appendix G, spas and hot tubs are pools when they hold more than 24 inches of water — but AG105.5 exempts a spa or hot tub from the barrier rules if it has a safety cover complying with ASTM F1346. In practice, a listed locking hard cover satisfies the code without a full fence. Genesee County sets no separate hot-tub ordinance; the standard is the statewide code enforced by your city or township building department. Electrical bonding and GFCI protection under the code also apply. If your spa lacks an approved cover, treat it like a pool and provide the 48-inch barrier.
A spa without an ASTM F1346 cover and without a barrier fails inspection. Electrical bonding/GFCI deficiencies are separate correctable violations.
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