Hot tubs and spas are treated exactly like pools under Ada County's Section AG 105 and must be surrounded by a compliant barrier. The barrier requirement applies to spas and hot tubs the same as in-ground pools.
Section AG 105.2 lists 'hot tub or spa' alongside pools as requiring an enclosing barrier at least 48 inches tall meeting all opening-size limits. Idaho's IRC does not automatically exempt hot tubs based on a locking cover in Ada County's adopted appendix, so plan on a barrier. Public spas are additionally regulated as public pools under IDAPA 16.02.14. Verify parcel jurisdiction; cities set their own spa rules.
An unenclosed hot tub or spa is a barrier-code violation; the county can require a compliant barrier and cite the owner.
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