Hot tubs and spas in Bellingham are governed by the 2021 International Swimming Pool and Spa Code (ISPSC) adopted under BMC Chapter 17.10 and Washington State Building Code (Chapter 51-50 WAC), effective March 15, 2024. ISPSC Section 305.6 exempts spas and hot tubs with a safety cover complying with ASTM F1346 from the barrier provisions. A building permit is required for hot tubs/spas that exceed the BMC 17.10.020 exemption (prefabricated above-ground, less than 24 inches deep, no more than 5,000 gallons, accessory to a 1- or 2-family dwelling). Electrical permits and NEC Article 680 bonding inspections are administered by Washington State L&I under WAC 296-46B.
ISPSC 2021 Section 305.6 (Spa and Hot Tub Exception), as adopted under BMC Chapter 17.10 and Chapter 51-50 WAC, provides that 'A spa or hot tub with a safety cover that complies with ASTM F1346 shall be exempt from the provisions of this section [barrier requirements].' This is the key distinction from in-ground pools: a hot tub with a listed ASTM F1346 cover does not require a 48-inch perimeter barrier. The BMC 17.10.020 (Construction Administrative Code) permit exemption applies to 'prefabricated swimming pools accessory to a 1- and 2-family dwelling or Group R-3 occupancy which are less than 24 inches (610 mm) deep, do not exceed 5,000 gallons (18,925 L) and are installed entirely above ground.' Most permanent hot tubs and spas exceed 24 inches of operating depth (typical operating depth is 30-42 inches), so the building permit obligation generally applies. Residential electrical permits for hot tub circuits and NEC Article 680 bonding are administered by Washington State L&I under WAC 296-46B. Decks supporting hot tubs must meet the load provisions of the 2021 IRC (WAC 51-51); a filled hot tub plus occupants commonly exceeds standard deck residential live load, so engineered design or strengthening is typically required. The Bellingham Permit Center at (360) 778-8300 reviews building permit applications and verifies barrier (or ASTM F1346 cover) compliance.
Installing a hot tub or spa that exceeds the BMC 17.10.020 exemption without a Bellingham building permit violates BMC Chapter 17.10 and the Washington State Building Code (WAC 51-50). A hot tub without either an ASTM F1346 safety cover or a code-compliant 48-inch barrier violates ISPSC 305 / 305.6. Performing pool/spa electrical work without a Washington State L&I electrical permit violates WAC 296-46B. A hot tub installed on a deck without verified load capacity violates the 2021 IRC (WAC 51-51).
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