Caldwell, ID Swimming Pools & Spas: Hot Tub Rules (2026)

Caldwell does not adopt a separate spa or hot-tub ordinance. Its building code - the 2018 International Residential Code including Appendix G, adopted in City Code 12-01-01 - is titled for 'swimming pools, spas and hot tubs,' so spas and hot tubs are covered by the same adopted standards as pools. Appendix G of the 2018 IRC generally allows an approved safety cover (a listed, securely fastened cover) to serve in place of a perimeter barrier for a spa or hot tub, which is the common path for residential hot tubs; otherwise the 48-inch barrier and self-closing/self-latching gate requirements apply. On the zoning side, City Code 10-12-03-1(3)C requires pools (and, by the building code's pairing, spas) to be set back ten feet (10') from all property lines and states that barriers are 'provided and regulated under the adopted building codes.' City Code 02-17-02 also lists 'hot tubs' among the improvements regulated as structures for design-review and historic-district purposes. Electrical and gas connections for a spa typically trigger a building permit and inspection. Because the safety-cover allowance and barrier details are building-code matters, homeowners should confirm with the Caldwell Building Safety Division whether a listed safety cover or a barrier is required for their specific spa or hot tub.