Idaho adopts a statewide commercial building code, but local governments must enact it by ordinance for enforcement. Local jurisdictions may amend the code within limits but cannot lower accessibility standards or opt out entirely.
Boise adopts the 2018 International Codes with targeted local technical amendments and has incorporated 2021 IBC mass-timber provisions. Amendments impact snow loads, frost depth, signage, care facilities, and plumbing requirements for commercial projects.
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