Building code in Idaho

Idaho has adopted 2018 IBC (and 2018 IRC, locally titled Idaho Residential Code 2020 Edition) (IBC / IRC (ICC)), effective January 1, 2021. The adopting authority is Idaho Division of Occupational and Professional Licenses (DOPL) - Building Program. Verified June 28, 2026.

Idaho adopts the 2018 International Building Code with amendments and the 2018 International Residential Code (parts I, II, III and IX) with Idaho amendments (collectively titled the Idaho Residential Code, 2020 Edition); also the 2018 IECC (Idaho Energy Conservation Code 2020 Edition) and 2018 IEBC. The '2020 Edition' label refers to the legislative session in which amendments were adopted, not the I-Code year. Proposals to adopt the 2024 IBC/IRC are pending but not yet in force.

It is the specific edition of a model code (for example the 2023 NEC, the 2021 IBC, or CSA C22.1:24) that a state or province has legally adopted and currently enforces. Codes are republished on roughly three-year cycles, and each jurisdiction adopts a new edition on its own schedule — often with amendments — so the edition in force varies by place and by discipline.

Not always. Many jurisdictions set a statewide or provincial baseline edition, but local building departments (the authority having jurisdiction, or AHJ) can amend it or enforce a different edition. Some states leave most adoption to local jurisdictions, and a few large cities such as Chicago and New York City run their own codes. Always confirm with your AHJ.

In the United States: the NEC (NFPA 70) for electrical, the ICC I-Codes (IBC/IRC) for building, the UPC (IAPMO) or IPC (ICC) for plumbing, the IMC/UMC for mechanical, the IFGC/NFPA 54 for fuel gas, and the IFC/NFPA 1 for fire. In Canada: the Canadian Electrical Code (CSA C22.1), the National Building, Plumbing and Fire Codes of Canada and their provincial editions, and CSA B149.1 for gas.

NFPA offers free read-only online access to many of its standards including the NEC, and the ICC publishes its I-Codes through a free online reading room. Canadian codes are typically published by CSA Group or the National Research Council and may require purchase or membership. Each result links to the official source.

Trade codes are copyrighted by their standards bodies (NFPA, ICC, IAPMO, CSA). This directory publishes only factual adoption data — which edition is in force, when it took effect, who the authority is, whether it is amended, and where to read it officially — and links you to the official source for the code text itself.