Idaho building code
Idaho has adopted 2018 IBC. The table below lists the governing edition for every discipline a plan check touches, followed by the Idaho cities and counties that amend it locally.
- Current edition
- 2018 I-Codes (IBC, Idaho Residential Code based on 2018 IRC, Idaho Energy Conservation Code based on 2018 IECC, IMC, IFGC, IEBC, IFC) + 2023 NEC + 2017 Idaho State Plumbing Code (2015 UPC base)
- Code authority
- Idaho Division of Occupational and Professional Licenses (DOPL), Building, Construction & Real Estate Bureau: Building Program; Idaho Building Code Board (fire code administered by the Idaho State Fire Marshal)
Adopted code by discipline
| Discipline | Adopted code | Local amendment |
|---|---|---|
| Building | 2018 IBC | n/a |
| Residential | 2020 Idaho Residential Code based on 2018 IRC (Parts I, II, III and IX) | n/a |
| Existing buildings | 2018 IEBC | n/a |
| Fire | 2018 IFC | n/a |
| Electrical | 2023 NEC | n/a |
| Mechanical | 2018 IMC | n/a |
| Plumbing | 2017 Idaho State Plumbing Code based on 2015 UPC | n/a |
| Energy | 2020 Idaho Energy Conservation Code based on 2018 IECC | n/a |
| Accessibility | 2009 ICC/ANSI A117.1 based on ICC A117.1-2009 | n/a |
| Fuel Gas | 2018 IFGC | n/a |
Sources
- https://dopl.idaho.gov/wp-content/uploads/2025/06/2025-Updated-Idaho-Adopted-Codes.pdf
- https://adminrules.idaho.gov/rules/current/24/243930.pdf
- https://dopl.idaho.gov/bld/bld-statutes-and-rules/
- https://legislature.idaho.gov/statutesrules/idstat/title39/t39ch41/sect39-4116/
- http://www.iapmo.org/Pages/IdahoPlumbingCode.aspx
- https://www.iccsafe.org/advocacy/adoptions-map/idaho/
- https://boisedev.com/2026/02/23/building-code-rejected/
Common questions
What building code does Idaho use?
Idaho uses 2018 IBC. It is administered by the Idaho Division of Occupational and Professional Licenses (DOPL), Building, Construction & Real Estate Bureau: Building Program; Idaho Building Code Board (fire code administered by the Idaho State Fire Marshal).
Do cities in Idaho amend the state code?
Local amendments are adopted by ordinance at the city or county level. Confirm with the building department that reviews your permit.
Check a plan set against Idaho code
Knowing the adopted edition is the easy half. Architechtura reads your drawings, resolves which of these provisions actually apply to the project, and returns the corrections a plan checker would write up, each one cited to the section it came from.
Your first check is free, no card required.
Compiled from published state and municipal adoption ordinances. Local governments amend their codes on their own schedule, and a pending ordinance can change what applies to your permit. Confirm the governing edition with the building department before you submit. This page is reference information, not a code determination.