2024 IBC / IRC / Int'l Existing Building Code + 2023 NEC + 2024 Uniform Plumbing Code (ARM 24.301). Enforced by Montana DLI Building Codes Bureau (Business Standards Div.) statewide; certified city/county/town programs enforce locally. Verified on the primary source, re-checked weekly.
DLI adopted the 2024 IBC/IRC/IEBC family plus 2023 NEC and 2024 UPC via ARM 24.301, effective Sep 26, 2026, replacing the 2021-cycle codes; state amendments apply statewide.
Source: primary document
Statewide layer. County and city amendments sit on top; the building view resolves them from your ZIP.
New editions took effect Sep 26, 2026
2024 IBC / IRC / Int'l Existing Building Code + 2023 NEC + 2024 Uniform Plumbing Code (ARM 24.301). DLI adopted the 2024 IBC/IRC/IEBC family plus 2023 NEC and 2024 UPC via ARM 24.301, effective Sep 26, 2026, replacing the 2021-cycle codes; state amendments apply statewide.
Montana DLI Building Codes Bureau (Business Standards Div.) statewide; certified city/county/town programs enforce locally.
Nothing is scheduled. The rule above stays in force until the state adopts a newer edition or amends the program; AHJ Radar re-checks the source weekly.
One address, every authority that can cite it, and a record of who saw what. Cancel anytime. Public pages stay free.