Montana · Building code

The building code in force in Montana now.

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.

Enter a Montana ZIP code for the building view

Building code in Montana

Verified on the source
In force

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.

Source: primary document

Who enforces it

Montana DLI Building Codes Bureau (Business Standards Div.) statewide; certified city/county/town programs enforce locally

Statewide layer. County and city amendments sit on top; the building view resolves them from your ZIP.

What changes next

In force

New editions took effect Sep 26, 2026

Dated items

Next 24 months
Sep 26, 2026
Statewide switch to 2024-cycle codes: IBC, IRC, Int'l Existing Building Code, Uniform Plumbing Code, Wildland Urban Interface Code, and Int'l Swimming Pool & Spa Code, plus 2023 NEC, all under ARM 24.301Montana DLI Building Codes Bureau
Dated

Questions about the building code in Montana

Which building code applies in Montana today?

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.

Who enforces the building code in Montana?

Montana DLI Building Codes Bureau (Business Standards Div.) statewide; certified city/county/town programs enforce locally.

What changes next for the building code in Montana?

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.

Other areas in Montana

Everything in force in Montana

Priced per building. Your whole team is included.

One address, every authority that can cite it, and a record of who saw what. Cancel anytime. Public pages stay free.