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. Checked on the primary source; the state record was last reviewed 2026-11-12.

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Building code in Montana

Checked on the source

In force

2024 IBC / IRC / Int'l Existing Building Code + 2023 NEC + 2024 Uniform Plumbing Code (ARM 24.301)

DLI page lists, effective Sept 26, 2026 under ARM 24.301: 2024 IBC, IRC, IEBC, IECC, Mechanical and Fuel Gas codes, 2024 Uniform Plumbing Code, 2023 NEC, 2024 Swimming Pool and Spa Code and Wildland Urban Interface Code, with state amendments. Confirm local enforcement with the AHJ.

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; confirm the local office for the address.

What changes next

Rulemaking pending

2024 editions in force since Sep 26, 2026; DLI current-codes page re-read Oct 20, 2026 lists no proposed rule or pending adoption

What a building has to do

1 recurring duties

These apply when the building has the equipment or fits the type named. The frequency is the standard one; your local official can set a stricter one, so confirm it for the address.

Monthly

Accessible pool entry: a pool lift or sloped entry in place and working whenever the pool is open (pools with 300 or more linear feet of wall need two accessible entries; a spa needs one: lift, transfer wall or transfer system); the rule sets no inspection interval; a monthly check that it works and is charged is common practice2010 ADA Standards §242 and §1009; 28 CFR 36.211 · U.S. Department of Justice (enforced through complaints and lawsuits) · Checked against the source 2026-09-28.

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 page lists, effective Sept 26, 2026 under ARM 24.301: 2024 IBC, IRC, IEBC, IECC, Mechanical and Fuel Gas codes, 2024 Uniform Plumbing Code, 2023 NEC, 2024 Swimming Pool and Spa Code and Wildland Urban Interface Code, with state amendments. Confirm local enforcement with the AHJ.

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?

Rulemaking pending. 2024 editions in force since Sep 26, 2026; DLI current-codes page re-read Oct 20, 2026 lists no proposed rule or pending adoption