Who enforces each one, what edition applies, and what changes next. 6 of 7 areas verified on primary sources. Federal OSHA state.
| Area | In force | Authority | Next |
|---|---|---|---|
| Fire | No single statewide model fire code; DOJ oversees/approves locally-adopted codes (MCA Title 50 ch.61)State law (Title 50 ch.61) covers assembly, business, educational, industrial, institutional, and residential (incl. hotels) buildings; DOJ approves local fire-agency inspection programs; no specific IFC/NFPA edition is named in statute. SourceVerified on the source | Montana DOJ, Fire Prevention & Investigation Section (Div. of Criminal Investigation) statewide; DOJ-approved local fire agencies locally | In forceIn force; no adopted-but-pending edition found |
| Building | 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. SourceVerified on the source | Montana DLI Building Codes Bureau (Business Standards Div.) statewide; certified city/county/town programs enforce locally | In forceNew editions took effect Sep 26, 2026 |
| Elevators | ASME A17.1-2019 (elevators) and A17.3-2017 (existing elevators), via ARM 24.301DLI licenses/inspects elevators statewide under ASME A17.1-2019/A17.3-2017 (eff. Jun 11, 2022); annual safety inspection is required before an operating certificate is issued; no pending edition update found. SourceVerified on the source | Montana DLI Building and Commercial Measurements Bureau | In force |
| Boilers | ASME Boiler and Pressure Vessel Code, 2021 edition, via ARM 24.301DLI Building and Commercial Measurements Bureau issues boiler operating certificates under the 2021 ASME BPVC (eff. Nov 6, 2021); this run could not confirm the certificate renewal/inspection cadence from a reachable page. SourceReported, in verification | Montana DLI Building and Commercial Measurements Bureau | In force |
| Pools | Construction: 2024 Int'l Swimming Pool & Spa Code (ARM 24.301); Operation/licensing: MCA Title 50 ch.53DPHHS and local health officers license and inspect public pools/spas for sanitation and safety (Title 50 ch.53); DLI separately sets pool/spa construction standards, updated to the 2024 edition effective Sep 26, 2026. SourceVerified on the source | DPHHS and local health officers (licensing/sanitation); DLI (construction code), statewide | In forceConstruction code updated Sep 26, 2026 |
| Lodging | Hotel/motel license required statewide (MCA Title 50 ch.51)DPHHS licenses hotels/motels statewide; local health officers inspect and validate licenses. No hotel-specific balcony/sprinkler-retrofit statute found; the general public-building fire-safety law (ch.61) covers hotels via DOJ/local fire enforcement. SourceVerified on the source | DPHHS (licensing) statewide; local health officers inspect/validate | In force |
| Workplace | Federal OSHA jurisdiction; no Montana State PlanMontana has no OSHA-approved State Plan; federal OSHA (29 CFR) covers private-sector workplace safety statewide. No state agency administers a parallel workplace-safety program for private employers. SourceVerified on the source | Federal OSHA, U.S. Dept. of Labor | In force |
No single statewide model fire code; DOJ oversees/approves locally-adopted codes (MCA Title 50 ch.61). State law (Title 50 ch.61) covers assembly, business, educational, industrial, institutional, and residential (incl. hotels) buildings; DOJ approves local fire-agency inspection programs; no specific IFC/NFPA edition is named in statute. Enforced by: Montana DOJ, Fire Prevention & Investigation Section (Div. of Criminal Investigation) statewide; DOJ-approved local fire agencies locally.
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. Enforced by: Montana DLI Building Codes Bureau (Business Standards Div.) statewide; certified city/county/town programs enforce locally.
Elevators: Montana DLI Building and Commercial Measurements Bureau (ASME A17.1-2019 (elevators) and A17.3-2017 (existing elevators), via ARM 24.301). Boilers: Montana DLI Building and Commercial Measurements Bureau (ASME Boiler and Pressure Vessel Code, 2021 edition, via ARM 24.301).
Montana is a federal-OSHA state: the U.S. Department of Labor's OSHA enforces workplace safety rules directly.
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 24.301.
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