Adopted Codes

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Building Code Update

Montana plans to adopt the 2024 ICC family of codes in mid-2026. Kindly ensure your designs comply with the code cycle in effect at the time of submitting building permit applications. Further details will be published here on this website as they become available.

Current Codes - State of Montana Adopted Building Codes

Administration Rules of Montana (ARM) Rule 24.301.202 for Local Government Enforcement.

Residential Building Codes (Single-Family, Two-Family, & Townhouse)

2021 International Residential Code (IRC)
- ARM Rule 24.301.154
- ARM Deleted Chapters 11 thru 14 and Chapters 16 thru 43.
- Appendix Q Tiny Houses- Adopted
2021 International Mechanical Code (IMC)
- ARM Rule 24.301.172
2021 International Fuel Gas Code (IFGC)
- ARM Rule 24.301.173
2021 International Energy Conservation Code (IECC)
- ARM Rule 24.301.161
- Appendix RB – Solar Ready Provisions – Adopted
2020 National Electrical Code (NEC)
- ARM Rule 24.301.401
2021 Uniform Plumbing Code (UPC) (IAPMO)
- ARM Rule 24.301.301

Commercial

2021 International Building Code (IBC)
- ARM Rule 24.301.146
2021 International Mechanical Code (IMC)
- ARM Rule 24.301.172
2021 International Fuel Gas Code (IFGC)
- ARM Rule 24.301.173
2021 International Energy Conservation Code (IECC)
- ARM Rule 24.301.161
ICC A117.1-2017 Standard for Accessible and Usable Buildings and Facilities
- ARM Subchapter 24.301.9
2021 International Existing Building Code (IEBC)
- ARM Rule 24.301.171
2020 National Electrical Code (NEC)
- ARM Rule 24.301.401
2021 Uniform Plumbing Code (UPC) (IAPMO)
- ARM Rule 24.301.301
2021 international Swimming Pool and Spa Code
- ARM Rule 24.301.175
2021 International Fire Code
- ARM Rule 23.12.601
- Admin Order 2023-04 Adoption of 2021 Fire Code
Other Related ARM Rules
- Subchapter 24.301.6 Elevators, Escalators, and Moving Walks
- Subchapter 24.301.7 Boiler Safety

Old Codes

Previously Adopted Codes

Adopted 3/22/2021

2018 International Energy Conservation Code

Adopted 3/1/2020

2018 International Building Code
2018 International Residential Building Code
2018 International Existing Building Code
2018 International Mechanical Code
2018 International Fuel Gas Code
2018 Uniform Plumbing Code
2017 National Electrical Code
2018 international Swimming Pool and Spa Code

ARM Modifications to the Adopted 2018 Building Codes

Adopted 1/12/2015

2012 International Building code
2012 International Residential Building Code (One and Two Family Dwellings)
2012 International Existing Building Code
2012 International Mechanical Code
2012 International Fuel Gas Code
2012 Energy Conservation Code
2012 Uniform Plumbing Code
2014 National Electric Code
2009 ICC A117.1 Accessible and Usable Buildings and Facilities

ARM Modifications to the Adopted 2012 Building Codes

Adopted 9/23/2013

2012 International Fire Code (IFC)

Adopted 9/1/2010

2009 International Building Code (IBC)
2009 International Existing Building Code (IEBC)
2009 International Fuel Gas Code (IFGC)
2009 International Mechanical Code (IMC)
2011 National Electric Code (NEC)
2009 Uniform Plumbing Code (UPC)

Adopted 3/26/2010

2009 International Energy Conservation Code (IECC)

Adopted 2/01/2007

2006 International Building Code (IBC)
2006 International Residential Code (IRC)
2006 International Existing Building Code (IEBC)
2006 International Mechanical Code (IMC)
2006 International Fuel Gas Code (IFGC)
2005 NFPA 99C- Medical Gas and Vacuum Systems
2006 Uniform Plumbing Code (UPC)

Adopted 5/23/2006

2005 National Electric Code (NEC)

Additional Information

State of Montana Building Codes Division
PO Box 200517 - 301 S. Park, Rooms 430
Helena, MT 59620-0517
Main Switchboard: 406-841-2040
Plan Review Services: 406-841-2056
Fax: 406-841-2050