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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) o ARM Rule 24.301.154 o ARM Deleted Chapters 11 thru 14 and Chapters 16 thru 43. o Appendix Q Tiny Houses- Adopted • 2021 International Mechanical Code (IMC) o ARM Rule 24.301.172 • 2021 International Fuel Gas Code (IFGC) o ARM Rule 24.301.173 • 2021 International Energy Conservation Code (IECC) o ARM Rule 24.301.161 o Appendix RB – Solar Ready Provisions – Adopted • 2020 National Electrical Code (NEC) o ARM Rule 24.301.401 • 2021 Uniform Plumbing Code (UPC) (IAPMO) o ARM Rule 24.301.301 Commercial • 2021 International Building Code (IBC) o ARM Rule 24.301.146 • 2021 International Mechanical Code (IMC) o ARM Rule 24.301.172 • 2021 International Fuel Gas Code (IFGC) ---PAGE BREAK--- o ARM Rule 24.301.173 • 2021 International Energy Conservation Code (IECC) o ARM Rule 24.301.161 • ICC A117.1-2017 Standard for Accessible and Usable Buildings and Facilities o ARM Subchapter 24.301.9 • 2021 International Existing Building Code (IEBC) o ARM Rule 24.301.171 • 2020 National Electrical Code (NEC) o ARM Rule 24.301.401 • 2021 Uniform Plumbing Code (UPC) (IAPMO) o ARM Rule 24.301.301 • 2021 international Swimming Pool and Spa Code o ARM Rule 24.301.175 • 2012 International Fire Code o ARM Rule 23.12.601 • Other Related ARM Rules o Subchapter 24.301.6 Elevators, Escalators, and Moving Walks o Subchapter 24.301.7 Boiler Safety