Adopted Codes

The following are building codes that have been adopted by the City of Billings.  All codes are modified by the Administrative Rules of Montana.


Complete List
  • International Building Code, 2021 Edition
  • International Energy Conservation Code, 2021 Edition
  • International Existing Building Code, 2021 Edition
  • International Fuel Gas Code, 2021 Edition
  • International Mechanical Code, 2021 Edition
  • International Residential Code (3), 2021 Edition

    • Specifically: (3) Chapters 11 through 14, inclusive, are deleted in their entirety and chapters 16 through 43, inclusive, are deleted in their entirety. Chapter 15, Exhaust Systems, is adopted as an alternative to the International Mechanical Code for exhaust systems only. All other requirements for mechanical systems in detached one- or two-family dwellings and multiple single-family dwellings (townhouses) not more than three stories above grade in height, and their accessory structures, shall be found in the latest adopted edition of the International Mechanical Code.

  • National Electrical Code, 2020 Edition
  • NFPA 99c, Standard on Gas and Vacuum Systems (med gas), 2021 Edition
  • Uniform Plumbing Code, 2021 Edition
  • International Swimming Pool & Spa Code, 2021 Edition