Montana Building and Residential Codes

The Building Codes Program (BC Program) is part of the Commercial Measurements Bureau within the Montana Department of Labor & Industry’s Business Standards Division.  The BC Program is responsible for adopting a uniform state building code, which is enforced statewide for residential and commercial buildings.  The 2021 International Building Code (IBC) and the 2021 International Residential Code (IRC) are incorporated by reference. 

Cities, counties and towns have the option to enforce local building codes. These local building code enforcement programs must be certified by the BC Program. The cities, counties and towns that choose not to enforce building codes, fall under the jurisdiction of the BC Program. The Montana Building Codes Council exists for the purpose of assisting the department with the application, implementation, and interpretation of the state building code and building codes adopted by counties, cities, or towns.

Building Code Compliance Software for Montana

Plan Analyst code compliance software programs make it easy for building officials, architects and other designers to quickly perform commercial and residential building code plan reviews / code studies.  Plan Analyst for the 2021 IBC and Plan Analyst for the 2021 IRC simplifies the plan review / code study process enabling compliance to specific code years.  This proven software allows modifications to accommodate local amendments, where applicable.  Users have the ability to add code requirements and to add to the checklist.  Changes can be made permanent by changing the data file using the setup section of Plan Analyst, or specific reports can be edited for special conditions.

Plan Analyst Calculators: Deck – Sign – Beam & Column

Plan Analyst Deck, Sign and Beam & Column Calculators are additional simple and effective design and code review software tools that will quickly become your go-to resources when working on associated tasks.

Users of Plan Analyst in Montana have included:

City of BozemanHessler Architects
City of Great FallsBitnar Architects
City of HelenaFullerton Architects PC
City of KalispellBitterroot Engineering & Design
City of MissoulaStevenson Design
City of Red LodgeProcess Architecture PC
City of WhitefishSeabury Design Associates
Missoula CitySpectrum Group Architects PC

Building and Residential Code Resources in Montana

Energy Code Compliance Software for Montana

Visit the U.S. Department of Energy website to see the latest on energy code adoption in Montana, including the use of COMcheck and REScheck Energy Code compliance software. COMcheck enables architects, builders, designers, and contractors to determine whether new commercial or high-rise residential buildings, additions, and alterations meet the requirements of the IECC and ASHRAE Standard 90.1.  REScheck product enables builders, designers, and contractors to determine whether new homes, additions, and alterations meet the requirements of the IECC or a number of state energy codes.

The “Building Codes Assistance Project” also provides information on Montana’s building energy codes.

FEMA Building Code Adoption Tracking

The FEMA Building Code Adoption Tracking program reports on the status of hazard-resistant building code adoption in each state. Montana is in FEMA Region 8. Read the 2023 Region 8 fact sheet showing the annual metric of the percent of communities adopting hazard-resistant building codes in Montana.


American Institute of Architects – AIA Montana represents architects in the state.  There are nearly 1,500 registered and reciprocal architects in Montana.

Montana has an ICC Chapter.

Montana code adoption status on the ICC website