Montana Building Codes and Contacts

The following information is reprinted with permission from the Building Codes Assistance Project:Montana climate zones
Current Commercial Code

2012 IECC with Montana amendments or ASHRAE 90.1-2010
Passed 9/20/2013, effective 11/7/2014

Current Residential Code

2012 IECC with Montana amendments
Passed 9/20/2013, effective 11/7/2014

Due to state amendments, the residential code is not quite equivalent to the 2012. Still, major improvement to the new energy code include:

    • More efficient windows (U-0.32);

More efficient crawlspace walls;

  • Mandatory whole-house blower-door test requirement, beginning 2016;
  • More stringent heating duct leakage testing;
  • Whole-house mechanical ventilation;
  • More efficient lighting (75 percent high efficiency fixtures and lights)

See Administrative Rules of Montana (Title 24, Chapter 301.161) for Incorporation by Reference of the IECC.

Read more about:

Climate Zone: 6B

Code Adoption and Change Process

Code Change Process

Regulatory: The energy codes are reviewed on a three-year cycle corresponding to the adoption of new versions of the International Code Conference (ICC) Uniform Codes. Proposed changes are submitted to the Building Codes Bureau, which must file its proposed rules with the Secretary of State within six months of adoption.

Code Change Cycle

Three-year code review/change cycle.

Next Code Update


Montana Code Contacts

Paul Tschida
Public Education Specialist
Energy Efficiency and Compliance
Department of Environmental Quality

David Cook
Bureau Chief, Business Standards Division
Department of Labor and Industry

Ken Baker
Senior Manager, Codes
Northwest Energy Efficiency Alliance

This information was compiled by the Building Codes Assistance Project, and used with their permission.