Montana
Updated 3/15/2025
Overview
Montana enforces a statewide building code with amendments, meaning that while the
state adopts and enforces a base set of codes, individual jurisdictions have the authority to
adopt additional amendments or make modifications.
CodePro Uses the Following Codes for Answers:
- 2021 International Residential Code (IRC) + Amendments
- 2021 Uniform Plumbing Code (UPC) + Amendments
- 2020 National Electrical Code (NEC) + Amendments
Additional Resources:
For more details, click here for the state-specific website.
The amendment documents can be difficult to locate on the state website, as they are presented in separate PDF files. Montana has also adopted the 2021 International Building Code, 2021 International Energy Conservation Code, and several other codes with amendments. These codes are enforced at the state level, but local jurisdictions can implement stricter requirements as needed.
The amendment documents can be difficult to locate on the state website, as they are presented in separate PDF files. Montana has also adopted the 2021 International Building Code, 2021 International Energy Conservation Code, and several other codes with amendments. These codes are enforced at the state level, but local jurisdictions can implement stricter requirements as needed.
- Adoption Category
Hybrid
- Amendments
State and Local
Hybrid Adoption
A hybrid adoption system means codes can vary at state and local level. Many times the
state establishes a base code for building regulations and local jurisdictions then have the
authority to amend or adopt more stringent requirements. This allows flexibility for cities
and counties to tailor codes to their specific needs while maintaining a foundational
standard set at the state level.