Montana building codes for roof replacement
Montana enforces a residential code statewide.
The latest edition of the Montana state building code is based on the 2018 IBC and 2018 IRC, is effective as of 12/07/2019, and is mandatory statewide. The previous edition was based on the 2012 IBC and 2012 IRC and was effective until 12/06/2019.
Adopted editions across Montana
- 56 counties on the 2021 IRC
Counties in Montana
County pages for Montana are not published yet. The adoption data above covers the whole state.
Adoption data: FEMA Building Code Adoption Tracking (BCAT).