Montana Zoning & Land Use Guide
Last updated: Verified:
Comprehensive guide to Montana zoning laws, building codes, and land use regulations.
Key Facts
- Building Code: Montana Building Codes Bureau administers code (based on 2021 IBC)
- State ADU Law: Yes — ADU-friendly
- ADU Details: SB 245 (2023) removes several local government barriers to ADU construction, prohibiting local jurisdictions from requiring owner occupancy, imposing separate utility connections where unnecessary, or mandating additional off-street parking for ADUs.
Cities in Montana
Anaconda-Deer Lodge
Pop. 9,153
ADU: Allowed
Belgrade
Pop. 11,411
ADU: Allowed
Billings
Pop. 119,035
ADU: Allowed
Bozeman
Pop. 53,293
ADU: Allowed
Butte-Silver Bow
Pop. 34,751
ADU: Allowed
Columbia Falls
Pop. 5,835
ADU: Allowed
Glendive
Pop. 4,873
ADU: Allowed
Great Falls
Pop. 60,442
ADU: Allowed
Hamilton
Pop. 4,959
ADU: Allowed
Havre
Pop. 9,846
ADU: Allowed
Helena
Pop. 32,091
ADU: Allowed
Kalispell
Pop. 26,884
ADU: Allowed
Laurel
Pop. 7,340
ADU: Allowed
Lewistown
Pop. 5,952
ADU: Allowed
Livingston
Pop. 8,040
ADU: Allowed
Miles City
Pop. 8,410
ADU: Allowed
Missoula
Pop. 73,489
ADU: Allowed
Polson
Pop. 5,043
ADU: Allowed
Sidney
Pop. 6,844
ADU: Allowed
Whitefish
Pop. 8,032
ADU: Allowed
Disclaimer: The information on this website is provided for general informational purposes only and does not constitute legal, financial, or professional advice. Always verify current requirements with your local planning department.