The City publishes a page on accessory dwelling units and duplexes, the housing types most affected by Montana's recent housing legislation and by the code work that followed the MontanaLandUsePlanningAct.
An ADU is a secondary dwelling on a lot with a principal dwelling. Where and on what terms one may be built is a zoning question under Title 17 of the OfficialCode, and applications and forms go through PlanningAndCommunityDevelopment.
Housing supply is a recurring theme in the Commission record: the growth management public engagement report taken at WorkSession2025-05-20, the workforce housing and TaxIncrementFinancing update at SpecialWorkSession2025-07-15, the housing elements of FutureGreatFalls2045, and the annexations that add subdivision capacity — AnnexationProcess.
If you are looking for the current standards, go to the City's ADU page and the Land Development Code rather than relying on this summary; this area of the code has been under revision.
Accessory dwelling units and duplexes: https://greatfallsmt.gov/1080/Accessory-Dwelling-Untis-and-Duplexes Planning forms: https://greatfallsmt.gov/1117/Planning-Forms
ZoningOrdinances · PlanningAndCommunityDevelopment · Categories