Zoning Guide

Great Falls Zoning & Land Use Guide

Last updated: Verified:

Official references and local checks

Use the official references below to identify the rules that apply to your address, then confirm parcel-specific requirements with the local authority before filing an application.

Official references

Population:
60,442
County:
Cascade County
State building code:
Montana Building Codes Bureau administers code (based on 2021 IBC)(statewide default)
State ADU law:
Yes — Montana SB 528 (2023), codified at MCA 76-2-345, requires municipalities to adopt regulations allowing at least one accessory dwelling unit by right on a lot containing a single-family dwelling. SB 382 (2023, the Montana Land Use Planning Act) separately reorganized how larger Montana cities plan for housing.
FEMA flood map:
Search flood zones
Municipal code:
View code online
Zoning map:
View local zoning map

Before you apply

  • Call the City of Great Falls Planning & Community Development: (406) 455-8432
  • Search the municipal code for the chapter that covers your zoning district and proposed use.
  • Use the local zoning map to look up your parcel's zoning designation before applying for a permit.
  • Check FEMA flood zone for your parcel — flood-zone status changes setbacks, foundation requirements, and insurance.
  • Check your HOA CC&Rs and recorded deed restrictions — they are common in Great Falls and frequently restrict ADUs, fences, and exterior changes beyond what zoning allows.

Key Zoning Facts

Local Zoning / Building Office
City of Great Falls Planning & Community Development(406) 455-8432
Building Code Edition
Montana Building Code (based on 2021 IBC)
ADU / Accessory Apartment
Verify by district

Regulatory Layers That Apply in Great Falls

Your property is subject to ALL of these regulatory layers. Each one can impose additional requirements beyond the others.

Federal

State — Montana

  • Building Code: Montana Building Code (based on 2021 IBC)
  • State ADU Override: Yes (SB 528 and HB 211)
View Montana zoning overview

County — Cascade County

    City / Municipal

    The municipality's zoning ordinance, building-code enforcement, and local permits form the primary local layer of land-use regulation for your property.

    Overlay Districts

    No overlay districts identified.

    Private Restrictions

    • Private covenants, deed restrictions, condominium rules, or association rules can impose requirements beyond zoning.
    • Check HOA CC&Rs for additional restrictions.

    Statewide Context (Montana)

    Local data for Great Falls is limited. The following state-level facts apply across Montana and are inherited by this page until city-specific details are verified.

    State Building Code
    Montana Building Codes Bureau administers code (based on 2021 IBC)
    State ADU Preemption
    Yes — state law overrides local rules
    Coastal Zone
    No
    Wildfire Zones
    Yes

    ADU Rules in Great Falls

    ADUs:Allowed(statewide context — not city-specific)
    Max Size
    900 sq ft
    Max Height
    24 ft
    Rear Setback
    5 ft
    Side Setback
    5 ft
    Parking
    Verify with local jurisdiction
    Owner Occupancy
    Not required (per state law)
    Permit Timeline
    3-5 weeks
    Full ADU rules for Great Falls →

    Permit Costs & Timelines

    Check Current Permit Fees & Timelines

    Permit fees and review times can vary by project type, scope, valuation, and required approvals. Check the current schedule with the local permitting authority before filing.

    Check current Great Falls permit information →

    Official Sources

    City-specific

    City of Great Falls Planning & Community Developmentgreatfallsmt.netOfficial sourceGreat Falls Municipal Codelibrary.municode.comOfficial source