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Accessory Dwelling Unit (ADU) Permit in Bozeman, Montana

Required for construction of an accessory dwelling unit on a residential property in Bozeman. ADUs require both zoning/Planning review and a Building Permit, plus a unique street address.

Verified 2026-07-02 · Source

When you need this permit

  • Building permit review required in addition to Planning/zoning review of ADU eligibility for the specific lot and zoning district
  • ADUs (and any additional dwelling unit on a lot) require a unique address, separate from the primary address on the property — request via building@bozemanmt.gov
  • For planning/zoning eligibility questions specific to a property, contact PlanningTech@bozemanmt.gov

Required documents

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Fee schedule

Building Permit Fee (formula-based, same as residential new construction/addition)Bozeman Municipal Code Sec. 10.02.020, as amended by Ordinance 2143 (2023); ADUs are not billed under a separate fee category from other residential construction in the ordinance text reviewed
(Administrative Charges/Employee/Hour + Inspector's Hourly Pay Rate) x Table A factor x Building Square Footage

Review timeline

Plan reviewTypical estimate — confirm current times with the Bozeman building department
~10–15 business days

How long did your Accessory Dwelling Unit (ADU) Permit permit actually take in Bozeman?

Anonymous — one question, no email. Answers are combined and only shown once at least 5 people have reported.

Inspection process

  1. 1

    Foundation/Framing

    Same inspection sequence as new residential construction

  2. 2

    Final

    Final inspection prior to occupancy

See the full Bozeman inspection guide — scheduling & re-inspection fees →

Tips

  • Request a unique address for the ADU from building@bozemanmt.gov early — this is a documented prerequisite separate from the building permit itself.
  • Confirm zoning eligibility for your specific lot with the Planning Division (PlanningTech@bozemanmt.gov) before designing to a specific size or configuration, since ADU zoning standards (allowed districts, size caps) are set in Bozeman's Unified Development Code (Chapter 38) and were not independently re-verified against a live, current-dated source this review.

Frequently asked questions

Bozeman requires an accessory dwelling unit (adu) permit for: Building permit review required in addition to Planning/zoning review of ADU eligibility for the specific lot and zoning district; ADUs (and any additional dwelling unit on a lot) require a unique address, separate from the primary address on the property — request via building@bozemanmt.gov; For planning/zoning eligibility questions specific to a property, contact PlanningTech@bozemanmt.gov. If your project isn't listed, confirm with City of Bozeman — Community Development, Building Division at (406) 582-2375 ext. 1 before starting work.

In Bozeman, the published Building Permit Fee (formula-based, same as residential new construction/addition) is: (Administrative Charges/Employee/Hour + Inspector's Hourly Pay Rate) x Table A factor x Building Square Footage. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Plan review for an accessory dwelling unit (adu) permit in Bozeman typically runs 10–15 business days. This is an estimate, not a published figure — confirm current review times with City of Bozeman — Community Development, Building Division at (406) 582-2375 ext. 1.

You'll need: Building Permit Application (ProjectDox). See the required-documents checklist on this page for details on each.

Bozeman requires 2 inspection(s) for an accessory dwelling unit (adu) permit, in order: Foundation/Framing, Final. Schedule each through City of Bozeman — Community Development, Building Division ((406) 582-2375 ext. 1).

Apply through City of Bozeman — Community Development, Building Division at 20 East Olive Street, Bozeman, MT 59715 (Professional Building front counter); mailing/administration at 121 N Rouse Ave, Bozeman, MT 59715. Phone: (406) 582-2375 ext. 1, email: building@bozemanmt.gov. Office hours: Professional Building front counter (20 East Olive St.): Mon, Wed, Fri 9am-4pm; Tue, Thu 9am-1pm. Plans Examiner appointments (commercial or residential) bookable via Vagaro, 30-minute slots daily.. Official information: https://www.bozemanmt.gov/departments/community-development/building.

Bozeman, Montana has adopted: 2021 International Residential Code (IRC) — State of Montana adopted code, ARM 24.301.154 (chapters 11-14 and 16-43 deleted by ARM amendment); Appendix Q (Tiny Houses) adopted; 2021 International Building Code (IBC) — State of Montana adopted code, ARM 24.301.146; 2021 International Mechanical Code (IMC) — ARM 24.301.172; 2021 International Fuel Gas Code (IFGC) — ARM 24.301.173; 2021 International Energy Conservation Code (IECC) — ARM 24.301.161; Appendix RB (Solar Ready Provisions) adopted; 2020 National Electrical Code (NEC) — ARM 24.301.401; 2021 Uniform Plumbing Code (UPC, IAPMO) — ARM 24.301.301; 2021 International Existing Building Code (IEBC) — ARM 24.301.171 (commercial); 2021 International Swimming Pool and Spa Code — ARM 24.301.175 (commercial); 2021 International Fire Code — ARM 23.12.601, Admin Order 2023-04; ICC A117.1-2017 Standard for Accessible and Usable Buildings and Facilities — ARM Subchapter 24.301.9 (commercial); NOTE: Montana plans to adopt the 2024 ICC family of codes statewide in mid-2026; the City of Bozeman's Building Division states designs must comply with the code cycle in effect at time of permit application submission and will publish updates when the new cycle takes effect.. Local amendments apply — see the Bozeman overview page for the full list.

Yes. The City of Bozeman requires ADUs and other additional dwelling units on a lot to have a unique address separate from the primary residence's address — request one from building@bozemanmt.gov.

Sources & verification

Verified against official sources. Last reviewed 2026-07-02.

Fees, timelines, and adopted codes are researched from each jurisdiction's published records — see how we verify. Requirements change and vary by project, so always confirm the current details with the Bozeman building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.

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Accessory Dwelling Unit (ADU) Permit in other cities

Great Falls, MontanaHelena, MontanaKalispell, MontanaMissoula, MontanaUnincorporated Yellowstone County, MontanaAlbuquerque, New MexicoArvada, ColoradoAurora, Colorado

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