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Roofing Permit (Reroof) in Unincorporated Yellowstone County, Montana

Reroofing is listed as a 'Type of Work' option (Reroof) on the Montana state Application for Building Permit. Because most single-family and up-to-fourplex residential structures are exempt from the state building permit requirement in Montana (private homes/apartments with four or fewer units not serving transient guests), a straightforward residential re-roof on an exempt dwelling generally does NOT require a state building permit. Confirm applicability with the Building Codes Bureau for your specific structure.

Verified 2026-07-02 · Source

When you need this permit

  • Reroofing on an exempt residential structure (4 or fewer units, non-transient) generally does not require a state building permit
  • Reroofing on a non-exempt structure (5+ unit residential, commercial, or other non-exempt building) requires a state Building Permit with 'Reroof' selected as the Type of Work
  • Confirm with the Building Codes Bureau at (406) 841-2056 whether your specific reroof project requires a permit

Required documents

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Fee schedule

State Building Permit Fee (if applicable)Only applies to non-exempt structures; most residential re-roofs on 1-4 unit dwellings are exempt from the state building permit entirely
Calculated based on project valuation; contact Building Codes Bureau at (406) 841-2056 for current fee table

Review timeline

Plan reviewTypical estimate — confirm current times with the Unincorporated Yellowstone County building department
~15–21 business days

How long did your Roofing Permit (Reroof) permit actually take in Unincorporated Yellowstone County?

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

Inspection process

    See the full Unincorporated Yellowstone County inspection guide — scheduling & re-inspection fees →

    Tips

    • Because Montana exempts private homes and apartments of four or fewer units from the state building permit requirement, most homeowners in unincorporated Yellowstone County reroofing a single-family home will not need any permit — county or state.
    • If your roof replacement is on a duplex, triplex, fourplex, or larger structure, or you are unsure of your exemption status, call the Building Codes Bureau at (406) 841-2056 before starting work.

    Frequently asked questions

    In most cases, no. Yellowstone County issues no building permits outside Billings city limits, and Montana's state building permit exemption for private homes/apartments with four or fewer units generally covers a residential reroof. Confirm with the Montana Building Codes Bureau at (406) 841-2056 if your structure has 5+ units or you are unsure.

    In Unincorporated Yellowstone County, the published State Building Permit Fee (if applicable) is: Calculated based on project valuation; contact Building Codes Bureau at (406) 841-2056 for current fee table. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

    Plan review for a roofing permit (reroof) in Unincorporated Yellowstone County typically runs 15–21 business days. This is an estimate, not a published figure — confirm current review times with Montana Department of Labor & Industry — Building Codes Bureau (Business Standards Division, Building and Commercial Measurements Bureau) at (406) 841-2056.

    Depending on your project, Unincorporated Yellowstone County may also ask for: Application for Building Permit (BCP-1) — Reroof. See the required-documents checklist on this page for details on each.

    Apply through Montana Department of Labor & Industry — Building Codes Bureau (Business Standards Division, Building and Commercial Measurements Bureau) at 301 South Park Ave, Floors 4-5, Helena, MT 59620 (mailing: Building Codes Bureau, PO Box 200517, Helena, MT 59620-0517). Phone: (406) 841-2056, email: buildingcodes@mt.gov. Office hours: Mon–Fri, state business hours; online permitting available 24/7 via https://aca-prod.accela.com/bcb/. Official information: https://bsd.dli.mt.gov/building-codes-permits/.

    Unincorporated Yellowstone County, Montana has adopted: 2021 International Building Code (IBC) — adopted statewide by ARM Title 24, Chapter 301; effective June 11, 2022; 2021 International Residential Code (IRC) — ARM Title 24, Chapter 301; effective June 11, 2022; 2021 International Existing Building Code (IEBC) — ARM Title 24, Chapter 301; effective June 11, 2022; ICC A117.1-2017 (Accessibility) — ARM Title 24, Chapter 301; effective June 11, 2022; 2021 Uniform Plumbing Code (UPC) — ARM Title 24, Chapter 301; effective June 11, 2022 (fixture table at ARM 24.301.351); 2021 International Mechanical Code (IMC) — ARM Title 24, Chapter 301; effective June 11, 2022; 2021 International Fuel Gas Code (IFGC) — ARM Title 24, Chapter 301; effective June 11, 2022; 2020 National Electrical Code (NEC) — ARM Title 24, Chapter 301; effective June 11, 2022 (NEC Technical Advisory NEC_TIA-23-3_210.8 issued August 12, 2022); 2021 International Energy Conservation Code (IECC) — ARM Title 24, Chapter 301; effective June 11, 2022; 2021 International Swimming Pool and Spa Code (ISPSC) — ARM Title 24, Chapter 301; effective June 11, 2022; 2021 Wildland Urban Interface Code (WUIC) — ARM Title 24, Chapter 301; effective June 11, 2022; NOTE: All codes listed are statewide codes administered directly by the Montana Building Codes Bureau for areas (like unincorporated Yellowstone County) that are NOT within a certified local-government building code jurisdiction..

    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 Unincorporated Yellowstone County building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.

    Other permits in Unincorporated Yellowstone County

    Residential Building PermitElectrical PermitPlumbing PermitMechanical / HVAC PermitSolar Panel PermitAccessory Dwelling Unit (ADU)Water Heater PermitElectric Vehicle (EV) Charging Station / EVSE Permit (State Electrical Permit)Sign PermitFire Sprinkler / Fire Alarm PermitChange of Use / Zoning Compliance Permit

    Roofing Permit (Reroof) in other cities

    Billings, MontanaBozeman, MontanaButte-Silver Bow, MontanaColumbia Falls, MontanaGreat Falls, MontanaHamilton, MontanaHavre, MontanaHelena, Montana

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