Roofing Permit (Reroof) in Unincorporated Yellowstone County, Montana
VerifiedReroofing 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
- Optional
Application for Building Permit (BCP-1) — Reroof
Only required for non-exempt structures; 'Reroof' is a checkbox under Type of Work on the standard state Building Permit application
Fee schedule
| Fee type | Amount | Notes |
|---|---|---|
| State Building Permit Fee (if applicable) | Calculated based on project valuation; contact Building Codes Bureau at (406) 841-2056 for current fee table | Only applies to non-exempt structures; most residential re-roofs on 1-4 unit dwellings are exempt from the state building permit entirely |
Review timeline
~15–21 business days
Typical estimate — confirm current times with the Unincorporated Yellowstone County building department
Inspection process
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
- Do I need a permit to reroof my house in unincorporated Yellowstone County?
- 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.
Sources & verification
Verified against official sources. Last reviewed 2026-07-02.
- Montana Department of Labor & Industry — Building Codes Bureau (Business Standards Division, Building and Commercial Measurements Bureau) — official building department
- Montana Building Codes Bureau — Application for Building Permit (BCP-1, Rev. 11/25) — 'Reroof' listed as Type of Work
- Montana Building Codes Bureau — Building Permits (exemptions)
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.
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