Do I Need a Permit to Replace My Roof in Montana?
Roof replacement permit requirements. When you need a permit, the two-layer rule, and what inspectors check.
Yes — all roof replacements and re-roofing projects require a permit.
Always Need a Permit
Most jurisdictions require a roofing permit for all roof replacements, whether you're doing a full tear-off or an overlay. The permit ensures proper installation of underlayment, flashing, ice and water shield, and ventilation. Roofing permits are the fastest to obtain — often same-day approval.
The Two-Layer Rule
The IRC/IBC allow a maximum of two roofing layers in most adopting jurisdictions. If your home already has two layers of shingles, a full tear-off is required before installing new roofing. This is a common surprise for homeowners — the inspector will check during the deck inspection.
What Inspectors Check
Two inspections: deck/substrate (after tear-off, verify sheathing condition and replace damaged decking) and final (ice and water shield in valleys and eaves, proper flashing at penetrations and walls, drip edge, adequate ventilation, and correct nailing pattern).
Insurance Claims
If you're replacing your roof due to hail or wind damage, the insurance claim process is separate from the permit. Your roofer will typically handle the permit while you work with your adjuster. Make sure the replacement materials match or exceed what's specified in the insurance scope.
Yes, always. Roofing permits are fast ($50-$100, often same-day) with two inspections. No reason to skip it.
Permit fees by city in Montana
Verified from each city’s published fee schedule. Where a city has no separate fee listed for this project, open the city page for the current requirements and amount.
| City | Permit fee | Source |
|---|---|---|
| Anaconda-Deer Lodge | $12.50Verifiedvia Residential Building Permit (New Construction) | Residential Building Permit (New Construction) → |
| Belgrade | Valuation x 0.0024Verifiedvia Residential Building Permit (New Construction, ADU, Addition, Remodel) | Residential Building Permit (New Construction, ADU, Addition, Remodel) → |
| Billings | $30.00 minimum ($1-$1,000 valuation), scaling per the Residential and Commercial Building Permit Fees tableVerified | Re-Roofing Permit → |
| Bozeman | Assessed per the Building Division's current fee schedule (formula/valuation-based per Sec. 10.02.020)Verified | Re-Roof Permit → |
| Butte-Silver Bow | $75.00 per hour, one-hour minimumVerified | Roofing Permit → |
| Choteau | See city page for the current Residential Building Permit (New Construction / Addition / Alteration) fee | Residential Building Permit (New Construction / Addition / Alteration) → |
| City of Deer Lodge | $20Verifiedvia Residential Building Permit (New Construction / Addition / Remodel) | Residential Building Permit (New Construction / Addition / Remodel) → |
| Colstrip | See city page for the current Residential Building Permit (New Construction / Addition / Alteration / Repair / Move) fee | Residential Building Permit (New Construction / Addition / Alteration / Repair / Move) → |
| Columbia Falls | Calculated at time of submission based on project valuation (field left blank on the application form)Verified | Re-Roofing Permit → |
| Conrad | See city page for the current Zoning and Building Permit (New Construction / Addition / Alteration / Repair) fee | Zoning and Building Permit (New Construction / Addition / Alteration / Repair) → |
| Cut Bank | $23.50 (subject to the $100.00 minimum permit fee)Verifiedvia Residential Building Permit (New Construction / Addition / Alteration) | Residential Building Permit (New Construction / Addition / Alteration) → |
| Darby | $29.38Verifiedvia Building Permit (New Construction, Addition, Alteration, Repair) | Building Permit (New Construction, Addition, Alteration, Repair) → |
| East Helena | See city page for the current Construction Permit — Residential Building (New Construction / Addition / Remodel) fee | Construction Permit — Residential Building (New Construction / Addition / Remodel) → |
| Forsyth | See city page for the current Residential Building Permit (New Construction / Addition / Alteration) fee | Residential Building Permit (New Construction / Addition / Alteration) → |
| Glasgow | See city page for the current Residential Building Permit (New Construction / Addition / Alteration) fee | Residential Building Permit (New Construction / Addition / Alteration) → |
| Great Falls | Determined by declared roofing project valuation against the Exhibit A table (e.g., $105.34 for $3,001-$4,000 in value)Verified | Roofing Permit (Reroof) → |
| Hamilton | $50.00Verified | Roof Permit → |
| Hardin | See city page for the current Residential Building Permit (New Construction / Addition / Alteration / Re-Roof) fee | Residential Building Permit (New Construction / Addition / Alteration / Re-Roof) → |
| Havre | See city page for the current Roofing Permit (Repair or Replacement) fee | Roofing Permit (Repair or Replacement) → |
| Helena | Per Ordinance 3134 Building Permit Fee Tabulation table (same table used for building permits generally)Verified | Roofing Permit (Reroof) → |
| Kalispell | $23.50 minimum (valuation $1-$500) scaling to $6,444.85 for the first $1,000,000 plus $5.25 per additional $1,000 over $1,000,000Verified | Roofing Permit (Reroof) → |
| Laurel | See city page for the current Roofing Permit (Residential / Commercial) fee | Roofing Permit (Residential / Commercial) → |
| Lewistown | See city page for the current Residential Building Permit (New Construction / Additions) fee | Residential Building Permit (New Construction / Additions) → |
| Libby | $24Verifiedvia Residential Building Permit (New Construction / Addition / Alteration / Repair) | Residential Building Permit (New Construction / Addition / Alteration / Repair) → |
| Livingston | $23.50 minimum ($1.00-$500.00 valuation), scaling per the City of Livingston Fee Schedule Building Fees tableVerified | Re-Roofing Permit → |
| Manhattan | See city page for the current Residential Building Permit (New Construction, Addition, Remodel) fee | Residential Building Permit (New Construction, Addition, Remodel) → |
| Miles City | Set by City of Miles City fee schedule adopted by council resolution under City Code § 5-4; specific dollar-valuation table not independently locatable as a standalone published document as of this reviewVerified | Roofing Permit → |
| Missoula | $281.00Verified | Residential Re-Roof Permit → |
| Missoula County (Unincorporated) | $125.00Verified | Roofing Permit → |
| Polson | 35% of the Building Permit FeeVerifiedvia Zoning Conformance & Building Permit (New Construction / Addition / Remodel) | Zoning Conformance & Building Permit (New Construction / Addition / Remodel) → |
| Red Lodge | See city page for the current Residential Building Permit (New Construction / Addition / Alteration) fee | Residential Building Permit (New Construction / Addition / Alteration) → |
| Ronan | $35.00 for up to $1,999Verifiedvia Building Permit (New Construction / Addition / Alteration / Repair) | Building Permit (New Construction / Addition / Alteration / Repair) → |
| Shelby | $23.50Verifiedvia Building Permit (New Construction / Addition / Structural Alteration) | Building Permit (New Construction / Addition / Structural Alteration) → |
| Sidney | $23.50Verifiedvia Residential Building Permit | Residential Building Permit → |
| Stevensville | $35 (minimum fee)Verifiedvia Building Permit (New Construction / Addition / Remodel) | Building Permit (New Construction / Addition / Remodel) → |
| Townsend | See city page for the current Building Permit — Residential Building (New Construction / Addition / Remodel) fee | Building Permit — Residential Building (New Construction / Addition / Remodel) → |
| Troy | $24Verifiedvia Residential Building Permit (New Construction / Addition / Alteration / Repair) | Residential Building Permit (New Construction / Addition / Alteration / Repair) → |
| Unincorporated Yellowstone County | Calculated based on project valuation; contact Building Codes Bureau at (406) 841-2056 for current fee tableVerified | Roofing Permit (Reroof) → |
| West Yellowstone | See city page for the current Residential Building Permit (New Construction / Addition / Alteration / Repair) fee | Residential Building Permit (New Construction / Addition / Alteration / Repair) → |
| Whitefish | Based on a percentage of the estimated project cost/valuation, consistent with the City's general building-permit valuation-based fee methodology; a deposit is required at time of permit submittalVerified | Re-Roofing Permit → |