Do I Need a Permit to Replace My Roof in Montana?
Quick Answer
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.
Bottom Line
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) → |
| 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 → |
| 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) → |
| 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) → |
| Missoula | $281.00Verified | Residential Re-Roof Permit → |
| Unincorporated Yellowstone County | Calculated based on project valuation; contact Building Codes Bureau at (406) 841-2056 for current fee tableVerified | Roofing Permit (Reroof) → |