Do I Need a Permit to Install Solar Panels in Montana?
Quick Answer
Yes — both a building and electrical permit are required.
Two Permits Required
Solar installations require a building permit (for structural mounting on your roof or ground) and an electrical permit (for wiring from panels to inverter to panel). Most solar installers handle the entire permitting process as part of their service.
Roof Access Requirements
Fire code requires 3-foot access pathways on the roof for firefighter access. Panels cannot cover the entire roof — specific setbacks from ridges, valleys, and edges are required. Your installer will design the layout to comply.
Utility Interconnection
Before your system can be energized and connected to the grid, you need an interconnection agreement with your local utility. This is separate from the city permit. Your installer typically handles this, but it can add 2-4 weeks to the timeline.
Incentives (Read This Carefully — They Change Often)
Solar incentives shift frequently and vary by state and utility, so don't rely on older guides. State tax credits and the federal residential Clean Energy Credit (the ITC, Section 25D) have changed eligibility windows in recent years, and some may no longer apply to new installations. Your utility may offer net-billing terms or limited rebates. Because programs change often, confirm exactly what is available the week you sign — and never let an installer's quote assume a credit that no longer exists.
Bottom Line
Yes, permits are required but your solar installer handles them. Budget 5-14 days for permit review plus 2-4 weeks for utility interconnection.
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 | $200Verified | Electrical Permit → |
| Billings | $130.00Verified | Electrical Permit → |
| Bozeman | Determined based on contractor valuation of the project, subject to Building Division approval of the valuation, applied against Table CVerified | Electric Only Permit → |
| Butte-Silver Bow | Set by the State of Montana Building Codes Program, not by Butte-Silver BowVerified | Electrical Permit → |
| Great Falls | $34.39Verified | Electrical Permit → |
| Havre | $200Verified | Residential Electrical Permit → |
| Helena | $35.00Verified | Electrical Permit → |
| Kalispell | $200.00Verified | Electrical Permit → |
| Missoula | $361.00Verified | Residential Electrical Permit → |
| Unincorporated Yellowstone County | $45Verified | Solar Panel Permit → |