Solar Panel Permit in Unincorporated Yellowstone County, Montana
VerifiedSolar installations in unincorporated Yellowstone County are permitted through the Montana Building Codes Bureau's electrical/alternative-energy permitting track — there is no separate 'solar permit'; instead, the permit type depends on who performs the installation and whether it is grid-tied. The Bureau publishes a specific solar permitting decision flow for new residential construction.
Verified 2026-07-02 · Source
When you need this permit
- If the installer is a licensed electrical contractor: the contractor applies for a Residential (or Commercial) Electrical Permit for the dwelling/amperage and selects 'solar' on the application
- If the installer is not an electrician: the solar installer submits an Application for Alternative Energy Permit and provides solar system information
- If grid-tied, a Montana-licensed electrical contractor is required to perform the final connection to the utility grid, even if a homeowner or non-electrician installer did the rest
- A homeowner may self-install using a Homeowner Electrical Permit (option H, single family interior/exterior wire) and provide solar information, but a licensed electrical contractor must still make the grid-tie connection if applicable
- Commercial solar always requires a licensed electrical contractor; fee is based on total value of the electrical work including solar
Required documents
- Optional
Application for Alternative Energy Permit
Used when the solar installer is not a licensed electrical contractor; filed with the Building Codes Bureau, PO Box 200517, Helena, MT 59620-0517, or online. Requires answering: alternative energy type (solar/wind/hydro), solar system type (PV string, generator, or microinverter/AC module), whether the system produces 90+ volts, and whether it is grid-tied.
- Optional
Application for Residential Electrical Permit or Homeowner Electrical Permit
Used instead of the Alternative Energy Permit when a licensed electrical contractor or the homeowner personally performs the entire installation
Fee schedule
| Fee type | Amount | Notes |
|---|---|---|
| Residential Change of Service (solar connection) | $45 | Montana Building Codes Bureau, Application for Alternative Energy Permit (ARM 24.301.431, Rev. 11/25), option F |
| Commercial solar/electrical project $0–$1,000 | $45 for the first $500 + 6% of the balance | Same source, option G fee chart |
| Commercial solar/electrical project $1,001–$10,000 | $75 for the first $1,000 + 2% of the balance | Same source |
| Commercial solar/electrical project $10,001–$50,000 | $255 for the first $10,000 + 0.5% of the balance | Same source |
| Commercial solar/electrical project $50,001 or more | $455 for the first $50,000 + 0.3% of the balance | Same source |
Review timeline
~1–5 business days
Typical estimate — confirm current times with the Unincorporated Yellowstone County building department
Inspection process
- 1
Rough Electrical / Final
State Electrical Inspector verifies wiring, disconnects, and grid-tie connection per NEC; 48 hours notice required before covering work
Tips
- There is no dedicated 'solar permit' fee category in Montana's state system — solar is permitted through the electrical permit (if a contractor does the whole job) or the Alternative Energy Permit (if a non-electrician installer does the panel work, with a licensed contractor doing only the grid-tie connection).
- A homeowner can self-install solar on their own home using a Homeowner Electrical Permit, but if the system is grid-tied, a licensed Montana electrical contractor is still legally required to perform the final connection to the power source.
- Wind turbine installations additionally require a building permit for the raised platform/foundation, calculated on construction cost, separate from the electrical/wiring permit for 90+ volt raceways.
Frequently asked questions
- Do I need a permit for solar panels in unincorporated Yellowstone County?
- Yes. Solar installations require either a Residential/Commercial Electrical Permit (if a licensed electrical contractor performs the work) or an Alternative Energy Permit (if a non-electrician installer does the panel work). If grid-tied, a licensed Montana electrical contractor must always perform the final grid connection. The residential change-of-service fee for solar is $45; commercial fees scale with project cost.
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 — Alternative Energy Information (solar permitting decision flow)
- Montana Building Codes Bureau — Application for Alternative Energy Permit (ARM 24.301.431, Rev. 11/25) — verbatim fee schedule
- Montana Building Codes Bureau — Application for Homeowner Electrical Permit (ARM 24.301.431, Rev. 11/25)
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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