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Solar Panel Permit in Unincorporated Yellowstone County, Montana

Solar 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

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Fee schedule

Residential Change of Service (solar connection)Montana Building Codes Bureau, Application for Alternative Energy Permit (ARM 24.301.431, Rev. 11/25), option F
$45
Commercial solar/electrical project $0–$1,000Same source, option G fee chart
$45 for the first $500 + 6% of the balance
Commercial solar/electrical project $1,001–$10,000Same source
$75 for the first $1,000 + 2% of the balance
Commercial solar/electrical project $10,001–$50,000Same source
$255 for the first $10,000 + 0.5% of the balance
Commercial solar/electrical project $50,001 or moreSame source
$455 for the first $50,000 + 0.3% of the balance

Review timeline

Plan reviewTypical estimate — confirm current times with the Unincorporated Yellowstone County building department
~1–5 business days

How long did your Solar Panel Permit permit actually take in Unincorporated Yellowstone County?

Anonymous — one question, no email. Answers are combined and only shown once at least 5 people have reported.

Inspection process

  1. 1

    Rough Electrical / Final

    State Electrical Inspector verifies wiring, disconnects, and grid-tie connection per NEC; 48 hours notice required before covering work

See the full Unincorporated Yellowstone County inspection guide — scheduling & re-inspection fees →

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). Contractor
  • 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

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.

In Unincorporated Yellowstone County, the published Residential Change of Service (solar connection) is: $45. Additional published fees: Commercial solar/electrical project $0–$1,000 — $45 for the first $500 + 6% of the balance; Commercial solar/electrical project $1,001–$10,000 — $75 for the first $1,000 + 2% of the balance; Commercial solar/electrical project $10,001–$50,000 — $255 for the first $10,000 + 0.5% of the balance; Commercial solar/electrical project $50,001 or more — $455 for the first $50,000 + 0.3% of the balance. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Plan review for a solar panel permit in Unincorporated Yellowstone County typically runs 1–5 business days. This is an estimate, not a published figure — confirm current review times with Montana Department of Labor & Industry — Building Codes Bureau (Business Standards Division, Building and Commercial Measurements Bureau) at (406) 841-2056.

Depending on your project, Unincorporated Yellowstone County may also ask for: Application for Alternative Energy Permit; Application for Residential Electrical Permit or Homeowner Electrical Permit. See the required-documents checklist on this page for details on each.

Unincorporated Yellowstone County requires 1 inspection(s) for a solar panel permit, in order: Rough Electrical / Final. Schedule each through Montana Department of Labor & Industry — Building Codes Bureau (Business Standards Division, Building and Commercial Measurements Bureau) ((406) 841-2056).

Apply through Montana Department of Labor & Industry — Building Codes Bureau (Business Standards Division, Building and Commercial Measurements Bureau) at 301 South Park Ave, Floors 4-5, Helena, MT 59620 (mailing: Building Codes Bureau, PO Box 200517, Helena, MT 59620-0517). Phone: (406) 841-2056, email: buildingcodes@mt.gov. Office hours: Mon–Fri, state business hours; online permitting available 24/7 via https://aca-prod.accela.com/bcb/. Official information: https://bsd.dli.mt.gov/building-codes-permits/.

Unincorporated Yellowstone County, Montana has adopted: 2021 International Building Code (IBC) — adopted statewide by ARM Title 24, Chapter 301; effective June 11, 2022; 2021 International Residential Code (IRC) — ARM Title 24, Chapter 301; effective June 11, 2022; 2021 International Existing Building Code (IEBC) — ARM Title 24, Chapter 301; effective June 11, 2022; ICC A117.1-2017 (Accessibility) — ARM Title 24, Chapter 301; effective June 11, 2022; 2021 Uniform Plumbing Code (UPC) — ARM Title 24, Chapter 301; effective June 11, 2022 (fixture table at ARM 24.301.351); 2021 International Mechanical Code (IMC) — ARM Title 24, Chapter 301; effective June 11, 2022; 2021 International Fuel Gas Code (IFGC) — ARM Title 24, Chapter 301; effective June 11, 2022; 2020 National Electrical Code (NEC) — ARM Title 24, Chapter 301; effective June 11, 2022 (NEC Technical Advisory NEC_TIA-23-3_210.8 issued August 12, 2022); 2021 International Energy Conservation Code (IECC) — ARM Title 24, Chapter 301; effective June 11, 2022; 2021 International Swimming Pool and Spa Code (ISPSC) — ARM Title 24, Chapter 301; effective June 11, 2022; 2021 Wildland Urban Interface Code (WUIC) — ARM Title 24, Chapter 301; effective June 11, 2022; NOTE: All codes listed are statewide codes administered directly by the Montana Building Codes Bureau for areas (like unincorporated Yellowstone County) that are NOT within a certified local-government building code jurisdiction..

Sources & verification

Verified against official sources. Last reviewed 2026-07-02.

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.

Other permits in Unincorporated Yellowstone County

Residential Building PermitElectrical PermitPlumbing PermitMechanical / HVAC PermitRoofing Permit (Reroof)Accessory Dwelling Unit (ADU)Water Heater PermitElectric Vehicle (EV) Charging Station / EVSE Permit (State Electrical Permit)Sign PermitFire Sprinkler / Fire Alarm PermitChange of Use / Zoning Compliance Permit

Solar Panel Permit in other cities

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