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Solar Photovoltaic (PV) / Alternative Energy Permit in Troy, Montana

Required for installation of rooftop or ground-mount solar photovoltaic systems within Troy city limits. The structural/mounting portion (if a building permit is triggered) is issued by the City of Troy Building Department, which is DLI-certified for residential building only. The electrical interconnection portion — the permit that actually applies to nearly all grid-tied residential solar in Troy — is issued directly by the Montana DLI Building Codes Bureau in Helena, not the City, since Troy holds no Electrical certification, under the statewide 'Renewable energy system' fee category (ARM 24.301.461).

Verified 2026-07-20 · Source

When you need this permit

  • Electrical interconnection work requires a state-issued permit from the Montana DLI Building Codes Bureau, filed by a licensed electrical contractor selecting 'solar' on the standard Application for Residential (or Commercial) Electrical Permit (BCP-1), or by the homeowner for owner-performed single-family work with a grid-tied connection still requiring a licensed contractor Contractor
  • If the installation triggers a structural/mounting building permit (e.g., roof-load or ground-mount foundation work), that portion is submitted to the City of Troy Building Department using the standard City Building Permit Application, valued per the City's own valuation-based fee table
  • Commercial solar work requires a licensed electrical contractor, who applies for a permit for the whole project and selects 'solar'; fees are based on the total value of the electrical work, including the solar equipment
  • Per Montana DEQ's statewide solar permitting report, Montana solar permit fees generally range from $40 to over $400 and turnaround from under a day to about four weeks, varying significantly by which of the 46+ local permitting jurisdictions (or the state, for non-certified towns like Troy) is involved

Required documents

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This checker covers one permit. A full project usually triggers several — our paid checklist will assemble all of them, from $29

Fee schedule

Renewable energy system: net metering or off-grid electrical generating system (photovoltaic (PV) system, wind generator, hydro turbine, etc.) — commercial or residentialMont. Admin. r. 24.301.461, Schedule of Electrical Inspection Fees — the statewide fee schedule applied by the DLI Building Codes Bureau in all non-electrically-certified Montana jurisdictions, including Troy, per this database's electrical-permit-state.json record for Troy
$65
City Building Permit Fee (valuation-based, structural/mounting portion, if triggered)City of Troy Building Permit Requirements packet (dated February 7, 2023), Permit Fees table — same table used for other residential building work
$24 minimum ($1-$500 valuation), scaling per the City of Troy Building Permit Requirements packet fee table

Review timeline

Plan review
Not published — contact the department

How long did your Solar Photovoltaic (PV) / Alternative Energy Permit permit actually take in Troy?

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

Inspection process

  1. 1

    Rough Electrical (State DLI)

    Conduit runs, wire sizing, and disconnect placement verified by a DLI-assigned inspector under the state electrical permit

  2. 2

    Final — Structural/Mounting (City, if a building permit was required)

    Racking attachment and roof-penetration or foundation compliance verified by the City Building Inspector

See the full Troy inspection guide — scheduling & re-inspection fees →

Tips

  • Nearly all grid-tied residential solar in Troy runs through the STATE electrical permit (DLI Building Codes Bureau, Helena), not the City — Troy holds no Electrical certification, so the $65 statewide 'Renewable energy system' fee (ARM 24.301.461) is the fee most homeowners will actually pay, separate from any City building-permit fee for structural work.
  • Only involve the City of Troy Building Department if the installation includes a structural/mounting scope (e.g., a ground-mount foundation or added roof structure) — Troy's own building certification is residential-only, and a simple roof-mount PV array may not trigger a separate City building permit at all if it doesn't otherwise require one under Troy's adopted residential code.

Frequently asked questions

Troy requires a solar photovoltaic (pv) / alternative energy permit for: Electrical interconnection work requires a state-issued permit from the Montana DLI Building Codes Bureau, filed by a licensed electrical contractor selecting 'solar' on the standard Application for Residential (or Commercial) Electrical Permit (BCP-1), or by the homeowner for owner-performed single-family work with a grid-tied connection still requiring a licensed contractor; If the installation triggers a structural/mounting building permit (e.g., roof-load or ground-mount foundation work), that portion is submitted to the City of Troy Building Department using the standard City Building Permit Application, valued per the City's own valuation-based fee table; Commercial solar work requires a licensed electrical contractor, who applies for a permit for the whole project and selects 'solar'; fees are based on the total value of the electrical work, including the solar equipment; Per Montana DEQ's statewide solar permitting report, Montana solar permit fees generally range from $40 to over $400 and turnaround from under a day to about four weeks, varying significantly by which of the 46+ local permitting jurisdictions (or the state, for non-certified towns like Troy) is involved. If your project isn't listed, confirm with City of Troy Building Department — Building Inspector David Jones; city-certified for Building (B), RESIDENTIAL ONLY, plus Swimming Pool (SP) permits. Commercial building permits, and Electrical, Plumbing, and Mechanical permits for ALL project types (residential and commercial), within Troy city limits are issued directly by the Montana Department of Labor & Industry Building Codes Bureau, not the City. at (406) 295-4151 before starting work.

In Troy, the published Renewable energy system: net metering or off-grid electrical generating system (photovoltaic (PV) system, wind generator, hydro turbine, etc.) — commercial or residential is: $65. Additional published fees: City Building Permit Fee (valuation-based, structural/mounting portion, if triggered) — $24 minimum ($1-$500 valuation), scaling per the City of Troy Building Permit Requirements packet fee table. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Troy does not publish a plan-review timeline for this permit. Contact City of Troy Building Department — Building Inspector David Jones; city-certified for Building (B), RESIDENTIAL ONLY, plus Swimming Pool (SP) permits. Commercial building permits, and Electrical, Plumbing, and Mechanical permits for ALL project types (residential and commercial), within Troy city limits are issued directly by the Montana Department of Labor & Industry Building Codes Bureau, not the City. at (406) 295-4151 for current turnaround.

You'll need: Application for Residential or Commercial Electrical Permit (BCP-1, state). Depending on your project, Troy may also ask for: City of Troy Building Permit Application. See the required-documents checklist on this page for details on each.

Troy requires 2 inspection(s) for a solar photovoltaic (pv) / alternative energy permit, in order: Rough Electrical (State DLI), Final — Structural/Mounting (City, if a building permit was required). Schedule each through City of Troy Building Department — Building Inspector David Jones; city-certified for Building (B), RESIDENTIAL ONLY, plus Swimming Pool (SP) permits. Commercial building permits, and Electrical, Plumbing, and Mechanical permits for ALL project types (residential and commercial), within Troy city limits are issued directly by the Montana Department of Labor & Industry Building Codes Bureau, not the City. ((406) 295-4151).

Apply through City of Troy Building Department — Building Inspector David Jones; city-certified for Building (B), RESIDENTIAL ONLY, plus Swimming Pool (SP) permits. Commercial building permits, and Electrical, Plumbing, and Mechanical permits for ALL project types (residential and commercial), within Troy city limits are issued directly by the Montana Department of Labor & Industry Building Codes Bureau, not the City. at 301 E. Kootenai Avenue, Troy, MT 59935. Phone: (406) 295-4151, email: citytroy@troymt.net. Office hours: City Hall, 301 E. Kootenai Ave., Troy, MT 59935; Monday-Friday, 8:00 am to 5:00 pm (closed weekends/holidays); general line (406) 295-4151, email citytroy@troymt.net. Building Inspector David Jones direct line (406) 295-9851, email building.inspector@troymt.net.. Official information: https://cityoftroymontana.com/troy-city-council/city-hall/.

Troy, Montana has adopted: Montana has a mandatory statewide building code administered by the Montana Department of Labor & Industry (DLI) Building Codes Bureau, amended by the Administrative Rules of Montana (ARM) Title 24, Chapter 301. Cities, counties, and towns may become 'certified' to locally administer permitting and inspection for all or part of the code; non-certified trades and non-certified project scopes in a partially-certified jurisdiction fall under direct state administration by the DLI Building Codes Bureau. Source: Montana DLI Building Codes Bureau, Certified City, County and Town Programs (bsd.dli.mt.gov/building-codes-permits).; Troy is a Montana DLI-certified jurisdiction for Building (B), RESIDENTIAL ONLY, plus Swimming Pool (SP), within city limits; certified official on file with DLI: David Jones, (406) 295-9851. Verified directly against the DLI Building Codes Bureau's 'Montana Certified Local Government Program' roster PDF (fetched via browser-header curl and read directly with pdftotext, not taken on secondhand summary): 'Troy | B (residential only), SP | David Jones | 295-9851 | City Limits'. This means COMMERCIAL building permits within Troy city limits, and Electrical/Plumbing/Mechanical permits for ALL project types (residential and commercial), are issued DIRECTLY by the Montana DLI Building Codes Bureau, not the City. Source: https://bsd.dli.mt.gov/_docs/building-codes-permits/certified-city.pdf; The City of Troy's own 'Building Permit Requirements' packet (dated February 7, 2023, filename Building Permit Application 2022.docx/pdf) references the '2009 IBC-IRC' on its Inspection Record card ('REMEMBER 2009 IBC-IRC required the permit holder to notify the building official when work is ready for inspection') — the City's packet has not been refreshed to reference the current 2021-edition code, even though the statewide code in force is now the 2021 edition. This is reported as an observed inconsistency in the City's own published document, not an invented fact — directly parallel to the same inconsistency found in Libby's packet.; Per the Montana DLI Building Codes Bureau's Current Codes page (statewide effective date June 11, 2022, applicable to all certified and state-enforced jurisdictions alike): 2021 IBC, 2021 IRC, 2021 IEBC, 2021 IMC, 2021 IFGC, 2021 IECC, 2021 ISPSC, 2021 UPC, 2020 NEC, 2017 ICC A117.1 Accessibility. Source: bsd.dli.mt.gov/building-codes-permits/current-codes; Troy's own Building Permit Requirements packet does not separately name IECC, IEBC, or ISPSC edition years the way Libby's City page does — the City's packet references only the general 'City, State, and National regulations' framing and the 2009 IBC-IRC inspection-card citation noted above. No additional code-edition citations were found on the City's own materials beyond what is reported here; omitted rather than inferred.. Local amendments apply — see the Troy overview page for the full list.

For the electrical interconnection portion, the State of Montana DLI Building Codes Bureau issues the permit directly, since Troy holds no Electrical certification — filed on the statewide BCP-1 form under the 'Renewable energy system' fee category ($65, per ARM 24.301.461). A separate City of Troy building permit only applies if the installation includes structural/mounting work that triggers the City's residential building-permit scope.