Solar Photovoltaic (PV) / Alternative Energy Permit — Troy, Montana · Requirements sheet
Verified 2026-07-20 · Source: https://bsd.dli.mt.gov/building-codes-permits/alternative-energy-information/
PermitBase is an independent reference and is not affiliated with any government agency. Requirements change and vary by project — confirm current details with the building department before you submit.
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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Fee schedule
Review timeline
Inspection process
- 1
Rough Electrical (State DLI)
Conduit runs, wire sizing, and disconnect placement verified by a DLI-assigned inspector under the state electrical permit
- 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
Sources & verification
Verified against official sources. Last reviewed 2026-07-20.
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 Troy building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.
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