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Residential Building Permit (New Construction / Addition / Alteration / Repair) in Troy, Montana

Required for new single-family home construction, additions, alterations, and repairs within Troy city limits. Issued by the City of Troy under its DLI-certified local Building (B), RESIDENTIAL ONLY, program, using the City's own City of Troy Building Permit Application, reviewed by Building Inspector David Jones.

Verified 2026-07-04 · Source

When you need this permit

  • Complete the City of Troy Building Permit Application: property location, owner/contractor/designer/electrician/plumber contact information, type of project (Residential, New/Addition/Alteration/Repair/Move/Demolition), description of the nature of the project, and estimated total cost (labor and materials)
  • Submit one set of drawings/plans and specifications defining the scope, intent, and method of construction, typically including: (A) a site plan showing property lines, location of structures, existing/proposed utilities, parking areas, and adjacent streets/alleys; (B) floor plans showing use and relationship of spaces, sizes, doorways, windows, fixtures, stairways, and handicapped-accessible features if needed; (C) a section view through the building detailing size/type of materials and assembly method; (D) additional information may be required for commercial and multi-family structures or unusual/hazardous structures
  • Construction may not begin until fees are paid and the permit is issued; separate electrical, plumbing, and mechanical permits issued by the State of Montana are required
  • A Certificate of Occupancy must be issued before the building can be used

Required documents

Check off what you have — your progress is saved on this device.

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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

Total Valuation $1 to $500City of Troy Building Permit Requirements packet (dated February 7, 2023), Permit Fees table
$24
Total Valuation $501 to $2,000City of Troy Building Permit Requirements packet, Permit Fees table
$24 for the first $500, plus $3 for each additional $100 or fraction thereof, to and including $2,000
Total Valuation $2,001 to $40,000City of Troy Building Permit Requirements packet, Permit Fees table
$69 for the first $2,000, plus $11 for each additional $1,000 or fraction thereof, to and including $40,000
Total Valuation $40,001 to $100,000City of Troy Building Permit Requirements packet, Permit Fees table
$487 for the first $40,000, plus $9 for each additional $1,000 or fraction thereof, to and including $100,000
Total Valuation $100,001 to $500,000City of Troy Building Permit Requirements packet, Permit Fees table
$1,027 for the first $100,000, plus $7 for each additional $1,000 or fraction thereof, to and including $500,000
Total Valuation $500,001 to $1,000,000City of Troy Building Permit Requirements packet, Permit Fees table
$3,827 for the first $500,000, plus $5 for each additional $1,000 or fraction thereof, to and including $1,000,000
Total Valuation $1,000,000 to $5,000,000City of Troy Building Permit Requirements packet, Permit Fees table — this tier is not present in Libby's published packet but IS printed on Troy's own fee table
$6,327 for the first $1,000,000, plus $3 for each additional $1,000 or fraction thereof, to and including $5,000,000
Total Valuation $5,000,001 and overCity of Troy Building Permit Requirements packet, Permit Fees table
$18,327 for the first $5,000,000, plus $1 for each additional $1,000 or fraction thereof
Investigation fee for work commenced without a permitCity of Troy Building Permit Requirements packet, quoting ARM 24.301.139 (Investigation Fees Assessed for Work Commencing Without Building Permit) directly
50% of the combined plan review and building permit fee; minimum $250, maximum $1,000

Review timeline

Plan review
Not published — contact the department

How long did your Residential Building Permit (New Construction / Addition / Alteration / Repair) 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

    Foundation Inspection

    To be made after the footings are poured and any required forms for foundations are in place. Per City of Troy Inspection Record card.

  2. 2

    Concrete Slab or Underfloor Inspection

    To be made after all in-slab service equipment is in place but before any concrete is poured, or after all service equipment is installed in a crawlspace.

  3. 3

    Frame Inspection

    To be made after the roof, all framing, fire blocking, and bracing are in place; all vents, chimneys, ductwork, and piping are in place; rough-in plumbing and rough-in electrical must be approved.

  4. 4

    Energy Conservation Inspection

    To be made after all air barriers, ceiling and wall insulation, floor insulation or crawlspace insulation, HVAC, and basement insulation are installed.

  5. 5

    Gypsum Board Inspection

    To be made after all gypsum board is in place but before any plastering is applied to joints and fasteners.

  6. 6

    Final Inspection

    To be made after the building is substantially completed and ready for occupancy; a Certificate of Occupancy is required before the building can be used. Per the City's Inspection Record card, the permit holder must notify the building official when work is ready for inspection.

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

Tips

  • The City's Inspection Record card in the current public-facing packet still cites '2009 IBC-IRC' even though the statewide code now in force is the 2021 edition — call Building Inspector David Jones at (406) 295-9851 to confirm current applicable figures before finalizing a budget.
  • Separate electrical, plumbing, and mechanical permits are always required from the State of Montana DLI Building Codes Bureau (not the City) for any Troy project, since the City is not certified in those trades.
  • Fences under 6 feet, play houses/storage sheds under 120 square feet, cosmetic finish work, residential re-siding, retaining walls under 4 feet, and walks/slabs/flat work under 30 inches above grade do not require a City building permit.
  • Troy's fee table includes a $1,000,000-$5,000,000 valuation tier and a $5,000,001-and-over tier not seen printed on Libby's otherwise-identical fee schedule — confirm the exact tier structure directly if your project involves a very large valuation.

Frequently asked questions

Troy requires a residential building permit (new construction / addition / alteration / repair) for: Complete the City of Troy Building Permit Application: property location, owner/contractor/designer/electrician/plumber contact information, type of project (Residential, New/Addition/Alteration/Repair/Move/Demolition), description of the nature of the project, and estimated total cost (labor and materials); Submit one set of drawings/plans and specifications defining the scope, intent, and method of construction, typically including: (A) a site plan showing property lines, location of structures, existing/proposed utilities, parking areas, and adjacent streets/alleys; (B) floor plans showing use and relationship of spaces, sizes, doorways, windows, fixtures, stairways, and handicapped-accessible features if needed; (C) a section view through the building detailing size/type of materials and assembly method; (D) additional information may be required for commercial and multi-family structures or unusual/hazardous structures; Construction may not begin until fees are paid and the permit is issued; separate electrical, plumbing, and mechanical permits issued by the State of Montana are required; A Certificate of Occupancy must be issued before the building can be used. 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 Total Valuation $1 to $500 is: $24. Additional published fees: Total Valuation $501 to $2,000 — $24 for the first $500, plus $3 for each additional $100 or fraction thereof, to and including $2,000; Total Valuation $2,001 to $40,000 — $69 for the first $2,000, plus $11 for each additional $1,000 or fraction thereof, to and including $40,000; Total Valuation $40,001 to $100,000 — $487 for the first $40,000, plus $9 for each additional $1,000 or fraction thereof, to and including $100,000; Total Valuation $100,001 to $500,000 — $1,027 for the first $100,000, plus $7 for each additional $1,000 or fraction thereof, to and including $500,000; Total Valuation $500,001 to $1,000,000 — $3,827 for the first $500,000, plus $5 for each additional $1,000 or fraction thereof, to and including $1,000,000; Total Valuation $1,000,000 to $5,000,000 — $6,327 for the first $1,000,000, plus $3 for each additional $1,000 or fraction thereof, to and including $5,000,000; Total Valuation $5,000,001 and over — $18,327 for the first $5,000,000, plus $1 for each additional $1,000 or fraction thereof; Investigation fee for work commenced without a permit — 50% of the combined plan review and building permit fee; minimum $250, maximum $1,000. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

The City of Troy has not published a specific review-timeline day-count for its building permits. Its own Building Permit Requirements packet states only that the building official will review the application and issue the permit, without stating a turnaround time. Contact Building Inspector David Jones at (406) 295-9851 for a current estimate.

You'll need: City of Troy Building Permit Application; Site Plan / Floor Plan / Section View Drawings. See the required-documents checklist on this page for details on each.

Troy requires 6 inspection(s) for a residential building permit (new construction / addition / alteration / repair), in order: Foundation Inspection, Concrete Slab or Underfloor Inspection, Frame Inspection, Energy Conservation Inspection, Gypsum Board Inspection, Final Inspection. 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.

The City of Troy issues its own residential Building permits under a Montana DLI 'Building (B), residential only' certification, using Building Inspector David Jones. Commercial building permits, and electrical/plumbing/mechanical permits for any project, are issued directly by the Montana DLI Building Codes Bureau instead. Source: Montana DLI Building Codes Bureau Certified Local Government Program roster.