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Deck / Accessory Structure Permit in Troy, Montana

Required for decks, detached garages, and storage sheds 120 square feet or larger within Troy city limits, using the City's own City of Troy Building Permit Application under its residential Building (B) certification. Play houses/storage sheds under 120 square feet are exempt.

Verified 2026-07-04 · Source

When you need this permit

  • Complete the City of Troy Building Permit Application with the appropriate Type of Project checkbox (Residential / Addition) and a description of the deck, garage, or accessory structure
  • Submit a site plan showing the structure's location, dimensions, and setbacks from property lines, plus a section view/detail sufficient to show size and type of materials and assembly method
  • Structures under 120 square feet in floor area (play houses/storage sheds) are exempt from a building permit; fences under 6 feet and retaining walls under 4 feet are also exempt

Required documents

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Fee schedule

Building Permit Fee — valuation-based (same table used for other building permits)City of Troy Building Permit Requirements packet, Permit Fees table; no separate deck-specific or accessory-structure-specific fee line was found published by the City distinct from the general valuation-based building permit fee table
$24 minimum ($1-$500 valuation), scaling per the City of Troy Permit Fees table

Review timeline

Plan review
Not published — contact the department

How long did your Deck / Accessory Structure 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

    Footing/Foundation

    Required before concrete pour for deck posts or garage foundations, consistent with the City's general Foundation Inspection practice.

  2. 2

    Frame

    Structural framing and connections to the existing structure verified, consistent with the City's general Frame Inspection practice.

  3. 3

    Final

    Completed structure verified against approved plans; a Certificate of Occupancy is required before use where applicable.

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

Tips

  • Play houses and storage sheds under 120 square feet do NOT require a City of Troy building permit — this matches Libby's identical 120-square-foot shed exemption.
  • Fences under 6 feet, retaining walls under 4 feet, and walks/slabs/flat work under 30 inches above grade are also exempt from a building permit in Troy.

Frequently asked questions

A deck or accessory structure (garage, larger shed) requires a City of Troy Building Permit Application. Play houses and storage sheds under 120 square feet are exempt from a building permit per the City's Building Permit Requirements packet.

In Troy, the published Building Permit Fee — valuation-based (same table used for other building permits) is: $24 minimum ($1-$500 valuation), scaling per the City of Troy Permit Fees 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: City of Troy Building Permit Application; Site Plan and Construction Detail. See the required-documents checklist on this page for details on each.

Troy requires 3 inspection(s) for a deck / accessory structure permit, in order: Footing/Foundation, Frame, Final. 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.

Sources & verification

Verified against official sources. Last reviewed 2026-07-04.

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.

Other permits in Troy

Residential Building Permit (New Construction / Addition / Alteration / Repair)Commercial Building Permit (State-Issued)Swimming Pool PermitElectrical Permit (State-Issued)Plumbing Permit (State-Issued, incl. Water Heater)Mechanical / HVAC Permit (State-Issued)Demolition / Building Move PermitSolar Photovoltaic (PV) / Alternative Energy PermitElectric Vehicle (EV) Charger Permit (State-Issued)Commercial / Business Sign PermitFire Sprinkler & Fire Alarm Permit (State-Issued, via Building Permit 'Fire Suppression' Type of Work)Change of Use / Change of Occupancy Permit (Commercial — State-Issued) and Certificate of Occupancy

Deck / Accessory Structure Permit in other cities

Cut Bank, MontanaLewistown, MontanaLibby, MontanaRed Lodge, Montana

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