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Accessory Structure / Deck Permit in Glasgow, Montana

Required for decks over 2 feet off the surrounding ground and for detached accessory buildings/sheds larger than 120 square feet (10'x12') within Glasgow city limits. Uses the same combined Application for Building Permit as new construction.

Verified 2026-07-03 · Source

When you need this permit

  • Building permit required for: new construction of detached or attached garages/carports; decks over 2 feet off the surrounding ground; accessory buildings or sheds in excess of 120 square feet (10'x12')
  • NOT required for detached accessory buildings/sheds that are 120 square feet or smaller
  • Garage size is capped by lot size: under 7,000 sq ft lot allows up to 1,000 sq ft garage; 7,000-10,000 sq ft lot allows up to 1,200 sq ft; over 10,000 sq ft (contiguous if more than one lot) allows up to 1,600 sq ft maximum residential garage
  • A detached garage closer than 10 feet to a residential or commercial building is treated as 'attached' and requires a firewall facing the building: no windows, solid wood or steel door with no window lights, interior wall covered with 5/8-inch sheetrock
  • Setback/offset requirements measured from the wall to the property line apply in every zoning district and are non-negotiable; where access is from an alley, the setback from the structure to the edge of the alley must be 20 feet
  • Ordinance No. 966 property-pin requirement applies: pins must be established and witnessed by the Building Inspector before permit issuance if the project modifies the structure's footprint
  • Plot plan and construction plan/elevations required per the standard Building Permit Application Instructions (minimum 2 complete sets of plans for garages/remodel-scale projects)

Required documents

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Fee schedule

Building permit fee (accessory structure/deck)Same unresolved fee-schedule gap as the general Residential Building Permit — no fixed published fee table was locatable for Glasgow (City Building Permit Packet, Public Works page, and Municode all checked). Left null per the zero-tolerance policy; contact the Building Codes Department at (406) 228-2476 ext. 8 for a current quote.
Not published — contact the department

Review timeline

Plan reviewGlasgow’s published plan-review target
4–7 business days

How long did your Accessory Structure / Deck Permit permit actually take in Glasgow?

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

Inspection process

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

    Tips

    • Sheds and detached accessory buildings 120 sq ft (10'x12') or smaller need NO building permit at all in Glasgow — this is one of the few outright exemptions the City publishes.
    • If your detached garage will sit closer than 10 feet from your house or another building, budget for firewall construction (solid door, no window lights, 5/8-inch sheetrock) since it will be treated as 'attached' under the code.
    • Garage size maximums scale with lot size — check your lot square footage against the 1,000/1,200/1,600 sq ft tiers before finalizing garage plans.

    Frequently asked questions

    Yes, if the deck is more than 2 feet off the surrounding ground. Decks 2 feet or less off grade are not explicitly listed as requiring a permit under the City's Building Permit Packet criteria.

    Glasgow's published plan-review target for an accessory structure / deck permit is 4–7 business days.

    You'll need: Application for Building Permit; Plot Plan and Construction Plan. See the required-documents checklist on this page for details on each.

    Apply through City of Glasgow Public Works Department / Building Codes Department — Rod Dees, Code Compliance Officer; city-certified for Building (B) permits only. Electrical, Plumbing, and Mechanical permits within Glasgow city limits are issued directly by the Montana Department of Labor & Industry Building Codes Bureau, not the City. at 319 3rd Street South, Glasgow, MT 59230. Phone: (406) 228-2476, email: codecompliance@cityofglasgowmt.com. Office hours: City Hall: Monday-Friday, 8:00 AM-12:00 PM and 1:00 PM-5:00 PM, closed federal holidays. Code Compliance Officer Rod Dees: (406) 228-2476 ext. 8, cell (406) 263-3386. Public Works Department can also be reached at (406) 228-2476 ext. 4 for pre-submittal project discussions.. Official information: https://www.cityofglasgowmt.com/public-works-department.

    Glasgow, 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 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 list (bsd.dli.mt.gov/building-codes-permits).; Glasgow is a Montana DLI-certified jurisdiction for Building (B) ONLY within city limits; certified building official on file with DLI: Rod Dees, (406) 228-2476. Source: Montana DLI Building Codes Bureau, 'Montana Certified Local Government Program' roster, updated 04/22/2026, https://bsd.dli.mt.gov/_docs/building-codes-permits/certified-city.pdf — verified directly against the PDF: 'Glasgow | B | Rod Dees | 228-2476 | City Limits'.; Per the City of Glasgow's own 'General Information for Building Permit Applications' packet (Public Information Sheet GIPBA No. 4, dated 11/17/2021): all building designs and plans must adhere to the 2018 International Residential Code, 2018 International Building Code, 2018 International Mechanical Code, 2018 International Existing Building Code, 2018 International Fuel Gas Code, 2018 International Swimming Pool and Spa Code, 2012 International Energy Code, and the 2018 Uniform Plumbing Code, plus applicable local zoning codes. Source: City of Glasgow Building Permit Packet, cityofglasgowmt.com/_files/ugd/2ff7f3_a263251865d842a9b7db016c72ebf448.pdf; Note on code-edition discrepancy: the City's own packet (last dated 2021) cites 2018-edition I-codes and the 2012 IECC, while the Montana DLI Building Codes Bureau's statewide 'Current Codes' page lists the newer 2021-edition codes (2021 IBC, IRC, IMC, IFGC, ISPSC, IEBC, UPC; 2021 IECC; 2020 NEC) as effective statewide since June 11, 2022. Because Glasgow is a certified local Building program, ARM 24.301.202 requires its adopted code to be one 'adopted by the Building Codes Bureau' — the City's own document may not have been updated to reflect the 2021-cycle codes. This discrepancy is reported as found rather than resolved by assumption; applicants should confirm current code edition in effect with the City Building Codes Department, (406) 228-2476 ext. 8. Source: bsd.dli.mt.gov/building-codes-permits/current-codes vs. City of Glasgow Building Permit Packet.; The City of Glasgow's own Building Permit Packet contains an internal inconsistency regarding Mechanical permits: one bullet in the 'General Information' page states 'The City of Glasgow also issues plumbing/mechanical permits,' while a later 'NOTICE' section in the same packet states plainly: 'The City of Glasgow covers Building Permits and Mechanical Permits; the State of Montana issues plumbing and electrical plans for work in the city.' The DLI's own certified-jurisdictions roster (updated 04/22/2026) lists Glasgow's certification as 'B' ONLY, with no 'M' code shown (contrast with e.g. Havre or Choteau, also 'B' only, or Belgrade/Billings which show explicit 'M' certification). Given the DLI roster is the authoritative statewide certification record, this KB treats Mechanical permits in Glasgow as STATE-ISSUED (routed to the DLI Building Codes Bureau) consistent with the official 'B'-only certification, while flagging the City's own document's contrary claim as an unresolved discrepancy applicants should verify directly with (406) 228-2476 ext. 8 before assuming which office issues a mechanical permit.. Local amendments apply — see the Glasgow overview page for the full list.

    Sources & verification

    Verified against official sources. Last reviewed 2026-07-03.

    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 Glasgow building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.

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    Accessory Structure / Deck Permit in other cities

    East Helena, MontanaRonan, Montana

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