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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RequiredApplication for Building PermitSame City of Glasgow form used for all new construction/alteration work, with 'New' or 'Addition' indicated for the accessory structure or deck
RequiredPlot Plan and Construction PlanSite plan showing setbacks and structure location; construction/floor plan and typical cross-section for the deck or accessory structure

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Fee schedule

Building permit fee (accessory structure/deck)Same fee-schedule gap as the general Residential Building Permit — Glasgow publishes no fixed fee table (City Building Permit Packet, Public Works page, Municode). 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

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, which lists '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; The 2021 editions govern. The City's own permit packet (dated 11/17/2021) cites 2018-edition I-codes and the 2012 IECC, while Montana DLI's statewide Current Codes page lists 2021 editions; Glasgow's own Municipal Code settles the discrepancy — Chapter 8, Article II adopts the 2021 editions by section, each 'Pursuant to MCA 50-60-301 and ARM 24.301.202'. The City packet is simply out of date relative to the City's own codified ordinance. City of Glasgow Code of Ordinances Chapter 8 (Buildings and Building Regulations), Article II (Technical Codes) (nodeId COOR_CH8BUBURE); codification current through Ordinance No. 981, adopted 2022-08-15, online content updated 2023-12-01.; 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.; International Building Code, 2021 edition — adopted at Code of Ordinances Sec. 8-23, 'as amended by ARM 24.301.131 and all accompanying appendices, amendments, and modifications adopted by the building codes bureau, state department of labor and industry', pursuant to MCA 50-60-301 and ARM 24.301.202. City of Glasgow Code of Ordinances Chapter 8 (Buildings and Building Regulations), Article II (Technical Codes) (nodeId COOR_CH8BUBURE); codification current through Ordinance No. 981, adopted 2022-08-15, online content updated 2023-12-01.; International Residential Code, 2021 edition — adopted at Code of Ordinances Sec. 8-24, as amended by ARM 24.301.154, for detached single- or two-family dwellings and townhouses not more than three stories and their accessory structures. City of Glasgow Code of Ordinances Chapter 8 (Buildings and Building Regulations), Article II (Technical Codes) (nodeId COOR_CH8BUBURE); codification current through Ordinance No. 981, adopted 2022-08-15, online content updated 2023-12-01.; International Fuel Gas Code — adopted at Code of Ordinances Sec. 8-25 'as adopted by the state in ARM 24.301.173'. NOTE: Sec. 8-25 is the one adoption section in Article II that cites NO edition year of its own; the edition is whatever ARM 24.301.173 currently carries. Stated as the section states it rather than assumed to be 2021 by analogy with Secs. 8-23, 8-24, 8-26 and 8-27. City of Glasgow Code of Ordinances Chapter 8 (Buildings and Building Regulations), Article II (Technical Codes) (nodeId COOR_CH8BUBURE); codification current through Ordinance No. 981, adopted 2022-08-15, online content updated 2023-12-01.; International Existing Building Code, 2021 edition — adopted at Code of Ordinances Sec. 8-26, as amended by ARM 24.301.171, usable 'as an alternative prescriptive method for the remodel, repair, alteration, change of occupancy, addition, and relocation of existing buildings'. City of Glasgow Code of Ordinances Chapter 8 (Buildings and Building Regulations), Article II (Technical Codes) (nodeId COOR_CH8BUBURE); codification current through Ordinance No. 981, adopted 2022-08-15, online content updated 2023-12-01.; International Energy Conservation Code, 2021 edition — adopted at Code of Ordinances Sec. 8-27, as amended by ARM 24.301.161. This supersedes the 2012 IECC cited in the City's own 2021 permit packet. City of Glasgow Code of Ordinances Chapter 8 (Buildings and Building Regulations), Article II (Technical Codes) (nodeId COOR_CH8BUBURE); codification current through Ordinance No. 981, adopted 2022-08-15, online content updated 2023-12-01.; Uniform Federal Accessibility Standards (current edition, published by the General Services Administration) — adopted by reference at Code of Ordinances Sec. 8-28(a), together with the appendices, amendments and modifications adopted by the state building codes bureau as set out in the Administrative Rules of Montana. City of Glasgow Code of Ordinances Chapter 8 (Buildings and Building Regulations), Article II (Technical Codes) (nodeId COOR_CH8BUBURE); codification current through Ordinance No. 981, adopted 2022-08-15, online content updated 2023-12-01.; Uniform Plumbing Code (current edition, published by the International Association of Plumbing and Mechanical Officials) — adopted by reference at Code of Ordinances Sec. 8-88(a), with the ARM amendments. NOTE this is a UPC jurisdiction for plumbing, not an IPC one; plumbing permits themselves are issued by the Montana DLI rather than the City, per localAmendments. City of Glasgow Code of Ordinances Chapter 8 (Buildings and Building Regulations), Article II (Technical Codes) (nodeId COOR_CH8BUBURE); codification current through Ordinance No. 981, adopted 2022-08-15, online content updated 2023-12-01.; City of Glasgow Code of Ordinances Chapter 8 (Buildings and Building Regulations), Article II (Technical Codes) adopts seven codes by section.. Local amendments apply — see the Glasgow overview page for the full list.

Sources & verification

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

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. — official building department

Checklists & handouts

City of Glasgow Building Permit Packet (PDF)

Department & other records

City of Glasgow — Public Works Department

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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