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Deck / Accessory Structure Permit in Libby, Montana

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

Verified 2026-07-03 · Source

When you need this permit

  • Complete the Libby 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 (tool/storage sheds/playhouses) are exempt from a building permit; fences under 6 feet and retaining walls under 4 feet are also exempt
  • Since January 23, 2012, floodplain review by the Lincoln County Floodplain Manager applies to new building permits; a separate County floodplain permit may be required if applicable

Required documents

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Fee schedule

Building Permit Fee — valuation-based (same Appendix L table used for other building permits)City of Libby Building Permit Requirements packet, Appendix L 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 Libby Appendix L Permit Fees table

Review timeline

Plan review
Not published — contact the department

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

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 Libby inspection guide — scheduling & re-inspection fees →

Tips

  • Tool/storage sheds and playhouses under 120 square feet do NOT require a City of Libby building permit — this 120-square-foot threshold is smaller than some other Montana cities' 200-square-foot shed exemption, so verify square footage carefully before assuming an exemption applies.
  • Fences under 6 feet and retaining walls under 4 feet are also exempt from a building permit in Libby.

Frequently asked questions

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

In Libby, the published Building Permit Fee — valuation-based (same Appendix L table used for other building permits) is: $24 minimum ($1-$500 valuation), scaling per the City of Libby Appendix L Permit Fees table. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Libby does not publish a plan-review timeline for this permit. Contact City of Libby Building Department — Building Inspector Walter Snyder; 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 Libby city limits are issued directly by the Montana Department of Labor & Industry Building Codes Bureau, not the City. at (406) 293-2731 for current turnaround.

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

Libby requires 3 inspection(s) for a deck / accessory structure permit, in order: Footing/Foundation, Frame, Final. Schedule each through City of Libby Building Department — Building Inspector Walter Snyder; 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 Libby city limits are issued directly by the Montana Department of Labor & Industry Building Codes Bureau, not the City. ((406) 293-2731).

Apply through City of Libby Building Department — Building Inspector Walter Snyder; 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 Libby city limits are issued directly by the Montana Department of Labor & Industry Building Codes Bureau, not the City. at 952 E. Spruce St., PO Box 1428, Libby, MT 59923. Phone: (406) 293-2731, email: building.inspector@cityoflibby.com. Office hours: City Hall, 952 E. Spruce St., Libby, MT 59923; general line (406) 293-2731, fax (406) 293-4090. Building Inspector Walter Snyder direct line (406) 291-9629, email building.inspector@cityoflibby.com.. Official information: https://cityoflibby.com/departments-services/building-inspector/.

Libby, 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).; Libby is a Montana DLI-certified jurisdiction for Building (B), RESIDENTIAL ONLY, plus Swimming Pool (SP), within city limits; certified official on file with DLI: Walter Snyder, (406) 293-2731. Verified directly against the DLI Building Codes Bureau's 'Montana Certified Local Government Program' roster PDF, updated 04/22/2026 (fetched and read directly, not taken on secondhand summary): 'Libby | B (residential only), SP | Walter Snyder | 293-2731 | City Limits'. This means COMMERCIAL building permits within Libby 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 Libby's own Building Inspector Department page and Building Permit Requirements packet list the codes referenced for construction in Libby as: the 2021 International Residential Code (IRC), 2021 International Energy Conservation Code (IECC), 2021 International Existing Building Code (IEBC), and 2021 International Swimming Pool and Spa Code (ISPSC) — consistent with a small residential-and-pool-only-certified jurisdiction enforcing the state-adopted editions rather than authoring independently amended code text. Source: City of Libby Building Inspector page, https://cityoflibby.com/departments-services/building-inspector/; 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; The City's own downloadable Building Permit Requirements and Application packet (cityoflibby.com) still references an older permit-fee appendix table sourced from the 2006 International Residential Code (Appendix L) and an inspection-record card citing the 2009 IBC/IRC — the City's packet has not been fully refreshed to reference 2021-edition appendix/section numbers 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.. Local amendments apply — see the Libby 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 Libby building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.

Other permits in Libby

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 PV Permit (Alternative Energy)EV Charger / Electric Vehicle Charging Station PermitSign PermitFire Sprinkler / Fire Alarm System PermitChange of Use / Certificate of Occupancy

Deck / Accessory Structure Permit in other cities

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