Plumbing Permit (State-Issued, incl. Water Heater) in West Yellowstone, Montana

Yes, unless the homeowner exemption applies (owner performing the work themselves on their own owner-occupied, non-rental home). Otherwise, a State Plumbing Permit is required from the Montana Building Codes Bureau — $25 for each new water heater or replacement, since West Yellowstone holds no Plumbing certification.

In West Yellowstone, the published Each plumbing fixture or trap is: $10 each. Additional published fees: Each new water heater or replacement — $25; Each connection of building water supply to water service/public utility or private well — $20; Each connection of building drain to sewer system/public or septic — $20. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

West Yellowstone does not publish a plan-review timeline for this permit. Contact Town of West Yellowstone Building Department / Public Services — Building Inspector & Deputy Superintendent Kyle Tanner (listed as 'KC Tanner' on the Town's own Public Services page). Town is a Montana DLI-certified jurisdiction for Building (B), RESIDENTIAL ONLY. Commercial building permits, and Electrical, Plumbing, and Mechanical/HVAC permits of ANY project type, within West Yellowstone town limits are issued directly by the Montana Department of Labor & Industry Building Codes Bureau, not the Town. at (406) 646-7795 (Public Services main line) / (406) 646-7609 or (406) 640-9074 (Building Inspector Kyle/KC Tanner, ktanner@westyellowstone.gov) / 602-4897 (DLI roster listing) / (406) 841-2056 (State Building Codes Bureau — electrical, plumbing, mechanical, and non-covered commercial building) for current turnaround.

You'll need: Application for Plumbing Permit. See the required-documents checklist on this page for details on each.

West Yellowstone requires 2 inspection(s) for a plumbing permit (state-issued, incl. water heater), in order: Rough-In, Final. Schedule each through Town of West Yellowstone Building Department / Public Services — Building Inspector & Deputy Superintendent Kyle Tanner (listed as 'KC Tanner' on the Town's own Public Services page). Town is a Montana DLI-certified jurisdiction for Building (B), RESIDENTIAL ONLY. Commercial building permits, and Electrical, Plumbing, and Mechanical/HVAC permits of ANY project type, within West Yellowstone town limits are issued directly by the Montana Department of Labor & Industry Building Codes Bureau, not the Town. ((406) 646-7795 (Public Services main line) / (406) 646-7609 or (406) 640-9074 (Building Inspector Kyle/KC Tanner, ktanner@westyellowstone.gov) / 602-4897 (DLI roster listing) / (406) 841-2056 (State Building Codes Bureau — electrical, plumbing, mechanical, and non-covered commercial building)).

Apply through Town of West Yellowstone Building Department / Public Services — Building Inspector & Deputy Superintendent Kyle Tanner (listed as 'KC Tanner' on the Town's own Public Services page). Town is a Montana DLI-certified jurisdiction for Building (B), RESIDENTIAL ONLY. Commercial building permits, and Electrical, Plumbing, and Mechanical/HVAC permits of ANY project type, within West Yellowstone town limits are issued directly by the Montana Department of Labor & Industry Building Codes Bureau, not the Town. at 440 Yellowstone Avenue (PO Box 1570), West Yellowstone, MT 59758. Phone: (406) 646-7795 (Public Services main line) / (406) 646-7609 or (406) 640-9074 (Building Inspector Kyle/KC Tanner, ktanner@westyellowstone.gov) / 602-4897 (DLI roster listing) / (406) 841-2056 (State Building Codes Bureau — electrical, plumbing, mechanical, and non-covered commercial building), email: info@westyellowstone.gov (Public Services); ktanner@westyellowstone.gov (Building Inspector). Office hours: Town Hall / Public Services Office, 440 Yellowstone Ave, West Yellowstone, MT 59758, Monday-Friday 8:00 AM - 5:00 PM. Building Inspector: Kyle/KC Tanner, (406) 646-7609 / (406) 640-9074, ktanner@westyellowstone.gov.. Official information: https://www.townofwestyellowstone.com/public-services/.

West Yellowstone, 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 (building, plumbing, electrical, mechanical, swimming pool, etc.); non-certified areas/trades — and, where a town's Building certification is itself partial (e.g. residential-only), non-certified project types — 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/_docs/building-codes-permits/certified-city.pdf), directly fetched and text-extracted (PDF, updated 04/22/2026).; West Yellowstone is a Montana DLI-certified jurisdiction for Building (B), residential only, within town limits. The DLI Building Codes Bureau's "Montana Certified Local Government Program" roster (PDF, updated 04/22/2026) lists: "West Yellowstone | B (residential only) | Kyle Tanner | 602-4897 | City Limits". This is the same narrower certification pattern as Hardin, MT and Deer Lodge County/Anaconda-Deer Lodge (B, residential only), not the full-trade-set pattern of Manhattan (B, M, P, E, SP). One discrepancy to be aware of: the Town's own Public Services webpage names its Building Inspector/Deputy Superintendent as "KC Tanner" (ktanner@westyellowstone.gov, (406) 646-7609/640-9074). Surname and role match the roster's "Kyle Tanner," so they are presumably the same person, but the given-name difference is reported as it stands in the two source documents rather than reconciled.; COMMERCIAL building permits within West Yellowstone town limits are NOT covered by the Town's residential-only certification and are issued DIRECTLY by the Montana DLI Building Codes Bureau, exactly as in a non-certified jurisdiction. Electrical, Plumbing, and Mechanical/HVAC work — for BOTH residential AND commercial project types — likewise route DIRECTLY to the state DLI Building Codes Bureau, since West Yellowstone holds no certification in those trades at all. Source: Montana DLI Building Codes Bureau certified-jurisdictions roster PDF (updated 04/22/2026, directly fetched and text-extracted).; The Town of West Yellowstone's own Zoning Permit Process (Commercial) document states explicitly: 'These permits are obtained through the State of Montana Department of Labor and are subject to separate fee schedules. Applicants must provide proof of state building permit and obtain a Town of West Yellowstone Business License.' This independently corroborates the DLI roster's residential-only/state-routed-commercial finding directly from the Town's own published materials. Source: Town of West Yellowstone, Zoning Permit Process-Commercial (PDF), https://www.townofwestyellowstone.com/wp-content/uploads/2026/05/Commercial-Zoning-Permit-fillable.pdf; The Town's own downloadable Building Permit form ('Building-Permit-FINAL.pdf') is a Town-branded local form, not a reformatted state BCP-1 template (contrast with Hardin), and states on its face: 'Separate permits are required for Electrical, Plumbing, Heating, Ventilating or Air Conditioning' and 'This permit becomes null and void if work or construction authorized is not commenced within 180 days, or if work is suspended or abandoned for a period of 180 days at any time after work is commenced.' Source: Town of West Yellowstone Building Permit (PDF), https://www.townofwestyellowstone.com/wp-content/uploads/2026/05/Building-Permit-FINAL.pdf; West Yellowstone Municipal Code (WYMC) Title 15, Buildings and Construction, contains Chapter 15.04 'Uniform Codes Adopted' and Chapter 15.08 'Moving Buildings.' The Town's own Application for Mechanical Permit form cites 'Section 15.04.010 WYMC and Section 8.70.105 ARM' as its authority. Section 15.04.010(A) (fetched live via browser 2026-07-16 — codepublishing.com 403s to curl/plain fetch behind a Cloudflare challenge but renders normally in a browser) reads: 'The current editions of the building, mechanical and related codes and all accompanying appendices, amendments and modifications adopted by the Bureau of Building and Measurement Standards, Montana Department of Labor and Industry (or its successor)... shall be adopted by reference through administrative action of the operations manager, as authorized by Section 50-60-301(1)(b), MCA... These codes are applicable to all buildings within the building code enforcement area of the town, including, but not limited to, residential buildings containing less than five dwelling units...' This directly corroborates the Town's local Building (residential-only) certification deferring to state-adopted code editions, and resolves a prior review pass's 'honest access gap' note on this chapter — the text was reachable via a rendered browser fetch, not genuinely inaccessible.; The Town publishes its own Application for Mechanical Permit (citing WYMC 15.04.010) with a Town fee schedule and a Building Department contact at 646-7609. The current Montana DLI certified-jurisdiction roster, dated 04/22/2026, lists West Yellowstone as certified for Building (residential only) and not for Mechanical, which means mechanical permits are issued by the state. Plan for a state-issued mechanical permit, but call the Town Building Department at (406) 646-7609 before you file — the Town's own mechanical form is still published and the two sources do not agree.; Statewide adopted codes (Administrative Rules of Montana, Title 24, Chapter 301), applicable both to West Yellowstone's locally-certified residential Building program and to the state-enforced trades and commercial building work: 2021 International Building Code (IBC), 2021 International Residential Code (IRC), 2021 International Existing Building Code (IEBC), 2021 International Mechanical Code (IMC), 2021 International Fuel Gas Code (IFGC), 2020 National Electrical Code (NEC), 2021 Uniform Plumbing Code (UPC), 2021 International Energy Conservation Code (IECC), 2021 International Swimming Pool and Spa Code (ISPSC), ICC A117.1-2017 Accessibility — all effective June 11, 2022. Source: Montana DLI Building Codes Bureau, Current Codes page, https://bsd.dli.mt.gov/building-codes-permits/current-codes. Local amendments apply — see the West Yellowstone overview page for the full list.