Plumbing Permit (State-Administered) in Miles City, Montana

Yes. Water heater installation or replacement requires a state Plumbing Permit for $25, issued by the Montana Building Codes Bureau (not the city), since Miles City is not plumbing-certified. Apply by mail to PO Box 200517, Helena, MT 59620-0517, or online at ebiz.mt.gov.

In Miles City, the published Gray water system, commercial or residential is: $60. Additional published fees: Repair or alteration of drainage or vent piping — $30; Alteration or repair of water piping and/or treatment — $30; 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; Each NEW water heater (or replacement) — $25; Each storm drain and storm drainage — $30; Each lawn sprinkler, fire protection system, any meter, or backflow protection device — $30; Each hose bibb, vacuum breaker, and/or backflow device — $6; Each industrial water pre-treatment equipment including its drainage and vent — $30; Each plumbing fixture or trap (bath tub, lavatory, shower, water closet, kitchen sink, etc.) — $10 per fixture/trap. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Miles City's published plan-review target for a plumbing permit (state-administered) is 1–15 business days.

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

Apply through City of Miles City Building Department at 17 S. 8th St., Miles City, MT 59301. Phone: (406) 874-8611, email: gmartinsen@milescity-mt.org. Office hours: Monday-Friday 7:00 AM - 4:00 PM (Building Inspector); City Hall general hours Mon-Fri 8:00 AM - 5:00 PM. Official information: https://www.milescitymt.gov/building-department.

Miles City, 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; a certified local program's adopted code 'may include only codes adopted by the Building Codes Bureau' (ARM 24.301.202). Non-certified trades within a jurisdiction fall under direct state administration by the DLI Building Codes Bureau. Source: Montana DLI Building Codes Bureau, Certified City, County and Town Programs and Current Codes pages (bsd.dli.mt.gov/building-codes-permits).; Miles City is a Montana DLI-certified jurisdiction for Building (B), Swimming Pool (SP), and Electrical — residential only — within Miles City city limits; certified program contact on file with DLI: Gabe Martinsen, (406) 874-8611. Miles City is NOT certified for Plumbing or Mechanical, or for commercial Electrical — those permits/inspections are issued directly by the Montana DLI Building Codes Bureau (Helena) even within Miles City city limits. Source: Montana DLI Building Codes Bureau, Certified City, County and Town Programs list (List of certified jurisdictions table), bsd.dli.mt.gov/building-codes-permits/certified-government; Miles City City Code § 5-2(a): the city adopts by ordinance 'the current editions of the building codes and all accompanying appendices, amendments and modifications' adopted by the DLI Building Codes Bureau, as authorized by MCA 50-60-301(1)(b) — the city does not maintain independently amended code text; it tracks whatever edition the state Building Codes Bureau currently has in force for local-government jurisdictions. Source: Miles City Code of Ordinances § 5-2, Municode (Ord. No. 1132, 5-28-02; most recently amended by Ord. No. 1375, 1-23-24); International Residential Code (IRC), 2021 Edition, as amended by ARM 24.301.154 — adopted by City of Miles City Code § 5-46 (Ord. No. 1375, 1-23-24); 2021 Existing Building Code, as amended by ARM 24.301.171 — adopted by City of Miles City Code § 5-61(a) (Ord. No. 1375, 1-23-24); 2021 International Swimming Pool and Spa Code, as amended by ARM 24.301.175 — adopted by City of Miles City Code § 5-61(b); Miles City is DLI-certified for Swimming Pool (SP) permitting (Ord. No. 1375, 1-23-24); 2021 International Energy Conservation Code, as amended by ARM 24.301.161 — adopted by City of Miles City Code § 5-61(c) (Ord. No. 1375, 1-23-24); National Electrical Code (NEC), 2020 Edition, as amended by ARM 24.301.401 — adopted by City of Miles City Code § 5-76 (Ord. No. 1392, 3-11-25); Miles City is DLI-certified for residential Electrical permitting only — commercial electrical work in Miles City is permitted and inspected directly by the state DLI Building Codes Bureau; International Building Code (IBC) — applicable via § 5-2(a)'s blanket adoption of the DLI Building Codes Bureau's current edition (2021 IBC statewide, effective June 11, 2022); the City of Miles City Building Permit Application form itself references IBC Section 105.3.2 (180-day application-abandonment provision) and IBC Section 110 (duty to request inspection); 2021 Uniform Plumbing Code (UPC) and 2021 International Mechanical Code (IMC)/International Fuel Gas Code (IFGC) — statewide editions; state-administered in Miles City since the city holds no Plumbing or Mechanical DLI certification; Miles City Code § 24-65 (Zoning, Article III): locally adopted Accessory Dwelling Unit (ADU) performance standards, including a Tiny Home provision referencing International Residential Code Appendix Q. Local amendments apply — see the Miles City overview page for the full list.

The Montana Department of Labor & Industry Building Codes Bureau issues plumbing permits for all of Miles City and Custer County under the 2021 Uniform Plumbing Code — the city itself is not DLI-certified for plumbing.