Mechanical / HVAC Permit in City of Deer Lodge, Montana

Generally, single-family and duplex residential buildings (fewer than five dwelling units) are exempt from the Montana state mechanical permit requirement, per the Building Codes Bureau's published exemptions. Larger residential, commercial, and other non-exempt mechanical work requires a State Mechanical Permit, since the City of Deer Lodge is not a certified jurisdiction for mechanical permitting.

In City of Deer Lodge, the published Mechanical Permit — project value $0 to $10,000 is: $48 for the first $1,000 plus $14 for each additional $1,000 or fraction thereof. Additional published fees: Mechanical Permit — project value $10,001 to $50,000 — $166 for the first $10,000 plus $9 for each additional $1,000 or fraction thereof; Mechanical Permit — project value $50,001 or more — $514 for the first $50,000 plus $6 for each additional $1,000 or fraction thereof. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

City of Deer Lodge does not publish a plan-review timeline for this permit. Contact City of Deer Lodge Building Inspector — city-certified for Building permits only (residential); Electrical, Plumbing, and Mechanical permits are issued directly by the Montana Department of Labor & Industry Building Codes Bureau at (406) 310-6965 (Sean Beach, Building Inspector) / (406) 846-2238 (City Hall main line, fax 406-846-3925) / (406) 841-2056 (State Building Codes Bureau — electrical, plumbing, mechanical) for current turnaround.

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

City of Deer Lodge requires 3 inspection(s) for a mechanical / hvac permit, in order: Gas Piping Pressure Test, Rough-In, Final. Schedule each through City of Deer Lodge Building Inspector — city-certified for Building permits only (residential); Electrical, Plumbing, and Mechanical permits are issued directly by the Montana Department of Labor & Industry Building Codes Bureau ((406) 310-6965 (Sean Beach, Building Inspector) / (406) 846-2238 (City Hall main line, fax 406-846-3925) / (406) 841-2056 (State Building Codes Bureau — electrical, plumbing, mechanical)).

Apply through City of Deer Lodge Building Inspector — city-certified for Building permits only (residential); Electrical, Plumbing, and Mechanical permits are issued directly by the Montana Department of Labor & Industry Building Codes Bureau at 300 Main Street, Deer Lodge, MT 59722 (city Building Permits); Building Codes Bureau, PO Box 200517, Helena, MT 59620-0517 (state electrical/plumbing/mechanical permits). Phone: (406) 310-6965 (Sean Beach, Building Inspector) / (406) 846-2238 (City Hall main line, fax 406-846-3925) / (406) 841-2056 (State Building Codes Bureau — electrical, plumbing, mechanical), email: Contact via the City of Deer Lodge website's staff-directory contact form for Sean Beach, Building Inspector (no direct email address is published in plain text; the site uses a CivicPlus anti-spam contact-form redirect for all staff emails); Building Codes Bureau email available via bsd.dli.mt.gov contact links. Office hours: Monday - Friday 8:00 AM - 5:00 PM, closed weekends and holidays. Official information: https://www.cityofdeerlodgemt.gov/building-inspector.

City of Deer Lodge, Montana has adopted: City of Deer Lodge is a MONTANA CERTIFIED LOCAL GOVERNMENT for BUILDING permitting only, RESIDENTIAL ONLY — per the Montana Building Codes Bureau's official 'Certified Local Government Building Code Jurisdictions' roster (updated 04/22/2026), entry: 'Deer Lodge (City) — B (residential only) — Sean Beach — 846-2238 — City Limits.' This is a SEPARATE line item on the same roster from 'Deer Lodge County — B (residential only) — Greg Bahr — 563-4010 — County' (the Anaconda-Deer Lodge consolidated government), confirming these are two distinct, independently-certified jurisdictions with different building officials.; The City's own Residential Building Permit portal (iWorQ) states directly: 'All residential building permits are reviewed by the City of Deer Lodge,' while 'Mechanical, electrical, plumbing, and commercial building permits are reviewed by the State of Montana' — confirming the Building-only, residential-only certification scope in the city's own words, independent of the state roster.; Statutory basis for the certified-local-government model: a city, county, or town may adopt a building code by ordinance and enforce it locally ONLY if certified by the Building Codes Program as complying with applicable statutes/rules (current adopted code, current fee list, and enforcement plan filed and approved) — per ARM Title 24, chapter 301, subchapter 2 (Local Jurisdiction Administrative Rules) and Title 50, chapter 60, MCA (Local Jurisdiction Statutes). Absent local certification for a given trade (electrical/plumbing/mechanical/commercial building here), the State Building Codes Bureau retains jurisdiction under Title 50, chapter 60, MCA.; Statewide adopted codes (Administrative Rules of Montana, Title 24, chapter 301), verified directly against the Montana Building Codes Bureau's Current Codes page, apply as the substantive code baseline for both the locally-certified residential Building program and the state-enforced trades/commercial building: 2021 International Building Code (IBC), effective June 11, 2022; 2021 International Residential Code (IRC), effective June 11, 2022; 2021 International Existing Building Code (IEBC), effective June 11, 2022; ICC A117.1 Accessibility, 2017 Edition, effective June 11, 2022; 2021 Uniform Plumbing Code (UPC), effective June 11, 2022 — enforced directly by the State Building Codes Bureau in Deer Lodge (not locally certified); 2021 International Mechanical Code (IMC), effective June 11, 2022 — enforced directly by the State Building Codes Bureau in Deer Lodge (not locally certified); 2021 International Fuel Gas Code (IFGC), effective June 11, 2022 — enforced directly by the State Building Codes Bureau; 2020 National Electrical Code (NEC), effective June 11, 2022 — enforced directly by the State Building Codes Bureau in Deer Lodge (not locally certified); 2021 International Energy Conservation Code (IECC), effective June 11, 2022; 2021 International Swimming Pool and Spa Code (ISPSC), effective June 11, 2022; 2021 Wildland Urban Interface Code, effective June 11, 2022. Local amendments apply — see the City of Deer Lodge overview page for the full list.

The State of Montana Building Codes Bureau, not the city. Deer Lodge's own permit portal confirms mechanical permits are reviewed by the State of Montana.