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Mechanical / HVAC Permit in Helena, Montana

Required for any installation or alteration to heating, ventilation, air-conditioning, hood systems, boilers, wood stoves, or other miscellaneous heat-producing appliances within Helena city limits. The City of Helena is DLI-certified to enforce mechanical code within city limits under the 2021 International Mechanical Code (IMC) as adopted statewide by Montana.

Verified 2026-07-02 · Source

When you need this permit

  • Required for furnace, A/C, heat pump, boiler installation or replacement, ductwork, hood systems, and wood stoves
  • Exempt from permit: portable heating/ventilation/cooling appliances, steam/hot/chilled water piping within already-regulated equipment, like-kind replacement parts, self-contained refrigeration systems with 10 lbs or less of refrigerant and motors of 1 HP or less
  • Gas piping costs on a mechanical permit are charged per the plumbing fee's gas-piping schedule when no plumbing permit is otherwise required for the project
  • Governed by the 2021 International Mechanical Code (IMC) as adopted statewide by Montana effective June 11, 2022

Required documents

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Fee schedule

Mechanical Permit — cost of mechanical system $0-$1,000City of Helena Mechanical Permit Fees (Exhibit A - Mechanical Fees); fee set at 100% of this schedule
$42.00
Mechanical Permit — cost of mechanical system $1,001-$10,000City of Helena Mechanical Permit Fees (Exhibit A - Mechanical Fees)
$42.00 for the first $1,000 plus $14.00 for each additional $1,000 or fraction thereof up to and including $10,000
Mechanical Permit — cost of mechanical system $10,001-$50,000City of Helena Mechanical Permit Fees (Exhibit A - Mechanical Fees)
$168.00 for the first $10,000 plus $7.00 for each additional $1,000 or fraction thereof up to and including $50,000
Mechanical Permit — cost of mechanical system $50,001 and upCity of Helena Mechanical Permit Fees (Exhibit A - Mechanical Fees)
$448.00 for the first $50,000 plus $4.00 for each additional $1,000 or fraction thereof
Requested mechanical inspectionCity of Helena Mechanical Permit Fees (Exhibit A - Mechanical Fees); charged at 100% of this rate
$56.00 for up to 1 hour; $28.00 for each additional 30 minutes or fraction thereof

Review timeline

Plan reviewTypical estimate — confirm current times with the Helena building department
~1–5 business days

How long did your Mechanical / HVAC Permit permit actually take in Helena?

Anonymous — one question, no email. Answers are combined and only shown once at least 5 people have reported.

Inspection process

  1. 1

    Rough-In / Equipment

    Equipment installation and ductwork before walls closed

  2. 2

    Final

    Equipment operational, combustion air and venting verified

See the full Helena inspection guide — scheduling & re-inspection fees →

Tips

  • Helena's mechanical fee is based on the total cost of labor, materials, and equipment for the mechanical system — plumbing-system costs (covered by the UPC) are explicitly excluded from this calculation.
  • If gas piping work is needed but no separate plumbing permit is required for the project, the gas piping is charged per the plumbing fee's gas-outlet schedule ($8.50 for 1-4 outlets, $3.00/outlet for 5+), not the mechanical schedule.

Frequently asked questions

Helena requires a mechanical / hvac permit for: Required for furnace, A/C, heat pump, boiler installation or replacement, ductwork, hood systems, and wood stoves; Exempt from permit: portable heating/ventilation/cooling appliances, steam/hot/chilled water piping within already-regulated equipment, like-kind replacement parts, self-contained refrigeration systems with 10 lbs or less of refrigerant and motors of 1 HP or less; Gas piping costs on a mechanical permit are charged per the plumbing fee's gas-piping schedule when no plumbing permit is otherwise required for the project; Governed by the 2021 International Mechanical Code (IMC) as adopted statewide by Montana effective June 11, 2022. If your project isn't listed, confirm with City of Helena — Community Development Department, Building Division at (406) 447-8438 before starting work.

Per the City of Helena Mechanical Permit Fees schedule, a $6,000 system falls in the $1,001-$10,000 tier: $42.00 for the first $1,000 plus $14.00 for each additional $1,000 (5 additional thousands = $70.00), totaling $112.00.

Plan review for a mechanical / hvac permit in Helena typically runs 1–5 business days. This is an estimate, not a published figure — confirm current review times with City of Helena — Community Development Department, Building Division at (406) 447-8438.

You'll need: Mechanical Permit Application (City of Helena Building Division). See the required-documents checklist on this page for details on each.

Helena requires 2 inspection(s) for a mechanical / hvac permit, in order: Rough-In / Equipment, Final. Schedule each through City of Helena — Community Development Department, Building Division ((406) 447-8438).

Apply through City of Helena — Community Development Department, Building Division at 316 N. Park Avenue, Room 435, Helena, MT 59623. Phone: (406) 447-8438, email: CityBuilding@helenamt.gov. Office hours: City County Building, 316 N Park Ave, Helena, MT 59623; applications and permits also processed online via Civic Access (helenamt.gov/business/civic-access/). Official information: https://www.helenamt.gov/Departments/Community-Development/Building.

Helena, Montana has adopted: 2021 International Building Code (IBC) — Montana statewide adoption, effective June 11, 2022; enforced by the City of Helena within city limits under its DLI-certified Building Code Enforcement Program; 2021 International Residential Code (IRC), for One- and Two-Family Dwellings — Montana statewide adoption, effective June 11, 2022; City of Helena Building Division is the local Authority Having Jurisdiction (AHJ) for one- and two-family dwellings under IRC Chapters 8 and 9, including roofing/re-roofing; 2021 International Existing Building Code (IEBC) — Montana statewide adoption, effective June 11, 2022; ICC A117.1-2017 (Accessibility) — Montana statewide adoption, effective June 11, 2022; 2021 Uniform Plumbing Code (UPC) — Montana statewide adoption, effective June 11, 2022; City of Helena is certified to enforce plumbing (P) within city limits; 2021 International Mechanical Code (IMC) — Montana statewide adoption, effective June 11, 2022; City of Helena is certified to enforce mechanical (M) within city limits; 2021 International Fuel Gas Code (IFGC) — Montana statewide adoption, effective June 11, 2022; 2020 National Electrical Code (NEC) — Montana statewide adoption, effective June 11, 2022 (Technical Advisory NEC_TIA-23-3_210.8 issued August 12, 2022); City of Helena is certified to enforce electrical (E) within city limits; 2021 International Energy Conservation Code (IECC) — Montana statewide adoption, effective June 11, 2022; 2021 International Swimming Pool and Spa Code (ISPSC) — Montana statewide adoption, effective June 11, 2022; 2021 Wildland Urban Interface (WUI) Code — Montana statewide adoption, effective June 11, 2022 (Helena is NOT listed as WUI-certified; WUI enforcement in Helena's jurisdiction area is not confirmed — see notes); Statewide code administered by the Montana Department of Labor & Industry (DLI), Business Standards Division, Building Codes Program (formerly/also referenced as the Building Codes Bureau) — Mont. Code Ann. Title 50, Chapter 60, Parts 1-4. Local amendments apply — see the Helena overview page for the full list.

Sources & verification

Verified against official sources. Last reviewed 2026-07-02.

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 Helena building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.

Other permits in Helena

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Mechanical / HVAC Permit in other cities

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