Mechanical / HVAC Permit in Helena, Montana
VerifiedRequired 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
- Required
Mechanical Permit Application (City of Helena Building Division)
Application form for HVAC, boiler, wood stove, and other mechanical equipment installations
Fee schedule
| Fee type | Amount | Notes |
|---|---|---|
| Mechanical Permit — cost of mechanical system $0-$1,000 | $42.00 | City of Helena Mechanical Permit Fees (Exhibit A - Mechanical Fees); fee set at 100% of this schedule |
| Mechanical Permit — cost of mechanical system $1,001-$10,000 | $42.00 for the first $1,000 plus $14.00 for each additional $1,000 or fraction thereof up to and including $10,000 | City of Helena Mechanical Permit Fees (Exhibit A - Mechanical Fees) |
| Mechanical Permit — cost of mechanical system $10,001-$50,000 | $168.00 for the first $10,000 plus $7.00 for each additional $1,000 or fraction thereof up to and including $50,000 | City of Helena Mechanical Permit Fees (Exhibit A - Mechanical Fees) |
| Mechanical Permit — cost of mechanical system $50,001 and up | $448.00 for the first $50,000 plus $4.00 for each additional $1,000 or fraction thereof | City of Helena Mechanical Permit Fees (Exhibit A - Mechanical Fees) |
| Requested mechanical inspection | $56.00 for up to 1 hour; $28.00 for each additional 30 minutes or fraction thereof | City of Helena Mechanical Permit Fees (Exhibit A - Mechanical Fees); charged at 100% of this rate |
Review timeline
~1–5 business days
Typical estimate — confirm current times with the Helena building department
Inspection process
- 1
Rough-In / Equipment
Equipment installation and ductwork before walls closed
- 2
Final
Equipment operational, combustion air and venting verified
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
- What does a mechanical permit cost for a $6,000 furnace replacement in Helena?
- 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.
Sources & verification
Verified against official sources. Last reviewed 2026-07-02.
- City of Helena — Community Development Department, Building Division — official building department
- City of Helena — Building Permit Types (Mechanical section)
- City of Helena — Mechanical Permit Fees (PDF, Exhibit A)
- Montana DLI Building Codes Program — Certified City, County and Town Programs (Helena: B, P, E, M certified)
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.
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