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Mechanical / HVAC Permit — Great Falls, Montana · Requirements sheet
Verified 2026-07-02 · Source: https://greatfallsmt.gov/DocumentCenter/View/9952/Resolution---10374
PermitBase is an independent reference and is not affiliated with any government agency. Requirements change and vary by project — confirm current details with the building department before you submit.
Mechanical / HVAC Permit in Great Falls, Montana
Required for heating, ventilation, air conditioning, fuel gas, and related mechanical installations in Great Falls. Governed by the 2021 International Mechanical Code (IMC) and 2021 International Fuel Gas Code (IFGC) as adopted by the City of Great Falls. Homeowners may obtain a Homeowner's Mechanical Permit for owner-occupied residences.
Verified 2026-07-02 · Source
When you need this permit
- Mechanical permit required for installation, relocation, or alteration of furnaces, boilers, gas piping, and related equipment
- Homeowners may obtain a Homeowner's Mechanical Permit for work on their own owner-occupied, non-rental residence; work must be performed by the owner or an immediate family member residing there Owner-builder
- Governed by the 2021 IMC and 2021 IFGC as locally adopted
Required documents
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Fee schedule
Permit Issuance FeeResolution No. 10374, Exhibit A, Mechanical Permit Fees — Effective August 7, 2018; verified visually from the rendered resolution PDF page
$34.39
Furnace/burner installation or relocation — forced-air or gravity-type, up to and including 100,000 Btu/hResolution No. 10374, Exhibit A, Mechanical Permit Fees, Item 1 — verified visually from the rendered resolution PDF page (text extraction had column misalignment on this page; figure confirmed by direct visual read of the source PDF)
$19.04
Furnace/burner installation or relocation — over 100,000 Btu/hResolution No. 10374, Exhibit A, Mechanical Permit Fees, Item 1 — verified visually
$22.72
Floor furnace installation or relocation, including ventResolution No. 10374, Exhibit A, Mechanical Permit Fees, Item 1 — verified visually
$19.04
Gas piping system — per outletResolution No. 10374, Exhibit A, Mechanical Permit Fees, Item 2 — verified visually
$7.00
Mobile/Manufactured Home hookupResolution No. 10374, Exhibit A, Mechanical Permit Fees, Item 3 — verified visually
$19.04
Repair, alteration, or addition to heating/cooling/absorption appliance or systemResolution No. 10374, Exhibit A, Mechanical Permit Fees, Item 5 — verified visually
$17.68
Ventilation fan connected to a single ductResolution No. 10374, Exhibit A, Mechanical Permit Fees, Item 9 — verified visually
$10.07
Re-inspection FeeCity of Great Falls Homeowner's Mechanical Permit Application (Updated 3/2026) — current rate; supersedes the $62.62/hr figure in Resolution 10374
$67.63 per hour, minimum 1-hour charge
Investigation Fee (work commenced before permit issuance)Resolution No. 10374, Exhibit A, Mechanical Permit Fees, Item 5 (Other Inspection and Fees)
Equal to the permit fee
Review timeline
Plan reviewTypical estimate — confirm current times with the Great Falls building department
~1–10 business days
Inspection process
- 1
Gas Piping Pressure Test
Required before concealing gas piping
- 2
Rough-In
Ductwork and mechanical equipment rough-in before walls closed
- 3
Final
Equipment operational, combustion air and venting verified
See the full Great Falls inspection guide — scheduling & re-inspection fees →
Tips
- A typical furnace replacement (up to 100,000 Btu/h) costs $34.39 (issuance) + $19.04 (unit fee) = $53.43 in Great Falls, per Resolution 10374.
- Contact the City Mechanical Inspector at (406) 455-8533 before starting a homeowner-permitted mechanical project.
- The mechanical fee page of Resolution 10374 is dense and multi-column — all figures used here were cross-verified by rendering the source PDF to an image and reading it visually, not just text-extracted, due to known column-alignment risk in this document.
Frequently asked questions
Yes. Furnace replacement requires a mechanical permit. For a standard forced-air furnace up to 100,000 Btu/h, the fee is $34.39 (issuance) plus $19.04 (unit fee) per Resolution No. 10374, Exhibit A.
In Great Falls, the published Permit Issuance Fee is: $34.39. Additional published fees: Furnace/burner installation or relocation — forced-air or gravity-type, up to and including 100,000 Btu/h — $19.04; Furnace/burner installation or relocation — over 100,000 Btu/h — $22.72; Floor furnace installation or relocation, including vent — $19.04; Gas piping system — per outlet — $7.00; Mobile/Manufactured Home hookup — $19.04; Repair, alteration, or addition to heating/cooling/absorption appliance or system — $17.68; Ventilation fan connected to a single duct — $10.07; Re-inspection Fee — $67.63 per hour, minimum 1-hour charge; Investigation Fee (work commenced before permit issuance) — Equal to the permit fee. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.
Plan review for a mechanical / hvac permit in Great Falls typically runs 1–10 business days. This is an estimate, not a published figure — confirm current review times with City of Great Falls Building Division (Planning & Community Development Department) at (406) 455-8430.
Depending on your project, Great Falls may also ask for: Homeowner's Mechanical Permit Application. See the required-documents checklist on this page for details on each.
Great Falls requires 3 inspection(s) for a mechanical / hvac permit, in order: Gas Piping Pressure Test, Rough-In, Final. Schedule each through City of Great Falls Building Division (Planning & Community Development Department) ((406) 455-8430).
Apply through City of Great Falls Building Division (Planning & Community Development Department) at Civic Center, 2 Park Drive South, Room 112, P.O. Box 5021, Great Falls, MT 59403-5021. Phone: (406) 455-8430, email: permit@greatfallsmt.gov. Office hours: Mon-Fri 8:00 AM - 5:00 PM. Official information: https://greatfallsmt.gov/627/Building-Division.
Great Falls, Montana has adopted: 2021 International Building Code (IBC) — adopted by the City of Great Falls September 9, 2022, effective per city adoption (state effective date June 11, 2022 under ARM Title 24, Chapter 301); city stopped accepting the prior 2018-cycle codes as of November 9, 2022; 2021 International Residential Code (IRC) — adopted September 9, 2022; 2021 International Existing Building Code (IEBC) — adopted September 9, 2022; 2021 Uniform Plumbing Code (UPC) — adopted September 9, 2022 (Montana uses the UPC, not the International Plumbing Code); 2021 International Mechanical Code (IMC) — adopted September 9, 2022; 2021 International Fuel Gas Code (IFGC) — adopted September 9, 2022; 2020 National Electrical Code (NEC) — adopted September 9, 2022 (Montana's statewide NEC edition is 2020, not 2021, per ARM Title 24, Chapter 301); 2021 International Energy Conservation Code (IECC) — adopted September 9, 2022; 2021 International Swimming Pool and Spa Code (ISPSC) — adopted September 9, 2022; 2021 International Wildland-Urban Interface Code (IWUIC) — part of the certified program scope ("W"); ICC A117.1-2017 Accessibility Code — statewide standard incorporated by reference; 2021 International Fire Code (IFC) — adopted separately by the City of Great Falls effective May 25, 2023 (amending OCCGF Title 15), administered by Great Falls Fire Rescue rather than the Building Division. Local amendments apply — see the Great Falls 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 Great Falls building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.
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