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Mechanical / HVAC Permit in Middleton, Idaho

Required for all mechanical equipment installations in Middleton, including furnaces, HVAC systems, gas lines, and fireplaces. Governed by the 2018 International Mechanical Code and 2018 International Fuel Gas Code. Self-administered by the City Building Department.

Verified 2026-07-04 · Source

When you need this permit

  • Permit required before starting mechanical work; failure to obtain a permit prior to starting work results in double/triple fees
  • All permits applied for and issued through the CitizenServe portal; allow 24 hours for permit processing
  • Work must comply with the 2018 International Mechanical Code and 2018 International Fuel Gas Code

Required documents

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Fee schedule

New Residential — single family dwelling, up to 1,500 sq ft
$130.00
New Residential — single family dwelling, 1,501 to 2,500 sq ft
$195.00
New Residential — single family dwelling, 2,501 to 3,500 sq ft
$260.00
New Residential — single family dwelling, 3,501 to 4,500 sq ft
$325.00
Existing Residential
$65.00 basic fee plus $10.00 for each additional HVAC equipment item up to the maximum for the corresponding square footage
HVAC Only — fireplace installation
$130.00 (includes two inspections)
HVAC Gas Line
$65.00 basic fee
Hydronic Flooring
$65.00 basic fee plus $10.00 for each additional manifold/zone
Request inspection / re-inspection / technical service
$65.00 minimum plus $65.00 per hour or portion thereof in excess of one hour, including travel

Review timeline

Plan reviewMiddleton’s published plan-review target
1–1 business days

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

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

Inspection process

  1. 1

    Gas Piping Pressure Test

    Required before concealing gas piping

  2. 2

    Rough-In / Equipment

    HVAC equipment, ductwork, and gas lines before walls closed

  3. 3

    Final

    Equipment operational, venting and combustion air verified

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

Tips

  • Furnace/HVAC replacement in an existing home is billed at $65.00 basic fee plus $10.00 per piece of equipment.
  • Middleton's mechanical inspector is Terry Medley, (208) 484-3390.
  • Gas line work requires a separate mechanical permit fee of $65.00 even when combined with equipment replacement.

Frequently asked questions

Yes. Furnace/HVAC replacement in an existing residence requires a mechanical permit: $65.00 basic fee plus $10.00 per piece of equipment, per the City Fee Schedule (Resolution 526-25, Attachment D).

In Middleton, the published New Residential — single family dwelling, up to 1,500 sq ft is: $130.00. Additional published fees: New Residential — single family dwelling, 1,501 to 2,500 sq ft — $195.00; New Residential — single family dwelling, 2,501 to 3,500 sq ft — $260.00; New Residential — single family dwelling, 3,501 to 4,500 sq ft — $325.00; Existing Residential — $65.00 basic fee plus $10.00 for each additional HVAC equipment item up to the maximum for the corresponding square footage; HVAC Only — fireplace installation — $130.00 (includes two inspections); HVAC Gas Line — $65.00 basic fee; Hydronic Flooring — $65.00 basic fee plus $10.00 for each additional manifold/zone; Request inspection / re-inspection / technical service — $65.00 minimum plus $65.00 per hour or portion thereof in excess of one hour, including travel. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Middleton's published plan-review target for a mechanical / hvac permit is 1–1 business days.

You'll need: Mechanical Permit Application (Attachment D, Revised 8/1/2024). See the required-documents checklist on this page for details on each.

Middleton requires 3 inspection(s) for a mechanical / hvac permit, in order: Gas Piping Pressure Test, Rough-In / Equipment, Final. Schedule each through City of Middleton Building Department ((208) 585-3133).

Apply through City of Middleton Building Department at 1103 W Main St, Middleton, ID 83644. Phone: (208) 585-3133, email: citmid@middletoncity.org. Office hours: Mon–Fri 8:00 AM – 5:00 PM. Official information: https://middleton.id.gov/Departments/Building.

Middleton, Idaho has adopted: 2018 International Building Code (IBC), with Idaho amendments — adopted by reference via Middleton City Code Title 4, Chapter 1 (state-adopted code); 2018 International Residential Code (IRC), Parts I, II, III and IX — Idaho Residential Code (2020 Edition amendments); 2018 International Existing Building Code (IEBC); 2018 International Energy Conservation Code (IECC) — Idaho Energy Conservation Code (2020 Edition amendments); 2018 International Mechanical Code (IMC); 2018 International Fuel Gas Code (IFGC); 2018 International Residential Code Parts V & VI (mechanical); 2017 Idaho State Plumbing Code (based on 2015 Uniform Plumbing Code); 2023 National Electrical Code (NEC), with Idaho amendments; 2018 International Fire Code (IFC) — administered by the Idaho State Fire Marshal, not the City; ICC/ANSI A117.1-2009 (Accessible and Usable Buildings and Facilities). Local amendments apply — see the Middleton overview page for the full list.

Sources & verification

Verified against official sources. Last reviewed 2026-07-04.

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

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