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Residential Mechanical / HVAC Permit in Nampa, Idaho

Required for all mechanical equipment installations in Nampa residences, including furnaces, air conditioners, heat pumps, gas piping, ductwork, gas fireplaces, and HVAC replacements. Governed by the 2018 International Mechanical Code and 2018 International Fuel Gas Code.

Verified 2026-06-29 · Source

When you need this permit

  • All mechanical equipment installations require a permit before work begins
  • Must be performed by a licensed mechanical contractor holding a valid Idaho Contractor's License Contractor
  • Gas piping installers must hold a state of Idaho gas piping license
  • Homeowner exception: owner of R-3/R-4/U occupancy may perform own mechanical work if residing in dwelling within 180 days after completion
  • Hardship exception: immediate family member may perform work for family member unable to do so
  • Unvented gas fireplaces require supplemental whole-house ventilation strategy (Nampa local amendment to IMC section 903)

Required documents

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Fee schedule

New residential dwelling (R-3/R-4) mechanical — under 2,000 sq ft habitable areaNampa Exhibit A — New Group R sub-contractor permit fee (covers installations within the dwelling unit)
$180.00 per dwelling unit
New residential dwelling (R-3/R-4) mechanical — 2,000+ sq ft habitable area
$325.00 per dwelling unit
Residential mechanical (additions/remodels) — base feeNampa Exhibit A — base fee for all residential sub-trade addition/remodel permits
$36.00 base
Mechanical equipment (residential, additions/remodels) — per applianceNampa Exhibit A — Mechanical Extras: 'Mechanical equipment (residential only) $15.00'
$15.00 per piece of equipment
Venting without new appliance (residential only)Nampa Exhibit A — Mechanical Extras
$15.00
Gas piping pressure testNampa Exhibit A — Mechanical Extras
$15.00
Reinspection (after first reinspection for same item)
$55.00 flat fee

Review timeline

Plan reviewTypical estimate — confirm current times with the Nampa building department
~3–7 business days

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

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Inspection process

  1. 1

    Gas Piping Pressure Test

    Required before concealing gas piping — verify no leaks under test pressure

  2. 2

    Rough-In / Equipment

    HVAC equipment, ductwork, and gas lines rough-in before walls closed

  3. 3

    Final

    Equipment operational, combustion air verified, venting correct, controls functional

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

Tips

  • Nampa's local amendment requires unvented gas fireplaces to have a supplemental whole-house ventilation strategy (air-to-air heat exchanger or engineered system) — plan for this before installing an unvented gas fireplace.
  • Ductwork must be properly sized for room-by-room calculated heating and cooling loads per Nampa's local mechanical requirements.
  • All ductwork must be sealed and provide balanced supply/return air flow per Nampa's adopted IMC amendments.
  • Gas piping work requires a separate mechanical permit even if combined with a furnace replacement.
  • Idaho law allows homeowners to perform their own mechanical work on their primary/secondary residence provided they reside there within 180 days of completion.

Frequently asked questions

Yes. Furnace replacement requires a mechanical permit. For a remodel/addition, the fee is $36 base plus $15 per piece of mechanical equipment = $51 per Nampa's Exhibit A fee schedule. Homeowners may pull their own permit.

In Nampa, the published New residential dwelling (R-3/R-4) mechanical — under 2,000 sq ft habitable area is: $180.00 per dwelling unit. Additional published fees: New residential dwelling (R-3/R-4) mechanical — 2,000+ sq ft habitable area — $325.00 per dwelling unit; Residential mechanical (additions/remodels) — base fee — $36.00 base; Mechanical equipment (residential, additions/remodels) — per appliance — $15.00 per piece of equipment; Venting without new appliance (residential only) — $15.00; Gas piping pressure test — $15.00; Reinspection (after first reinspection for same item) — $55.00 flat fee. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Plan review for a residential mechanical / hvac permit in Nampa typically runs 3–7 business days. This is an estimate, not a published figure — confirm current review times with Nampa Building Safety & Code Department at (208) 468-5435.

You'll need: Mechanical Permit Application (2024). See the required-documents checklist on this page for details on each.

Nampa requires 3 inspection(s) for a residential mechanical / hvac permit, in order: Gas Piping Pressure Test, Rough-In / Equipment, Final. Schedule each through Nampa Building Safety & Code Department ((208) 468-5435).

Apply through Nampa Building Safety & Code Department at 500 12th Ave South, Nampa, ID 83651. Phone: (208) 468-5435, email: buildinginspections@cityofnampa.us. Office hours: Mon–Fri 8:00 AM – 5:00 PM. Official information: https://www.cityofnampa.us/163/Building-Safety-Code.

Nampa, Idaho has adopted: 2018 International Residential Code (IRC); 2018 International Building Code (IBC); 2018 International Existing Building Code (IEBC); 2018 International Fire Code (IFC); 2018 International Energy Conservation Code (IECC) — Residential and Commercial; 2018 International Mechanical Code (IMC); 2018 International Fuel Gas Code (IFGC); 2017 Idaho State Plumbing Code; 2023 National Electrical Code (NEC); 2009 ICC/ANSI/A117.1 (Accessibility); 2015 NFPA A30 Code for Motor Fuel Dispensing Facilities and Repair Garages; 2015 NFPA 99 Health Care Facilities Code. Local amendments apply — see the Nampa overview page for the full list.

Yes, but Nampa has a local amendment requiring that unvented gas fireplaces be paired with a supplemental whole-house ventilation strategy (such as an air-to-air heat exchanger or engineered ventilation system) to mitigate combustion by-products. The system must operate any time the fireplace is in use.

Sources & verification

Verified against official sources. Last reviewed 2026-06-29.

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

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Residential Mechanical / HVAC Permit in other cities

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