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Residential Mechanical / HVAC Permit in Boise, Idaho

Required for heating, ventilation, air conditioning, fuel gas, and related mechanical installations in Boise single-family dwellings and duplexes. Covers furnaces, A/C, heat pumps, ductwork, gas fireplaces, gas piping, dryer vents, range hoods, and bath exhaust fans.

Verified 2026-07-16 · Source

When you need this permit

  • Install or change any part of a heating or cooling system
  • Furnace, air conditioner, heat pump, or boiler installation or replacement
  • Ductwork installation or major modification
  • Gas piping installation or pressure testing
  • Wood stoves, pellet stoves, gas fireplaces installation
  • Gas piping and fuel oil tank installation or modification

Required documents

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Fee schedule

New SFD / Duplex mechanical — up to 1,500 sq ftBoise Mechanical Code and Fuel Gas Code Fee Schedule, Table B(1) (Oct 2021)
$130 per dwelling unit
New SFD / Duplex mechanical — 1,501 to 2,500 sq ft
$180 per dwelling unit
New SFD / Duplex mechanical — 2,501 to 3,500 sq ft
$250 per dwelling unit
New SFD / Duplex mechanical — 3,501 to 4,500 sq ft
$290 per dwelling unit
New SFD / Duplex mechanical — 4,501 sq ft or more
$325 per dwelling unit, plus $65 per each additional 1,000 sq ft over 4,501 sq ft
Single mechanical fixture/appliance installation (existing residence)Table B(3) — applies to single furnace, A/C, mini-split, gas fireplace, gas piping, pellet stove, woodstove, pool heater, gas fire pit, solar thermal system, etc.
$55
Multiple fixtures — residential addition, alteration, or repair (base fee + per fixture)Table B(2) — applies to alterations involving multiple fixtures: furnaces, A/C, mini-splits, gas piping pressure tests, ductwork, dryer exhaust, bath exhaust, range hoods, etc.
$32 base, plus $12 per appliance/fixture
Reinspection Fee
$55

Review timeline

Plan reviewTypical estimate — confirm current times with the Boise building department
~1–10 business days

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

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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

    Ductwork and mechanical equipment rough-in before walls closed — verify clearances and support

  3. 3

    Final

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

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

Tips

  • Gas piping work (including gas fireplace hookups) requires a Mechanical Permit in Boise — not a Plumbing Permit.
  • Boise single-family residential mechanical work is governed by 2018 IRC Parts V and VI (not the IMC, which applies to commercial/3+ unit projects).
  • Like-for-like furnace and A/C replacements require a permit in Boise.
  • Idaho allows homeowners to perform mechanical work on their own residence; a permit and inspection are still required.

Frequently asked questions

Yes. Furnace replacements require a Mechanical Permit (422). For a single appliance replacement in an existing single-family home, the fee is $55 per Boise's Mechanical Code Fee Schedule, Table B(3).

In Boise, the published New SFD / Duplex mechanical — up to 1,500 sq ft is: $130 per dwelling unit. Additional published fees: New SFD / Duplex mechanical — 1,501 to 2,500 sq ft — $180 per dwelling unit; New SFD / Duplex mechanical — 2,501 to 3,500 sq ft — $250 per dwelling unit; New SFD / Duplex mechanical — 3,501 to 4,500 sq ft — $290 per dwelling unit; New SFD / Duplex mechanical — 4,501 sq ft or more — $325 per dwelling unit, plus $65 per each additional 1,000 sq ft over 4,501 sq ft; Single mechanical fixture/appliance installation (existing residence) — $55; Multiple fixtures — residential addition, alteration, or repair (base fee + per fixture) — $32 base, plus $12 per appliance/fixture; Reinspection Fee — $55. 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 Boise typically runs 1–10 business days. This is an estimate, not a published figure — confirm current review times with Boise Planning and Development Services — Building Division at (208) 608-7070.

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

Boise requires 3 inspection(s) for a residential mechanical / hvac permit, in order: Gas Piping Pressure Test, Rough-In, Final. Schedule each through Boise Planning and Development Services — Building Division ((208) 608-7070).

Apply through Boise Planning and Development Services — Building Division at 150 N Capitol Blvd, Boise, ID 83702. Phone: (208) 608-7070, email: permits@cityofboise.org. Office hours: Mon–Fri 8:00 AM – 5:00 PM (closed holidays). Official information: https://www.cityofboise.org/departments/planning-and-development-services/building/.

Boise, Idaho has adopted: 2018 International Building Code (IBC) — with Appendices H (Signs) and J (Grading); Mass Timber provisions only of the 2021 IBC; 2018 International Existing Building Code (IEBC); 2018 International Residential Code (IRC), Parts I–IV and IX — with Appendices Q (Tiny Houses) and S (Strawbale Construction); 2018 International Energy Conservation Code (IECC); 2017 Idaho State Plumbing Code (based on the 2015 Uniform Plumbing Code, including Chapter 13 – Medical Gas); 2023 National Electrical Code (NEC) — effective April 26, 2024; 2018 International Fire Code (IFC) — with Appendices B, C, D, F and L; 2019 NFPA 13; 2019 NFPA 72; 2018 International Mechanical Code (IMC) — commercial and residential projects with 3+ units; 2018 International Fuel Gas Code (IFGC) — commercial and residential projects with 3+ units; 2018 IRC Parts V and VI — single- and two-family residential mechanical and fuel gas. Local amendments apply — see the Boise overview page for the full list.

Mechanical Permit. Gas piping, fuel gas systems, and boilers are covered under the Mechanical/Fuel Gas permit (422) in Boise, not the Plumbing permit.

Sources & verification

Verified against official sources. Last reviewed 2026-07-16.

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

Other permits in Boise

Residential Building Permit (New Construction)Residential Addition / Alteration PermitResidential Electrical PermitEV Charger / EVSE Installation PermitResidential Plumbing PermitResidential Roofing PermitSolar Photovoltaic (PV) PermitAccessory Dwelling Unit (ADU) PermitWater Heater PermitNew Commercial Building and Commercial Additions Permit (502)Tenant Improvement Permit — Minor (518) and Major (520)

Residential Mechanical / HVAC Permit in other cities

Ammon, IdahoCaldwell, IdahoChubbuck, IdahoCoeur d'Alene, IdahoEagle, IdahoHayden, IdahoIdaho Falls, IdahoKootenai County, Idaho

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