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Mechanical Permit (HVAC, Gas Work) in Lewiston, Idaho

Required for all residential and commercial installation of air conditioners, water heaters, furnaces, etc., and all gas work in the City of Lewiston, per the adopted 2018 IMC. Issued by City of Lewiston Building Services.

Verified 2026-07-04 · Source

When you need this permit

  • Required for residential and commercial installation of air conditioners, water heaters, furnaces, etc., and all gas work — City of Lewiston Permits Needed page
  • Compliance with the 2018 IMC as adopted by the City of Lewiston (January 2021)

Required documents

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Fee schedule

New Single Family Dwelling (up to 1,500 sq ft)City of Lewiston FY2026 Fee Schedule, Schedule F, Mechanical Permit Fees.
$216.56, plus $72.20 for each additional 1,000 sq ft or portion thereof
New DuplexCity of Lewiston FY2026 Fee Schedule.
$433.11
Existing Residence (one HVAC equipment included) / Modular, Manufactured, or Mobile Homes / Detached ShopCity of Lewiston FY2026 Fee Schedule.
$72.20, plus $11.10 for each additional HVAC equipment installed, up to the maximum of the corresponding square footage fee
Gas LineCity of Lewiston FY2026 Fee Schedule.
$72.20
Kitchen Range HoodsCity of Lewiston FY2026 Fee Schedule.
$72.20
Solid Fuel/Gas Fuel ApplianceCity of Lewiston FY2026 Fee Schedule.
$72.20 per inspection
Hydronic HeatingCity of Lewiston FY2026 Fee Schedule.
$72.20, plus $11.10 times the number of zones
Requested Inspection or Miscellaneous InspectionsCity of Lewiston FY2026 Fee Schedule.
$72.20 per hour
Commercial, Multi-family (3+ units), Industrial, Alternative Energy — valuation up to $10,000City of Lewiston FY2026 Fee Schedule.
$66.63 plus valuation x 0.032
Commercial, Multi-family (3+ units), Industrial, Alternative Energy — valuation $10,001 to $100,000City of Lewiston FY2026 Fee Schedule.
$288.74 plus (valuation - $10,000) x 0.028
Commercial, Multi-family (3+ units), Industrial, Alternative Energy — valuation $100,001 and upCity of Lewiston FY2026 Fee Schedule.
$1,288.24 plus (valuation - $100,000) x 0.015
Mechanical Plan Review FeeCity of Lewiston FY2026 Fee Schedule.
$39.77 or 25% of the mechanical permit fee, whichever is greater

Review timeline

Plan reviewLewiston’s published plan-review target
8–14 business days

How long did your Mechanical Permit (HVAC, Gas Work) permit actually take in Lewiston?

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

Inspection process

  1. 1

    Rough Mechanical

    Ductwork, gas line, and equipment inspection consistent with the adopted 2018 IMC.

  2. 2

    Final

    Final mechanical inspection.

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

Tips

  • Gas lines, kitchen range hoods, and solid/gas fuel appliances are each billed at the flat $72.20 rate in addition to any new-dwelling mechanical fee.

Frequently asked questions

Lewiston requires a mechanical permit (hvac, gas work) for: Required for residential and commercial installation of air conditioners, water heaters, furnaces, etc., and all gas work — City of Lewiston Permits Needed page; Compliance with the 2018 IMC as adopted by the City of Lewiston (January 2021). If your project isn't listed, confirm with City of Lewiston Building Services (Community Development Department) at (208) 746-1318, option 1 for Permit Representatives before starting work.

In Lewiston, the published New Single Family Dwelling (up to 1,500 sq ft) is: $216.56, plus $72.20 for each additional 1,000 sq ft or portion thereof. Additional published fees: New Duplex — $433.11; Existing Residence (one HVAC equipment included) / Modular, Manufactured, or Mobile Homes / Detached Shop — $72.20, plus $11.10 for each additional HVAC equipment installed, up to the maximum of the corresponding square footage fee; Gas Line — $72.20; Kitchen Range Hoods — $72.20; Solid Fuel/Gas Fuel Appliance — $72.20 per inspection; Hydronic Heating — $72.20, plus $11.10 times the number of zones; Requested Inspection or Miscellaneous Inspections — $72.20 per hour; Commercial, Multi-family (3+ units), Industrial, Alternative Energy — valuation up to $10,000 — $66.63 plus valuation x 0.032; Commercial, Multi-family (3+ units), Industrial, Alternative Energy — valuation $10,001 to $100,000 — $288.74 plus (valuation - $10,000) x 0.028; Commercial, Multi-family (3+ units), Industrial, Alternative Energy — valuation $100,001 and up — $1,288.24 plus (valuation - $100,000) x 0.015; Mechanical Plan Review Fee — $39.77 or 25% of the mechanical permit fee, whichever is greater. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Lewiston's published plan-review target for a mechanical permit (hvac, gas work) is 8–14 business days.

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

Lewiston requires 2 inspection(s) for a mechanical permit (hvac, gas work), in order: Rough Mechanical, Final. Schedule each through City of Lewiston Building Services (Community Development Department) ((208) 746-1318, option 1 for Permit Representatives).

Apply through City of Lewiston Building Services (Community Development Department) at 215 D Street, Lewiston, ID 83501 (P.O. Box 617, Lewiston, ID 83501). Phone: (208) 746-1318, option 1 for Permit Representatives, email: cd@cityoflewiston.org. Office hours: Monday-Friday, 8:00 AM to 5:00 PM. Building Official: Jeff Wolfe, (509) 254-3275, jwolfe@cityoflewiston.org. Permit Representatives: Lorrie Tanguay, (208) 746-1318 ext. 7203; Adrian Miller, (208) 746-1318 ext. 7263.. Official information: https://www.cityoflewiston.org/227/Building-Services.

Lewiston, Idaho has adopted: 2018 International Building Code (IBC), plus 2021 IBC Mass Timber provisions, adopted January 2025 for commercial construction — City of Lewiston Current Codes page (Lewiston City Code Sec. 10-1, Code Adoption).; 2018 International Residential Code (IRC), adopted January 2021, for one- and two-family dwellings and townhouses — City of Lewiston Current Codes page.; 2018 International Energy Conservation Code (IECC), adopted January 2021 — City of Lewiston Current Codes page.; 2018 International Mechanical Code (IMC), adopted January 2021 — City of Lewiston Current Codes page.; Idaho State Plumbing Code, based on the 2015 Uniform Plumbing Code (UPC), adopted January 2021 — City of Lewiston Current Codes page.; 2018 International Fire Code (IFC), adopted January 2021 — City of Lewiston Current Codes page.; 2023 National Electrical Code (NEC), adopted January 2025 — City of Lewiston Current Codes page.; 2018 International Existing Building Code (IEBC), adopted January 2021 — City of Lewiston Current Codes page.; The Current Codes page states local amendments to the adopted codes exist and directs readers to Lewiston City Code Sec. 10-1 (Code Adoption) for the specific amendment text; the amendments themselves are not individually enumerated on the Current Codes web page.. Local amendments apply — see the Lewiston overview page for the full list.

The City of Lewiston adopted the 2018 International Mechanical Code (IMC) in January 2021, per the City's Current Codes page.

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

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