Mechanical / HVAC Permit in Idaho Falls, Idaho
VerifiedRequired for heating, ventilation, air conditioning, and related mechanical installations in Idaho Falls, governed by the 2018 International Mechanical Code (IMC) and 2018 International Fuel Gas Code (IFGC). Mechanical permits within city limits are issued and inspected directly by the City of Idaho Falls Building Division (Chief Plumbing/Mechanical Inspector and Mechanical Inspector on staff).
Verified 2026-07-03 · Source
When you need this permit
- Mechanical permit required for installation, relocation, or replacement of furnaces, HVAC equipment, ductwork, and gas appliance venting
- Governed by the 2018 IMC and 2018 IFGC per the City of Idaho Falls Mechanical page
- Duct design must be completed using Manual J load calculations matching the selected equipment and the contractor's submitted prescriptive insulation values
- For equipment change-outs: a final inspection is sufficient if the existing gas line is reused; a new gas line requires a gas pressure inspection and rough-in inspection before the final
- PVC vent piping must be pressure-tested and labeled with the test date and the name of the person who verified the test
- An air balance report must be uploaded to the permit prior to final inspection
- Apply through the Cityworks portal
Required documents
- Required
Mechanical Permit Application
Submitted online through the Cityworks portal
- Required
Manual J Load Calculation / Duct Design
Duct design matching the selected equipment and prescriptive insulation values
- Required
Air Balance Report
Required to be uploaded to the permit before final inspection
Fee schedule
| Fee type | Amount | Notes |
|---|---|---|
| Residential Mechanical Permit Issuance | $5.10 per installation | City of Idaho Falls Fee Schedule (October 2025), item 2.11.b |
| Commercial Mechanical Permit — first $20,000 of bid amount | 1.50% of first $20,000 of bid amount | City of Idaho Falls Fee Schedule (October 2025), item 2.10.b.i; bid amount includes total cost of equipment, materials, and labor governed by the Uniform Mechanical Code |
| Commercial Mechanical Permit — bid amount in excess of $20,000 | 0.75% of bid amount over $20,000 | City of Idaho Falls Fee Schedule (October 2025), item 2.10.b.ii |
| Permit Issuance Fee | $30.18 | City of Idaho Falls Fee Schedule (October 2025), item 2.13.a |
Review timeline
Not published
Idaho Falls does not publish a plan-review timeline — contact the building department for current turnaround.
Inspection process
- 1
Rough-In
Ductwork per approved duct design; venting for exhaust fans/HVAC equipment; gas pressure verification; duct sealing; PVC vent pressure testing and labeling
- 2
Final
Equipment sizing matches approved duct design; all venting/registers/grills installed; gas equipment fully operational; air balance report uploaded; A/C equipment fully charged and connected
Tips
- For equipment change-outs where the gas line already exists, only a final inspection is required; a new gas line requires both a gas pressure/rough-in inspection and a final.
- PVC vent piping must be clearly marked with the date and name of the person who performed the pressure test.
- An air balance report is a required upload before the final inspection can be approved.
Frequently asked questions
- Do I need a permit to replace my furnace in Idaho Falls?
- Yes. A mechanical permit and follow-up inspection are required to confirm the installation was performed correctly and safely. Source: City of Idaho Falls FAQ.
Sources & verification
Verified against official sources. Last reviewed 2026-07-03.
- City of Idaho Falls Building Division (Department of Community Development Services) — official building department
- Mechanical | City of Idaho Falls
- 2025-2026 Fee Schedule (PDF) | City of Idaho Falls
- Idaho Falls City Code Title 7, Chapter 7 — International Mechanical Code (PDF)
- Idaho Falls City Code Title 7, Chapter 4 — International Fuel Gas Code (PDF)
- Work Exempt from a Permit - Mechanical (PDF) | City of Idaho Falls
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 Idaho Falls building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.
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