Mechanical / HVAC Permit in Post Falls, Idaho
VerifiedRequired for heating, ventilation, air conditioning, and related mechanical installations in Post Falls, governed by the 2018 International Mechanical Code (IMC) and International Fuel Gas Code (IFGC) as adopted by the City.
Verified 2026-07-03 · Source
When you need this permit
- Mechanical permit required for installation or relocation of furnaces, heat pumps, air handlers, ventilation systems, gas piping, and appliance vents
- Governed by the 2018 IMC and 2018 IFGC as adopted by the City of Post Falls
- Processing fee of $18.00 on all permits (plus a stated $45.00 mechanical permit base fee heading) plus per-unit fees based on appliance type and capacity
- Residential ducted systems require heat load calculations (ACCA Manuals J & D or approved software) submitted with the Mechanical Permit Application
- Apply through the Community Development Portal
Required documents
- Required
Mechanical Permit Application
Submitted online through the Community Development Portal; may be submitted after the initial Building Permit application
- Required
Residential HVAC Review Form
City of Post Falls form for residential HVAC system review
- Optional
Residential HVAC Air-Balancing Form
City of Post Falls form documenting air-balancing for ducted HVAC systems
Fee schedule
| Fee type | Amount | Notes |
|---|---|---|
| Processing fee on all permits | $18.00 | City of Post Falls Fee Schedule, rev 10-1-2025 |
| Furnace, all types under 100 KBTU | $22.00 | City of Post Falls Fee Schedule, rev 10-1-2025 |
| Furnace, all types over 100 KBTU | $15.00 | City of Post Falls Fee Schedule, rev 10-1-2025 |
| Misc. venting, C/A, duct modifications | $25.00 | City of Post Falls Fee Schedule, rev 10-1-2025 |
| Gas fireplace | $16.00 | City of Post Falls Fee Schedule, rev 10-1-2025 |
| Residential range hood | $15.00 | City of Post Falls Fee Schedule, rev 10-1-2025 |
| Gas water heater | $10.00 | City of Post Falls Fee Schedule, rev 10-1-2025 |
| Ventilating/exhaust fans | $5.00 | City of Post Falls Fee Schedule, rev 10-1-2025 |
| Gas piping, each outlet | $16.00 | City of Post Falls Fee Schedule, rev 10-1-2025 |
| Clothes dryers | $16.00 | City of Post Falls Fee Schedule, rev 10-1-2025 |
| Heat pump, A/C 0-3 tons | $30.00 | City of Post Falls Fee Schedule, rev 10-1-2025 |
| Heat pump, A/C 3+ to 15 tons | $40.00 | City of Post Falls Fee Schedule, rev 10-1-2025 |
| Heat pump, A/C 15+ to 30 tons | $60.00 | City of Post Falls Fee Schedule, rev 10-1-2025 |
| Heat pump, A/C 30+ to 50 tons | $100.00 | City of Post Falls Fee Schedule, rev 10-1-2025 |
| Air handlers/fan coil units under 10,000 CFM | $20.00 | City of Post Falls Fee Schedule, rev 10-1-2025 |
| Air handlers/fan coil units over 10,000 CFM | $25.00 | City of Post Falls Fee Schedule, rev 10-1-2025 |
| Evaporative coolers, all types | $15.00 | City of Post Falls Fee Schedule, rev 10-1-2025 |
| Commercial Mechanical Plan Review | 25% of the Mechanical Permit fee | City of Post Falls Fee Schedule, rev 10-1-2025 |
Review timeline
Not published
Post Falls does not publish a plan-review timeline — contact the building department for current turnaround.
Inspection process
- 1
Rough-In
Ductwork and mechanical equipment rough-in before walls closed; gas piping pressure test before concealment
- 2
Final
Equipment operational; exhaust vents verified; gas appliance clearances and shutoff valves verified
Tips
- Residential ducted HVAC systems require ACCA Manual J & D heat-load calculations submitted with the Mechanical Permit Application, along with the Residential HVAC Review Form.
- A typical furnace replacement under 100 KBTU costs $18.00 processing + $22.00 for the appliance = $40.00 minimum.
- Gas piping is billed per outlet ($16.00 each) in addition to the $18.00 processing fee.
Frequently asked questions
- How much does a mechanical permit cost for a furnace replacement in Post Falls?
- The mechanical permit processing fee is $18.00, plus $22.00 for a furnace under 100 KBTU (or $15.00 if over 100 KBTU), per the City of Post Falls Fee Schedule, rev 10-1-2025.
Sources & verification
Verified against official sources. Last reviewed 2026-07-03.
- City of Post Falls Community Development Department, Building Division — official building department
- Fee Schedule (PDF) | City of Post Falls
- Residential HVAC Review Form (PDF) | City of Post Falls
- Residential HVAC Air-Balancing Form (PDF) | City of Post 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 Post Falls building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.
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