Mechanical / HVAC Permit in Lehi, Utah
Required for heating, ventilation, and air conditioning installations, replacements, and ductwork modifications in Lehi.
Verified 2026-06-27 · Source
When you need this permit
- Furnace or boiler installation or replacement
- Air conditioning system installation or replacement
- Ductwork installation or major modification
- Evaporative cooler installation
- Fireplace or wood-burning stove installation
Required documents
- Req
Mechanical Plan
Equipment location, duct layout, and sizing calculations
- Req
Manual J Load Calculation
Heating/cooling load calculation for new systems
- Req
Contractor License
Valid Utah HVAC contractor license (DOPL)
- Opt
Equipment Specifications
Manufacturer data sheets for furnace, AC, or heat pump
Fee schedule
| Fee type | Amount | Notes |
|---|---|---|
| Mechanical Permit | $40-$75 base fee | — |
| Equipment | $15-$30 per piece of equipment | — |
| Ductwork | $25-$50 for new duct systems | — |
Review timeline
~3–7 business days
Typical estimate — confirm current times with the Lehi building department
Inspection process
- 1
Rough-In
Ductwork and gas piping installed, before walls closed — verify clearances and support
- 2
Final
Equipment operational, combustion air verified, gas pressure tested, thermostat functional
Tips
- Like-for-like furnace and AC replacements in Lehi still require a mechanical permit.
- Manual J calculations are required for all new HVAC systems — oversized systems will be flagged.
- High-efficiency furnaces require condensate drain lines — plan routing before installation.
- Lehi requires CO detectors on every level when gas appliances are installed.
Frequently asked questions
- Do I need a permit to replace my furnace in Lehi?
- Yes. Lehi requires a mechanical permit for all furnace replacements, even same-model swaps. The permit ensures proper venting, gas connections, and combustion air requirements are met.
- Do I need a Manual J calculation in Lehi?
- Yes, for new HVAC installations. Lehi follows the International Mechanical Code which requires a Manual J load calculation to properly size heating and cooling equipment.
Sources & verification
Key facts verified against official sources. Last reviewed 2026-06-27.
- Lehi City Building and Inspections — official building department
- Lehi City Code 10-2-2 — Building Permit & Plan Review Fees
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 Lehi building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.
Other permits in Lehi
Related guides
Get the AI compliance checklist
Upload your project scope, get a jurisdiction-specific checklist of everything you need. Coming soon.
We only use your email to send permit updates. No spam, unsubscribe anytime. Privacy.