Mechanical / HVAC Permit in Unincorporated Davis County, Utah
Required for heating, ventilation, and air conditioning installations, replacements, and ductwork modifications in Unincorporated Davis County.
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 | Valuation-based per Davis County fee schedule ($200 minimum) | — |
| Plan Review | 65% of permit fee | — |
| State Surcharge | 1% of permit fee | — |
Review timeline
~3–7 business days
Typical estimate — confirm current times with the Unincorporated Davis County 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 Unincorporated Davis County 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.
- Unincorporated Davis County requires CO detectors on every level when gas appliances are installed.
Frequently asked questions
- Do I need a permit to replace my furnace in Unincorporated Davis County?
- Yes. Unincorporated Davis County 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 Unincorporated Davis County?
- Yes, for new HVAC installations. Unincorporated Davis County 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.
- Davis County Community & Economic Development — official building department
- Davis County Building Fee Schedule
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 Unincorporated Davis County building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.
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