Mechanical / HVAC Permit in Unincorporated Natrona County, Wyoming
VerifiedRequired for heating, cooling, and fuel-gas appliance installations in unincorporated Natrona County. Governed by the 2024 International Mechanical Code (IMC, Resolution 88-24) and 2024 International Fuel Gas Code (IFGC, Resolution 87-24).
Verified 2026-07-01 · Source
When you need this permit
- Mechanical Permit Application submitted to the Natrona County Building Department
- Specify Applicant Type (Owner/Contractor) and fuel type (Natural Gas, Liquid Propane Gas, Other)
- Disclose whether work is being done on Casper/Natrona County Airport property (special jurisdiction flag on the form)
- Nature of Project: New Construction, Basement Finish, New Installation, or Replacement
- Quantity and type of appliance must be listed: A/C (tonnage), mini-split (tonnage), boiler (BTU), refrigeration units (tonnage), furnace (BTU), pellet stove, wood stove, gas fireplace (BTU), unit heaters (BTU), infrared/tube heat (BTU), commercial air handler (CFM), wall heater (BTU), residential/commercial clothes dryers, evaporative cooler
- Job valuation must be declared for fee calculation
Required documents
- Req
Natrona County Mechanical Permit Application (2025)
Covers HVAC equipment installation/replacement and fuel-gas appliances
Fee schedule
| Fee type | Amount | Notes |
|---|---|---|
| Mechanical Permit Fee — valuation-based (same table as building permits) | $70 (valuation $0–$2,500) up to $905 plus $9.24 per additional $1,000 over $98,000 | Natrona County Permit Fees, Resolution No. 45-20 — mechanical/HVAC has no separate flat fee; uses the same combined valuation-based schedule. |
| Mechanical Contractor License — Initial | $300 (Contractor); $75 (Master); $25 (Journeyman); $3 (Apprentice) | Natrona County Contractor Fees (Revised 02/21) |
| Mechanical Contractor License — Annual Renewal | $75 (Contractor); $37.50 (Master); $15 (Journeyman); $3 (Apprentice) | — |
Review timeline
~3–10 business days
Typical estimate — confirm current times with the Unincorporated Natrona County building department
Inspection process
- 1
Rough-In / Equipment
Equipment placement and ductwork/venting before walls closed
- 2
Final
Equipment operational, combustion air and venting verified
Tips
- Work on Casper/Natrona County Airport property is specifically flagged on the mechanical application — airport-area projects may involve additional coordination beyond the standard county permit process.
- The mechanical application itemizes appliance types by tonnage/BTU/CFM — have your equipment specs ready when applying.
Frequently asked questions
- Do I need a mechanical permit to replace a furnace in unincorporated Natrona County?
- Yes. Furnace replacement is a 'Replacement' project type on the county's Mechanical Permit Application, requiring the furnace's BTU rating. The permit fee follows the same valuation-based table as all other trade permits (Resolution No. 45-20).
Sources & verification
Verified against official sources. Last reviewed 2026-07-01.
- Natrona County Building Department — official building department
- Natrona County Mechanical Permit Application (2025)
- Natrona County Permit Fees — Resolution No. 45-20
- Resolution Adopting 2024 International Mechanical Code (Resolution 88-24)
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 Natrona County building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.
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