Mechanical / HVAC Permit in Gillette, Wyoming
VerifiedRequired for heating, cooling, ventilation, and gas piping installations in Gillette. Governed by the 2024 International Mechanical Code (IMC, City Code § 5-I-5) and 2024 International Fuel Gas Code (IFGC, § 5-I-7). Residential new HVAC is a flat unit fee; gas piping is billed by outlet count.
Verified 2026-07-01 · Source
When you need this permit
- Residential new HVAC covers up to 2 heating units, A/C unit, vents, ducts, bath fans, dryer vents under one flat fee; additional units are billed per-unit
- Residential replacement HVAC (furnace, woodstove, heating unit, A/C, boiler) is billed per unit
- Commercial new/replacement HVAC has its own per-unit and flat-fee structure
- Gas piping systems are billed by outlet count
- Contractor must hold a City of Gillette Class D HVAC/Mechanical or Gas Pipefitters contractor license
Required documents
- Req
Mechanical Permit Application (via EnerGov Self Service)
Apply online through the City of Gillette EnerGov Self Service portal
Fee schedule
| Fee type | Amount | Notes |
|---|---|---|
| Residential — New HVAC (up to 2 heating units, A/C unit, vents, ducts, bath fans, dryer vents, fireplaces) | $30.00 | City Code § 5-IV-3(b)(1) (Revised 12-2024); $15 per each additional unit |
| Residential — Replacement: furnace, woodstove, or heating unit (per unit) | $15.00 | — |
| Residential — Replacement: air conditioning or cooling unit (per unit) | $15.00 | — |
| Residential — Replacement: boiler unit (per unit) | $15.00 | — |
| Residential — Miscellaneous (per unit) | $15.00 | — |
| Commercial — New/Replacement: furnace, wood stove, heating unit, A/C window/cooling unit, or boiler unit (per unit) | $20.00 each | — |
| Commercial — Installation of grease hood or exhaust hood (per unit) | $20.00 | — |
| Commercial — New construction/alteration of Commercial Building HVAC (flat fee: heating unit, venting, ducts, A/C unit, grease hood, bathroom fan, dryer vent) | $75.00 flat fee | $20 per additional unit |
| Gas piping system of 1 to 4 outlets | $10.00 | City Code § 5-IV-3(c) |
| Gas piping system of 5 or more outlets (per outlet) | $15.00 | — |
Review timeline
~0–5 business days
Typical estimate — confirm current times with the Gillette building department
Inspection process
- 1
Rough Mechanical
After all venting and ductwork installed, before walls closed
- 2
Gas
After gas piping installed, supported, and under air test
- 3
Final
Equipment operational, combustion air and venting verified
Tips
- The $30 residential new-HVAC flat fee covers up to 2 heating units plus A/C, vents, ducts, bath fans, and dryer vents — a good value for a full new-construction HVAC package.
- Commercial new-construction HVAC is a $75 flat fee covering the whole system, with $20 per additional unit beyond the base package.
Frequently asked questions
- How much does a furnace replacement cost in Gillette?
- A residential furnace, woodstove, or heating unit replacement is $15.00 per unit under City Code § 5-IV-3(b)(2).
- How much does a gas line permit cost in Gillette?
- $10.00 for a gas piping system of 1 to 4 outlets, or $15.00 per outlet for systems of 5 or more outlets, per City Code § 5-IV-3(c).
Sources & verification
Verified against official sources. Last reviewed 2026-07-01.
- City of Gillette Development Services — Building Division — official building department
- City of Gillette Code, Chapter 5 Buildings (Revised 12-2024), § 5-I-5 IMC Adoption, § 5-I-7 IFGC Adoption, § 5-IV-3 Mechanical/Gas Permit 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 Gillette building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.
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