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Mechanical / HVAC Permit in Gillette, Wyoming

Required for heating, cooling, ventilation, and gas piping installations in Gillette. Governed by the International Mechanical Code (IMC, City Code § 5-I-5) and International Fuel Gas Code (IFGC, § 5-I-7) — the City Code text reads 2021 Edition for both, not the 2024 Edition; see codesAdopted. Residential new HVAC is a flat unit fee; gas piping is billed by outlet count.

Verified 2026-07-16 · 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 Contractor

Required documents

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Fee schedule

Residential — New HVAC (up to 2 heating units, A/C unit, vents, ducts, bath fans, dryer vents, fireplaces)City Code § 5-IV-3(b)(1) (Revised 6-16-2026); $15 per each additional unit
$30.00
Residential — Replacement: furnace, woodstove, or heating unit (per unit)City Code § 5-IV-3(b)(2)(A), Mechanical Permit Fees — Unit Fee Schedule (Revised 6-16-2026)
$15.00
Residential — Replacement: air conditioning or cooling unit (per unit)City Code § 5-IV-3(b)(2)(B), Mechanical Permit Fees — Unit Fee Schedule (Revised 6-16-2026)
$15.00
Residential — Replacement: boiler unit (per unit)City Code § 5-IV-3(b)(2)(C), Mechanical Permit Fees — Unit Fee Schedule (Revised 6-16-2026)
$15.00
Residential — Miscellaneous (per unit)City Code § 5-IV-3(b)(2)(D), Mechanical Permit Fees — Unit Fee Schedule (Revised 6-16-2026)
$15.00
Commercial — New/Replacement: furnace, wood stove, heating unit, A/C window/cooling unit, or boiler unit (per unit)City Code § 5-IV-3(b)(3)(A)-(C), Mechanical Permit Fees — Unit Fee Schedule (Revised 6-16-2026)
$20.00 each
Commercial — Installation of grease hood or exhaust hood (per unit)City Code § 5-IV-3(b)(3)(D), Mechanical Permit Fees — Unit Fee Schedule (Revised 6-16-2026)
$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)$20 per additional unit
$75.00 flat fee
Gas piping system of 1 to 4 outletsCity Code § 5-IV-3(c)
$10.00
Gas piping system of 5 or more outlets (per outlet)City Code § 5-IV-3(c), Gas Pipefitting Permit Fees (Revised 6-16-2026)
$15.00

Review timeline

Plan reviewTypical estimate — confirm current times with the Gillette building department
~0–5 business days

How long did your Mechanical / HVAC Permit permit actually take in Gillette?

Anonymous — one question, no email. Answers are combined and only shown once at least 5 people have reported.

Inspection process

  1. 1

    Rough Mechanical

    After all venting and ductwork installed, before walls closed

  2. 2

    Gas

    After gas piping installed, supported, and under air test

  3. 3

    Final

    Equipment operational, combustion air and venting verified

See the full Gillette inspection guide — scheduling & re-inspection fees →

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

Gillette requires a mechanical / hvac permit for: 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. If your project isn't listed, confirm with City of Gillette Development Services — Building Division at (307) 686-5260 before starting work.

$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).

Plan review for a mechanical / hvac permit in Gillette typically runs 0–5 business days. This is an estimate, not a published figure — confirm current review times with City of Gillette Development Services — Building Division at (307) 686-5260.

You'll need: Mechanical Permit Application (via EnerGov Self Service). See the required-documents checklist on this page for details on each.

Gillette requires 3 inspection(s) for a mechanical / hvac permit, in order: Rough Mechanical, Gas, Final. Schedule each through City of Gillette Development Services — Building Division ((307) 686-5260).

Apply through City of Gillette Development Services — Building Division at City Hall, 201 E. 5th St., 2nd Floor, Gillette, WY 82716. Phone: (307) 686-5260, email: Not published on city site — use "Send an E-mail" contact form on the Building Division page or main line gillette@gillettewy.gov. Office hours: Mon–Fri (contact department for current hours); permits/plans/licenses/inspections managed via EnerGov Self Service online portal (registration required). Official information: https://www.gillettewy.gov/Departments/Development-Services/Building-Division.

Gillette, Wyoming has adopted: International Building Code (IBC), 2021 Edition — including Appendix C, adopted by City of Gillette Code Chapter 5, Article I § 5-I-2 (Revised 6-16-2026). CHANGED 2026-07-16 audit: the live § 5-I-2.A text now reads "2021 Edition, including Appendix C" and no longer cites Ord. 4052 (12-17-2024), which had adopted the 2024 IBC edition with Appendices C and H per the source PDF as of the prior 2026-07-01 verification; the 2024-edition adoption no longer appears in the current ordinance text.; International Residential Code (IRC), 2021 Edition — including Appendices AA, AB, AC, AE, AN, AQ, and AW (AW 3D Printed Construction), adopted § 5-I-3 (Revised 6-16-2026). CHANGED 2026-07-16 audit: the live § 5-I-3.A text now reads "2021 Edition" with this different appendix set (previously 2024 Edition, Appendices CA, CB, BA, CE, BB, BM per Ord. 4052, 12-17-2024, which no longer appears in the current ordinance text).; International Plumbing Code (IPC), 2021 Edition — including Appendices B, D, E, adopted § 5-I-4 (Revised 6-16-2026) — NOTE: Gillette uses the IPC, not the Uniform Plumbing Code. CHANGED 2026-07-16 audit: edition now reads 2021 (previously 2024 per Ord. 4052, 12-17-2024, no longer cited); appendices B, D, E unchanged.; International Mechanical Code (IMC), 2021 Edition — adopted § 5-I-5 (Revised 6-16-2026). CHANGED 2026-07-16 audit: edition now reads 2021 (previously 2024 per Ord. 4052, 12-17-2024, no longer cited).; National Electrical Code — City Code § 5-I-6 (Revised 6-16-2026) (including Article 80/Annex H). CHANGED 2026-07-16 audit: the live § 5-I-6.A paragraph now contains two different edition references in the same sentence — "...adopted by reference the National Electrical Code, 2023 Edition..." and later "...of the National Electrical Code, 2026 Edition, including Article 80, are hereby referred to, adopted..." — with the amendment history newly listing Ord. 4081 (6-16-2026) as the latest ordinance for this section. The ordinance's own text does not reconcile the two edition years; previously cited cleanly as 2023 Edition only.; International Fuel Gas Code (IFGC), 2021 Edition — including Appendices A, B, C, D, adopted § 5-I-7 (Revised 6-16-2026). CHANGED 2026-07-16 audit: edition now reads 2021 (previously 2024 per Ord. 4052, 12-17-2024, no longer cited); appendices A, B, C, D unchanged.; International Fire Code (IFC), 2021 Edition — including Appendices B, C, D, E, F, and G, adopted § 5-I-8 (Revised 6-16-2026). CHANGED 2026-07-16 audit: edition now reads 2021 and Appendices H and I are absent (previously 2024 Edition with Appendices B–I per Ord. 4052, 12-17-2024, no longer cited).; International Existing Building Code (IEBC), 2021 Edition — adopted § 5-I-9 (Revised 6-16-2026). CHANGED 2026-07-16 audit: § 5-I-9.A reads "2021 Edition" (previously cited as 2024 Edition; the current text carries no ordinance citation for the edition line).; Uniform Code for the Abatement of Dangerous Buildings, 1997 Edition — adopted § 5-I-10 (Revised 6-16-2026); edition unchanged, only the chapter revision date-stamp updated at the 2026-07-16 audit.. Local amendments apply — see the Gillette overview page for the full list.

Sources & verification

Verified against official sources. Last reviewed 2026-07-16.

Fee schedules

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.

Property Access

Gillette's permit history is searchable by address

414 permits in our copy of Gillette's register — searchable by street address, with permit type, status, issued date and valuation where the city publishes them. This is what we hold, not a statement of everything Gillette has issued.

All 414 carry an issued date, running from 2021 to 2026.

91% of Gillette's records carry a street address to match against, so a search that finds nothing here means we could not look — not that the property is clear.

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