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Mechanical / HVAC Permit in Westminster, Colorado

Required for heating, cooling, ventilation, and gas-fired equipment installations in Westminster, including furnaces, boilers, water heaters, evaporative coolers, and air conditioners. Governed by the 2021 IMC and 2021 IFGC with Westminster amendments.

Verified 2026-06-30 · Source

When you need this permit

  • Installation or replacement of HVAC equipment, including boilers, water heaters, furnaces, and tankless water heaters requires a permit
  • Evaporative (swamp) cooler installation or replacement requires a permit
  • Air conditioner installation or replacement requires a permit
  • Gas logs and gas lines require a permit; fireplace/inserts (wood, pellet, or gas) require a permit
  • Gas pipe plan required for any gas line work, or when a replacement appliance's input BTU/hr exceeds the appliance being replaced — must show meter delivery pressure (6" W.C., 12" W.C., or 2 psi per Xcel Energy) and a system drawing
  • Gas pipe sizing follows Appendix AA of the 2021 IRC or Appendix A of the 2021 IFGC; conversion uses 831 BTU/hr per CFH for Westminster (per Xcel Energy); no altitude derate factor is used under the current 2021 I-Codes

Required documents

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Fee schedule

Permit Trade Fee — MechanicalCity of Westminster Building Division Fee Schedule, effective January 1, 2026
An additional 15% of the Building Permit Fee, plus 15% of the Plan Review Fee
Furnace Replacement (Miscellaneous SFD Residential Permit)May also require an electrical permit fee
$60.00
Air Conditioner (Miscellaneous SFD Residential Permit)May also require an electrical permit fee
$80.00
Evaporative Cooler (Miscellaneous SFD Residential Permit)May also require an electrical permit fee
$60.00
Gas Log (Miscellaneous SFD Residential Permit)See WMC Section 11-9-3(E)(2) for exceptions
$60.00

Review timeline

Plan reviewTypical estimate — confirm current times with the Westminster building department
~1–1 business days

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

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

Inspection process

  1. 1

    Gas Piping

    Pressure/leak test required before concealing new gas piping

  2. 2

    Rough-In / Equipment

    Equipment installation and ductwork before walls closed

  3. 3

    Final

    Equipment operational, combustion air and venting verified

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

Tips

  • Furnace replacement ($60), A/C ($80), and evaporative cooler ($60) are flat-rate Miscellaneous SFD Residential Permits — faster than a full valuation-based review.
  • A gas pipe plan is required whenever a replacement appliance has a higher BTU/hr input than the unit it replaces — not just for brand-new gas lines.
  • Xcel Energy is the gas utility in Westminster; confirm your meter delivery pressure (6" W.C., 12" W.C., or 2 psi) before sizing gas pipe.

Frequently asked questions

Westminster requires a mechanical / hvac permit for: Installation or replacement of HVAC equipment, including boilers, water heaters, furnaces, and tankless water heaters requires a permit; Evaporative (swamp) cooler installation or replacement requires a permit; Air conditioner installation or replacement requires a permit; Gas logs and gas lines require a permit; fireplace/inserts (wood, pellet, or gas) require a permit; Gas pipe plan required for any gas line work, or when a replacement appliance's input BTU/hr exceeds the appliance being replaced — must show meter delivery pressure (6" W.C., 12" W.C., or 2 psi per Xcel Energy) and a system drawing; Gas pipe sizing follows Appendix AA of the 2021 IRC or Appendix A of the 2021 IFGC; conversion uses 831 BTU/hr per CFH for Westminster (per Xcel Energy); no altitude derate factor is used under the current 2021 I-Codes. If your project isn't listed, confirm with City of Westminster — Department of Community Development, Building Division at 303-658-2075 before starting work.

A furnace replacement is a flat $60.00 Miscellaneous SFD Residential Permit fee. It may also require an electrical permit fee if electrical work is involved.

Plan review for a mechanical / hvac permit in Westminster typically runs 1–1 business days. This is an estimate, not a published figure — confirm current review times with City of Westminster — Department of Community Development, Building Division at 303-658-2075.

You'll need: Building/Mechanical Permit Application (eTRAKiT). Depending on your project, Westminster may also ask for: Gas Pipe Plan Submittal Requirements. See the required-documents checklist on this page for details on each.

Westminster requires 3 inspection(s) for a mechanical / hvac permit, in order: Gas Piping, Rough-In / Equipment, Final. Schedule each through City of Westminster — Department of Community Development, Building Division (303-658-2075).

Apply through City of Westminster — Department of Community Development, Building Division at 4800 W. 92nd Avenue, Westminster, CO 80031. Phone: 303-658-2075, email: permits@westminsterco.gov. Office hours: Mon–Fri, 8 a.m.–5 p.m. (front office); residential permit review walk-through times: Tuesdays 1–4:30 p.m. and Thursdays 9 a.m.–noon; all permits must be applied for online via eTRAKiT. Official information: https://www.westminsterco.gov/621/Building-Division.

Westminster, Colorado has adopted: 2021 International Building Code (IBC) — with City of Westminster amendments; effective June 1, 2024; 2021 International Residential Code (IRC) — with City of Westminster amendments; effective June 1, 2024; 2021 International Fire Code (IFC) — with City of Westminster amendments; effective June 1, 2024; 2021 International Plumbing Code (IPC) — with City of Westminster amendments; effective June 1, 2024; 2021 International Mechanical Code (IMC) — with City of Westminster amendments; effective June 1, 2024; 2021 International Fuel Gas Code (IFGC) — with City of Westminster amendments; effective June 1, 2024; 2021 International Energy Conservation Code (IECC) — adopted per Westminster Municipal Code Section 11-9-11, meeting the Colorado HB22-1362 statewide minimum energy-code floor; Colorado Model Electric Ready and Solar Ready Code — adopted per Westminster Municipal Code Section 11-9-12, with Westminster amendments (waiver/variance provisions for commercial buildings over 10,000 sq ft and substantial cost differential appeals); 2023 National Electrical Code (NEC) / NFPA 70 — current edition (per Westminster's Commercial Plan Review Submittal Guidelines); the City has announced the 2026 NEC will become effective August 1, 2026, superseding the 2023 edition; ICC/ANSI A117.1-2017 — Standard for Accessible Design. Local amendments apply — see the Westminster overview page for the full list.

Yes. Westminster has adopted the 2021 International Fuel Gas Code (IFGC) with City amendments, effective June 1, 2024, alongside the 2021 IRC's Appendix AA for gas pipe sizing methodology.

Sources & verification

Verified against official sources. Last reviewed 2026-06-30.

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 Westminster building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.

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