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
- Req
Building/Mechanical Permit Application (eTRAKiT)
Westminster issues a single project permit; mechanical scope is entered on the same application with the applicable trade fee
- Opt
Gas Pipe Plan Submittal Requirements
Required for any gas line work or appliance replacement with higher BTU/hr input than the unit being replaced
Fee schedule
| Fee type | Amount | Notes |
|---|---|---|
| Permit Trade Fee — Mechanical | An additional 15% of the Building Permit Fee, plus 15% of the Plan Review Fee | City of Westminster Building Division Fee Schedule, effective January 1, 2026 |
| Furnace Replacement (Miscellaneous SFD Residential Permit) | $60.00 | May also require an electrical permit fee |
| Air Conditioner (Miscellaneous SFD Residential Permit) | $80.00 | May also require an electrical permit fee |
| Evaporative Cooler (Miscellaneous SFD Residential Permit) | $60.00 | May also require an electrical permit fee |
| Gas Log (Miscellaneous SFD Residential Permit) | $60.00 | See WMC Section 11-9-3(E)(2) for exceptions |
Review timeline
~1–1 business days
Typical estimate — confirm current times with the Westminster building department
Inspection process
- 1
Gas Piping
Pressure/leak test required before concealing new gas piping
- 2
Rough-In / Equipment
Equipment installation and ductwork before walls closed
- 3
Final
Equipment operational, combustion air and venting verified
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
- How much does a furnace replacement permit cost in Westminster?
- 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.
- Does Westminster use the International Fuel Gas Code?
- 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.
- City of Westminster — Department of Community Development, Building Division — official building department
- City of Westminster — Building Division
- Gas Pipe Plan Submittal Requirements (PDF)
- Building Division Fee Schedule, effective January 1, 2026 (PDF)
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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