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Mechanical / HVAC Permit in Lone Tree, Colorado

Required for heating, cooling, and ventilation equipment installation or replacement in Lone Tree, including air conditioners, furnaces, and water heaters. Governed by the 2021 International Mechanical Code (IMC) and 2021 International Fuel Gas Code (IFGC) as adopted. Douglas County Use Tax is explicitly waived on mechanical-only permits.

Verified 2026-07-06 · Source

When you need this permit

  • Governed by the 2021 IMC and 2021 IFGC as adopted by the City of Lone Tree
  • Air conditioners, new furnaces, and water heaters are explicitly named by the City as requiring a permit
  • Billed from the same shared valuation-based fee table as Building/Electrical/Plumbing permits
  • Douglas County Use Tax not collected on mechanical-only permits/projects (examples given: air conditioners, furnaces, water heaters, gas lines)

Required documents

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Fee schedule

Mechanical Permit Fee (same valuation-based schedule as Building/Electrical/Plumbing)2026 Building Division Fee Schedule
$23.50 minimum, scaling per the valuation tiers in the 2026 Building Fees schedule
Plan Review Fee
65% of Permit Fee, minimum $100.00
Douglas County Use Tax
Not collected on mechanical-only permits/projects

Review timeline

Plan review
Not published — contact the department

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

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

Inspection process

  1. 1

    Rough Mechanical

    Ductwork, flues, and equipment placement before concealment

  2. 2

    Final Inspection

    Equipment operational, combustion air and venting verified

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

Tips

  • New furnace and water heater installations are explicitly named by the City as requiring a permit — do not assume like-for-like equipment swaps are automatically exempt; see the dedicated furnace-water-heater-replacement permit type for the narrower replacement-specific scope.

Frequently asked questions

Yes. The City's Do I Need a Building Permit guidance explicitly lists air conditioners among the examples of work requiring a permit.

In Lone Tree, the published Mechanical Permit Fee (same valuation-based schedule as Building/Electrical/Plumbing) is: $23.50 minimum, scaling per the valuation tiers in the 2026 Building Fees schedule. Additional published fees: Plan Review Fee — 65% of Permit Fee, minimum $100.00; Douglas County Use Tax — Not collected on mechanical-only permits/projects. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Lone Tree does not publish a plan-review timeline for this permit. Contact City of Lone Tree Community Development Department, Building Division at 720-390-5211 for current turnaround.

You'll need: Building Permit Application (Mechanical scope). See the required-documents checklist on this page for details on each.

Lone Tree requires 2 inspection(s) for a mechanical / hvac permit, in order: Rough Mechanical, Final Inspection. Schedule each through City of Lone Tree Community Development Department, Building Division (720-390-5211).

Apply through City of Lone Tree Community Development Department, Building Division at 9220 Kimmer Dr., Suite 100, Lone Tree, CO 80124. Phone: 720-390-5211, email: building@cityoflonetree.com. Office hours: 7:00 AM - 4:00 PM, Monday-Friday, excluding holidays/weekends. Chief Building Official: Matt Archer. Community Development Director: Kelly First (kelly.first@cityoflonetree.com, 720-509-1274). General city line: 303-708-1818.. Official information: https://cityoflonetree.com/community-development/building/.

Lone Tree, Colorado has adopted: 2021 International Building Code (IBC), as amended — City of Lone Tree Design Criteria & Codes page; 2021 International Residential Code (IRC), as amended; 2021 International Fire Code (IFC); 2021 International Plumbing Code (IPC); 2021 International Mechanical Code (IMC); 2021 International Fuel Gas Code (IFGC); 2021 International Energy Conservation Code (IECC); 2023 National Electrical Code (NEC); 2017 ICC A117.1 Accessibility Code; Note on Chapter 18 (Building Regulations), Lone Tree Municipal Code: search-indexed content confirms the City has adopted the International Building Code, 2021 Edition, as amended, with a certified copy on file with the City Clerk; a local amendment adds Section 105.3.8 'Soils Test,' requiring a soils test prepared by a Colorado-registered professional engineer at building permit application, with an engineering geologist additionally required for hillside/geological-hazard/steep-slope sites at the Building Official's discretion. Full text of Chapter 18 could not be independently re-verified beyond this indexed excerpt because library.municode.com/co/lone_tree serves an Angular single-page app shell (empty of code text without JS rendering) and returned HTTP 403 to both a standard fetch and a full-browser-header curl retry — this is a partial-confidence caveat on the amendment-detail level only, not on the base code-edition list, which is independently confirmed on the City's own actively-maintained Design Criteria & Codes page.; HB22-1362 statewide energy floor (Colorado): as of 2026-07-06 (this review date), HB22-1362 requires that municipalities/counties updating their building code adopt an energy code achieving equivalent-or-better performance than the 2021 IECC + Model Electric and Solar Ready Code (effective window 7/1/2023-6/30/2026), stepping up to the Colorado Energy Code Board's Model Low Energy and Carbon Code (published 9/2/2025) as the new statewide minimum for any code update on or after 7/1/2026. Lone Tree's currently-published adopted energy code is the 2021 IECC (per its own Design Criteria & Codes page, most recent update not dated on-page) — this predates the 7/1/2026 Model Low Energy and Carbon Code trigger point and does not itself violate HB22-1362, since that stricter floor applies only when a jurisdiction next updates its code. Flagged honestly rather than assumed; confirm current status with the Building Division (720-390-5211) before relying on this for a 2026-cycle project, since Lone Tree could adopt updated codes at any time.. Local amendments apply — see the Lone Tree overview page for the full list.

Sources & verification

Verified against official sources. Last reviewed 2026-07-06.

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

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Mechanical / HVAC Permit in other cities

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