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Mechanical / HVAC Permit in Littleton, Colorado

Required for heating, ventilation, air conditioning, and fuel-gas equipment installation or replacement in Littleton. Governed by the 2024 International Mechanical Code (IMC) and 2024 International Fuel Gas Code (IFGC) as locally adopted.

Verified 2026-07-05 · Source

When you need this permit

  • Permit required for installation, alteration, or replacement of mechanical/gas systems, per the City's Building Permit FAQ
  • Governed by the 2024 IMC and 2024 IFGC as adopted
  • Manual J, Manual D, and S calculations required (legible) if the heating system or ductwork is being installed, replaced, relocated, or altered
  • Contractors must hold applicable state licensure (Class D-11 HVAC/Mechanical ICC exam where required) plus a City of Littleton Contractor's License Contractor

Required documents

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Fee schedule

Permit fee — valuation-based (Permit Fee Schedule, Resolution 2025-105)
$25.85 minimum, scaling per valuation tiers
Plan Review Fee
65% of the permit fee, applicable only when plans are reviewed for code compliance

Review timeline

Plan review
Not published — contact the department

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

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

Inspection process

  1. 1

    Rough Heating

    Ductwork, flues, and equipment installed before concealment; must be approved (with rough plumbing and rough electrical) before rough framing inspection

  2. 2

    Final Inspection

    Equipment operational; combustion air and venting verified

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

Tips

  • New applicants for a Class D-11 (HVAC/Mechanical) City contractor license may be required to pass an ICC qualifying exam — confirm current requirements with the Permit Center before bidding work. Contractor
  • Manual J/D/S calculations must be legible — the Building Division has explicitly flagged illegible calculation submittals as a rejection reason.

Frequently asked questions

Yes, if the heating system itself is being replaced, or if ductwork is being replaced, relocated, or otherwise altered, the City requires legible Manual J, D, and S calculations as part of the submittal.

In Littleton, the published Permit fee — valuation-based (Permit Fee Schedule, Resolution 2025-105) is: $25.85 minimum, scaling per valuation tiers. Additional published fees: Plan Review Fee — 65% of the permit fee, applicable only when plans are reviewed for code compliance. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Littleton does not publish a plan-review timeline for this permit. Contact City of Littleton Building and Code Compliance Division (Community Development Department, Permit Center) at 303-795-3751 for current turnaround.

You'll need: Mechanical Permit Application (eTRAKiT Online System). Depending on your project, Littleton may also ask for: Manual J/D/S Calculations. See the required-documents checklist on this page for details on each.

Littleton requires 2 inspection(s) for a mechanical / hvac permit, in order: Rough Heating, Final Inspection. Schedule each through City of Littleton Building and Code Compliance Division (Community Development Department, Permit Center) (303-795-3751).

Apply through City of Littleton Building and Code Compliance Division (Community Development Department, Permit Center) at Littleton Center, 2255 W. Berry Avenue, Littleton, CO 80120. Phone: 303-795-3751, email: permits@littletonco.gov. Office hours: Permit Center: Monday-Thursday 8:00 a.m.-4:30 p.m., Fridays closed; in-person walk-in hours limited to Monday 1:00-4:30 p.m. (no walk-ins after 4:15 p.m.) and Thursday 8:00-11:30 a.m.; Building Inspections staff hours 7:30 a.m.-4:30 p.m. Monday-Friday. FAX 720-741-0210, eFax 720-384-0601.. Official information: https://www.littletonco.gov/Building-Development.

Littleton, Colorado has adopted: 2024 International Building Code (IBC) — City of Littleton Building Codes and Amendments page; 2024 International Residential Code (IRC); 2024 International Energy Conservation Code (IECC); 2024 International Existing Building Code (IEBC); 2024 International Fuel Gas Code (IFGC); 2024 International Mechanical Code (IMC); 2024 International Plumbing Code (IPC) — Littleton uses the International Plumbing Code, not the Uniform Plumbing Code; 2024 International Property Maintenance Code (IPMC); 2024 International Swimming Pool and Spa Code (ISPSC); 2024 International Wildland-Urban Interface Code (IWUIC); 2024 International Fire Code (IFC); ICC A117.1-2017 Standard with Supplement 1 — Accessible and Usable Buildings and Facilities; NFPA 70 National Electrical Code, 2026 Edition ("2026 NEC"); 1997 Uniform Code for the Abatement of Dangerous Buildings (International Conference of Building Officials); Colorado Model Electric Ready and Solar Ready Code, adopted by the Colorado Department of Local Affairs and Colorado Energy Office effective June 1, 2023; Littleton City Code Title 4, Chapter 1 — local IRC amendments including adopted Climatic and Geographic Design Criteria (Table R301.2): Ground Snow Load 40 psf (non-reducible), Ultimate Design Wind Speed 136 mph; Littleton City Code Title 3, Chapter 16 — Contractor Licensing (license/registration required to obtain permits within city limits, effective July 1, 1985). Local amendments apply — see the Littleton overview page for the full list.

Sources & verification

Verified against official sources. Last reviewed 2026-07-05.

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

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