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Mechanical / HVAC Permit in Castle Rock, Colorado

Required for heating, cooling, and gas-fired equipment installation/replacement in Castle Rock, governed by the 2024 International Mechanical Code (IMC) and 2024 International Fuel Gas Code (IFGC).

Verified 2026-07-05 · Source

When you need this permit

  • Permit required for furnace, air conditioner, and other mechanical equipment installation or replacement
  • Residential air conditioner, water heater, and furnace replacement/installation are billed at a shared flat fee
  • Generators over 5kW require a permit at a flat fee
  • Contractor registration with the Town required; homeowners may self-permit mechanical work only on their own owner-occupied primary residence Owner-builderContractor

Required documents

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Fee schedule

Residential Air Conditioner, Water Heater, and Furnace Replacement/InstallationTown of Castle Rock Development Services Fee Schedule, effective July 1, 2026
$75.00 each
Generator over 5kW
$75.00
Plan Review Fee
65% of the Building Permit Fee (for valuation-based mechanical work not on the flat-fee list)

Review timeline

Plan review
Not published — contact the department

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

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

Inspection process

  1. 1

    Rough-In / Equipment

    Equipment and ductwork installed before concealment

  2. 2

    Final

    Equipment operational, combustion air and venting verified

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

Tips

  • A/C, water heater, and furnace replacement/installation share one flat $75.00 fee line on the Town's fee schedule — confirm which specific equipment swap you're doing maps to this item versus a full valuation-based mechanical permit.

Frequently asked questions

Castle Rock requires a mechanical / hvac permit for: Permit required for furnace, air conditioner, and other mechanical equipment installation or replacement; Residential air conditioner, water heater, and furnace replacement/installation are billed at a shared flat fee; Generators over 5kW require a permit at a flat fee; Contractor registration with the Town required; homeowners may self-permit mechanical work only on their own owner-occupied primary residence. If your project isn't listed, confirm with Town of Castle Rock Development Services, Building Division at 720-733-3527 before starting work.

In Castle Rock, the published Residential Air Conditioner, Water Heater, and Furnace Replacement/Installation is: $75.00 each. Additional published fees: Generator over 5kW — $75.00; Plan Review Fee — 65% of the Building Permit Fee (for valuation-based mechanical work not on the flat-fee list). These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Castle Rock does not publish a plan-review timeline for this permit. Contact Town of Castle Rock Development Services, Building Division at 720-733-3527 for current turnaround.

You'll need: Plan Review and Construction Permit Application (eTRAKiT). See the required-documents checklist on this page for details on each.

Castle Rock requires 2 inspection(s) for a mechanical / hvac permit, in order: Rough-In / Equipment, Final. Schedule each through Town of Castle Rock Development Services, Building Division (720-733-3527).

Apply through Town of Castle Rock Development Services, Building Division at 100 N. Wilcox St., Castle Rock, CO 80104. Phone: 720-733-3527, email: buildingcounter@crgov.com. Office hours: Development Services Building Counter (Town Hall): Monday-Friday, 8 a.m. to 5 p.m. Inspection scheduling line: 303-660-1341.. Official information: https://www.crgov.com/1887/Building.

Castle Rock, Colorado has adopted: The Town of Castle Rock is a home-rule municipality that runs its OWN Building Division — it is a separate prequalified building department from Douglas County (confirmed via the Colorado Division of Fire Prevention and Control's Prequalified Building Departments list, which shows both 'Douglas County' and 'Town of Castle Rock' as distinct entries; Joseph Montoya is the Town of Castle Rock's listed prequalified contact, jmontoya@crgov.com, 720-733-2225). Source: Colorado DFPC Prequalified Building Departments list, https://dfpc.colorado.gov/sites/dfpc/files/Current%20Prequalified%20Building%20Departments.pdf; 2024 International Building Code (IBC), as amended by Ordinance No. 2026-017, adopted by Town Council June 2, 2026, effective June 30, 2026 (amending Castle Rock Municipal Code Title 15, Chapter 15.04); 2024 International Residential Code (IRC) for One- and Two-Family Dwellings, as amended by Ordinance No. 2026-017 (Castle Rock Municipal Code Chapter 15.06); 2024 International Plumbing Code (IPC); 2024 International Mechanical Code (IMC); 2024 International Fuel Gas Code (IFGC); 2024 International Fire Code (IFC), enforced by Castle Rock Fire and Rescue Department; 2024 International Existing Building Code (IEBC); 2024 International Swimming Pool and Spa Code (ISPSC); 2021 International Energy Conservation Code (IECC) — Castle Rock has adopted the 2024 editions of most I-Codes but retains the 2021 IECC rather than a newer edition; 2023 Colorado Model Electric-Ready and Solar-Ready Code, adopted by reference as new Castle Rock Municipal Code Chapter 15.15 via Ordinance No. 2026-017; applies to all new residential and commercial buildings and to additions/substantial remodels requiring a building permit; 2026 National Electrical Code (NEC); 2017 ICC A117.1 Accessible and Usable Buildings and Facilities (Ordinance No. 2026-017 adds a new Section 1102, Compliance, specifying the 2017 edition); 1997 Uniform Code for the Abatement of Dangerous Buildings; ASME A17.1-2022 (Safety Code for Elevators and Escalators), ASME A18.1-2020 (Platform Lifts and Stairway Chairlifts), ASME A17.3-2023 (Existing Elevators and Escalators); 2021 Automated People Mover Standards (ASCE 21, Parts 1-4); 2025 Colorado Wildfire Resiliency Code, effective July 1, 2026 (Castle Rock Municipal Code Chapter 15.20, per Ordinance No. 2026-017 amendments); Source for the full current adopted-code list and effective dates: Town of Castle Rock Adopted Building Codes page, https://www.crgov.com/2178/Adopted-Building-Codes, and Ordinance No. 2026-017 (full amendment text), https://www.crgov.com/ArchiveCenter/ViewFile/Item/2870. Local amendments apply — see the Castle Rock 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 Castle Rock building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.

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