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Mechanical / HVAC Permit in Louisville, Colorado

Required for heating, cooling, and ventilation equipment installation or replacement in Louisville, including A/C units, furnaces, boilers, and water heaters. Governed by the 2024 International Mechanical Code (IMC).

Verified 2026-07-05 · Source

When you need this permit

  • Governed by the 2024 IMC as adopted (effective 12/6/2025)
  • MEP - Single Trade: A/C, Furnace/Boiler, Water Heater, and Minor Mechanical are classified as Minor Permits for review-timeline purposes
  • New outdoor A/C unit installations must comply with the local NEC 210.8(F) Exception #2 GFCI amendment effective 9/1/2026
  • Mechanical contractors require a Journeyman Mechanical G31 (2018 edition) or Master Mechanical G29 ICC test result, plus a City of Louisville Contractor License Contractor
  • The Building Department will not conduct furnace, A/C, or water heater inspections with the property owner present per city policy — a licensed contractor must be involved Contractor

Required documents

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Fee schedule

Permit fee — valuation-based (Building Permit Fee Table)Table 4, CC 12/03/24
$28.00 minimum, scaling per valuation tiers
In-House Plan Review Fee
65% of the permit fee (only if plan review is required)
Boulder County Use Tax
1.185% of 50% of Total Valuation
City of Louisville Use Tax
3.775% of 50% of Total Valuation

Review timeline

Plan reviewLouisville’s published plan-review target
1–2 business days

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

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 installed but not yet concealed

  2. 2

    Final Inspection

    Equipment operational, combustion air and venting verified

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

Tips

  • Furnace, A/C, and water heater replacements are each individually listed as Minor Permits with a fast 1-2 business day review — but the City will NOT perform these inspections with only the property owner present; a licensed contractor must coordinate the inspection. Contractor
  • Mechanical contractors need a specific ICC Journeyman Mechanical G31 (2018) or Master Mechanical G29 test result — this is stricter/more specific than many peer jurisdictions that only require a state license.

Frequently asked questions

Yes. 'Furnace/Boiler' replacement is explicitly listed as a Minor Permit (MEP - Single Trade) on the City's permit review-time table, typically reviewed within 1-2 business days.

In Louisville, the published Permit fee — valuation-based (Building Permit Fee Table) is: $28.00 minimum, scaling per valuation tiers. Additional published fees: In-House Plan Review Fee — 65% of the permit fee (only if plan review is required); Boulder County Use Tax — 1.185% of 50% of Total Valuation; City of Louisville Use Tax — 3.775% of 50% of Total Valuation. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Louisville's published plan-review target for a mechanical / hvac permit is 1–2 business days.

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

Louisville requires 2 inspection(s) for a mechanical / hvac permit, in order: Rough Mechanical, Final Inspection. Schedule each through City of Louisville Building Safety Division ((303) 335-4584).

Apply through City of Louisville Building Safety Division at City Hall, 749 Main St, Louisville, CO 80027. Phone: (303) 335-4584, email: building@louisvilleco.gov. Office hours: Monday-Thursday 8AM-4PM (in-person; remote 4PM-5PM); Friday 8AM-5PM remote/by appointment only; Tuesday 11AM-12PM limited staff availability (staff meeting). Inspection hours Monday-Friday 6:30AM-5PM.. Official information: https://www.louisvilleco.gov/local-government/government/departments/building-safety.

Louisville, Colorado has adopted: 2024 International Building Code (IBC), effective 12/6/2025 — City of Louisville Building Codes page; 2024 International Residential Code (IRC), effective 12/6/2025; 2024 International Energy Conservation Code (IECC), effective 12/6/2025; 2024 International Fire Code (IFC), effective 12/6/2025; 2024 International Plumbing Code (IPC), effective 12/6/2025; 2024 International Fuel Gas Code (IFGC), effective 12/6/2025; 2024 International Mechanical Code (IMC), effective 12/6/2025; 2024 International Existing Building Code (IEBC), effective 12/6/2025; 2024 International Property Maintenance Code (IPMC), effective 12/6/2025; 2023 National Electrical Code (NEC), effective 1/5/2024; local amendment NEC 210.8(F) Exception #2 takes effect 9/1/2026 requiring GFCI protection on all new outdoor A/C units; 1997 Uniform Code for the Abatement of Dangerous Buildings, effective 12/6/2025; 1997 Uniform Housing Code, effective 12/6/2025; Colorado Model Electric Ready and Solar Ready Code, effective 12/6/2025; Louisville Fire Hardening Code — Ordinance 1884 (series 2024), updated by Ordinance 1891 (series 2025) and Emergency Ordinance 1913 (series 2026, effective 1/21/2026) — sets minimum fire-resistant construction standards for new construction, accessory structures, and repair/replacement of specific home systems (roofing, siding, decks, fencing, vents, gutters) to reduce wildfire spread risk; applies citywide, not limited to a mapped WUI zone; Louisville Municipal Code Chapter 15 — Buildings and Construction (local amendments and adoption-by-reference); Louisville Municipal Code Chapter 5.12 (Section 5.12.090) — Contractor Licensing: any contractor employed on a building project must be licensed with the City of Louisville and listed on the permit; Prior to 12/6/2025 the City operated under the 2018 ICC codes; the 2024 ICC code adoption ordinance and effective date are confirmed on the City's Building Codes page. Local amendments apply — see the Louisville 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 Louisville 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

Alamosa, ColoradoArvada, ColoradoAspen, ColoradoAult, ColoradoAurora, ColoradoAvon, ColoradoBasalt, ColoradoBennett, Colorado

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