Do I need a permit for hvac replacement or installation in Naperville?
It depends. Whether hvac replacement or installation needs a permit in Naperville comes down to the details of your project.
Naperville requires a permit for a new furnace or air conditioning unit, but does not require a permit for an in-kind replacement of an existing furnace or A/C. A permit is also required for an air conditioner or water softener listed as new equipment. Naperville adopts and amends the ICC codes (the 2024 International Mechanical Code and Fuel Gas Code take effect April 1, 2026), so new equipment must meet current code even for a like-for-like swap. If the change involves any electrical or gas alterations beyond a straightforward replacement, additional trade permits and a registered contractor may be required. Confirm scope with the TED Business Group at (630) 420-6100, Option 2. Most Illinois jurisdictions require a mechanical permit to replace a furnace, air conditioner or heat pump, even for a like-for-like changeout. Gas piping, venting and any new electrical circuit normally require their own trade permit, inspection and pressure test. Which code edition applies is set by your municipality or county, because Illinois has no statewide residential building code for work on an existing home.
Documents you may need
- Building (mechanical) permit application through the City's Civic Access permit portalSometimes required
- Equipment specifications for the new furnace or air conditionerSometimes required
- Development Petition and Disclosure of Beneficiaries formsSometimes required
- Equipment spec sheet (size/BTU, efficiency)required
- Contractor license and insurance informationLikely required
- Load calculation for a changeout of different capacitySometimes required
Possible inspections
- Mechanical inspection of permitted HVAC work by the TED Business Group (when installing a new system)
- Mechanical rough inspection
- Final inspection
Frequently asked questions
- Do I need a permit for hvac replacement or installation in Naperville?
- It depends. Whether hvac replacement or installation needs a permit in Naperville comes down to the details of your project. Naperville requires a permit for a new furnace or air conditioning unit, but does not require a permit for an in-kind replacement of an existing furnace or A/C. A permit is also required for an air conditioner or water softener listed as new equipment. Naperville adopts and amends the ICC codes (the 2024 International Mechanical Code and Fuel Gas Code take effect April 1, 2026), so new equipment must meet current code even for a like-for-like swap. If the change involves any electrical or gas alterations beyond a straightforward replacement, additional trade permits and a registered contractor may be required. Confirm scope with the TED Business Group at (630) 420-6100, Option 2. Most Illinois jurisdictions require a mechanical permit to replace a furnace, air conditioner or heat pump, even for a like-for-like changeout. Gas piping, venting and any new electrical circuit normally require their own trade permit, inspection and pressure test. Which code edition applies is set by your municipality or county, because Illinois has no statewide residential building code for work on an existing home.
- Who issues the permit in Naperville?
- The local building department for Naperville handles permitting. This page lists its contact details and online portal. Your mailing city is not always the permitting authority, so confirm the jurisdiction before you apply.
- How do I find out the exact requirements for my project?
- Run the free PermitRoadmap check for your specific project and answers. It returns the likely permits, documents, inspections, and next steps, each linked to its official source.
PermitRoadmap is an independent informational service and is not affiliated with any city, county, state agency, or permitting authority. Results are informational and do not replace confirming requirements with the local permitting authority.