What's Required in Cincinnati
- HVAC permit for every new installation or replacement of furnaces, air conditioners, heat pumps, boilers, fireplaces and duct re-work.
- No permit for window air conditioners, duct extensions in one- to three-family additions, or replacement of parts that do not alter the equipment's approval.
- No separate IBI electrical permit for replacement furnaces, boilers, heat pumps or AC on existing branch circuits in one- to three-family homes; IBI permit for any new circuit.
- OCILB-licensed HVAC contractor registered with the city ($131.25 per year, state license on file); owner-occupant exception to confirm with the Permit Center.
- HVAC/Mechanical Permit Application with equipment size, type, location, venting and combustion air; four copies of plans for new installations.
- Replacement applications online through ezTrak, without the $49 processing fee; new installations pay the processing fee at application.
- Inspection by Building Construction Inspections with 24 hours notice; permit expires after one year without a start or inspection.
Do you need a permit to replace a furnace or air conditioner in Cincinnati?
Yes, even like for like. The department's HVAC handout says permits are required for all new installations, replacement units, pre-fab fireplaces, wood-burning stoves, furnace add-ons, metal chimney alterations, duct re-work and related mechanical devices, and its Mechanical Inspections page repeats that heating, ventilating, air conditioning and fuel-burning devices require permits for installation or replacement. Two things are exempt by the same handout: window air conditioners and duct extensions in additions to one-, two- and three-family homes. The Residential Code of Ohio also exempts portable heaters and coolers and the replacement of any part that does not alter the equipment's approval, so a blower motor or capacitor is a repair, not a permit.
The good news for a straight swap: Cincinnati Building Code 1101-17.4 waives the separate electrical permit for replacement gas or oil furnaces and boilers, heat pumps and air conditioning equipment connected to existing branch circuits in one- to three-family dwellings. Run a new circuit, or add equipment that needs one, and IBI's electrical permit is back.
How much does a Cincinnati HVAC permit cost?
The fee schedule effective July 1, 2026 has a flat line for HVAC replacement in Residential Code of Ohio projects: replace equipment or connect to an existing branch, $118 for the first unit and $48 for each additional unit; connect new equipment to a new branch circuit, $93 for the first unit; a combination, $118 plus $48. Replacement applications without plans skip the $49 processing fee. Five surcharges then apply (3% technology, 1% training, 1% financial recovery, 5% planning, 1% state), about $11 per $100, so a furnace alone is $118 plus about $13, roughly $131, and a furnace-and-condenser swap is $118 + $48 = $166, roughly $184.
A new system, or a first-time installation such as adding central air to a house that never had it, is priced by valuation in the new RCO installations column: $102 at $2,000, $249 at $5,000, $369 at $8,000, $450 at $10,000, $618 at $15,000, plus the $49 processing fee because plans are submitted. A $10,000 new system is $450 + $49 = $499, about $554 with surcharges. If the electrician runs a new circuit, IBI charges $60 processing plus $45 for heating and cooling with altered wiring at a single-family house (pre-calculated $95.95 to $106.05 for unit replacements).
| What you are doing | City filing | Rule |
|---|---|---|
| Window air conditioner | No permit | HVAC handout exemption |
| Blower motor, capacitor, thermostat on existing wiring | No permit | RCO 102.10: replacement of any part that does not alter approval |
| Replace a furnace on the existing gas line and circuit | HVAC permit about $131 | $118 first unit + surcharges; no processing fee; no IBI permit (CBC 1101-17.4 exception) |
| Replace furnace and AC condenser together | HVAC permit about $184 | $118 + $48 second unit + surcharges |
| Ductless mini-split on a new circuit | HVAC permit about $103 + IBI about $105 | $93 new-branch line + surcharges; IBI $60 + $45 wiring altered |
| New central air added to a home, $5,000 | HVAC permit about $331 | $249 new installation + $49 processing + surcharges |
| Whole new system with ductwork, $10,000 | HVAC permit about $554 | $450 + $49 + surcharges |
How to apply and what to submit
Replacements can be filed online: the department's forms page offers Apply Online for HVAC replacements only, and ezTrak lists mechanical permits among the permits it issues. Anything else uses the HVAC/Mechanical Permit Application with four copies of plans showing equipment size, type and location, vents, flues and combustion air, and duct layouts, though one- to three-family homes skip the duct layouts and ventilation calculations and complete the back of the form instead. Mechanical permits fall under Tier 2 review, targeted at 5 workdays. Inspections come from Building Construction Inspections at 513-352-3267 with 24 hours notice, and the permit expires if the work has not started or been inspected within a year.
Who can do the work
Cincinnati Building Code 1106-5 restricts permit work in the HVAC, refrigeration and hydronics trades, as licensed by the Ohio Construction Industry Licensing Board, to OCILB-licensed contractors registered with the city ($131.25 a year, with a copy of the state license). The same chapter's homeowner exception lets an owner of a one- to three-family dwelling who will occupy it for a year perform work personally; the HVAC handout does not say whether the department issues a mechanical permit to an owner, so ask the Permit Center at 513-352-3271 before buying equipment. Working without a permit adds an investigation fee equal to the permit fee.
How to Get a HVAC Permit in Cincinnati
Confirm the scope
A swap on the existing gas line and circuit is a replacement; a new circuit, new equipment location or new ductwork is a new installation with plans.
Hire a registered OCILB contractor
Verify the HVAC company's OCILB license and city registration on the registered contractor list.
File the permit
Replacements: apply online in ezTrak and pay $118 per first unit plus surcharges. New systems: submit the HVAC application and four sets of plans with the $49 processing fee.
Pull IBI electrical if wiring changes
A new branch circuit for a condenser, mini-split or air handler needs a separate IBI permit filed through ezTrak.
Install and inspect
Schedule Building Construction Inspections at 513-352-3267 with 24 hours notice; IBI inspects any new wiring separately.