Chicago HVAC Permit

What's Required in Chicago

• A permit is required for any replacement of a furnace, air conditioner, or boiler.
• Manual J and Manual S load calculations are required for new system sizing.
• Must comply with current Chicago Energy Transformation Code (Cooling/Heating efficiencies).
• Gas lines must be pressure tested and inspected if the unit is moved or resized.
• Proper venting/chimney liner must be verified for high-efficiency furnace conversions.
• Must be performed by a licensed Mechanical/HVAC contractor.

Do You Need a Permit to Replace an AC or Furnace in Chicago?

Yes. Chicago treats HVAC replacement as permit-required work, and that includes the common case people hope is exempt: a like-for-like swap of a furnace, AC condenser, or heat pump in the same location. Permit fees typically run $1,800 (Base MEP), and the permit is issued by the Chicago Department of Buildings. In practice your HVAC contractor pulls it as part of the job — if a bid doesn't mention the permit, ask why, because unpermitted mechanical work surfaces at home sale time and in insurance claims.

HVAC Repairs vs. Replacement: Where the Permit Line Falls

The line falls at equipment, not maintenance. Repairs that keep an existing system running — a blower motor, capacitor, control board, or a thermostat swap on existing wiring — generally don't need a permit. Replacing the equipment itself, adding or reworking ductwork, or running new gas or electrical almost always does. Refrigerant-line and coil replacements sit in the gray zone and vary by city. When the scope is unclear, describe the exact job to the Chicago Department of Buildings before work starts; it's a five-minute call.

How to Get a HVAC Permit in Chicago

Frequently Asked Questions