Permit Required? Required
Typical Fee Range $100–$300 Standard flat fee for residential system replacement.
Fee Method Flat fee
Apply Online Apply at Develop Louisville - Office of Construction Review →

What's Required in Louisville

  • Mechanical permit required for all HVAC unit replacements.
  • Manual J load calculations required for new system sizing.
  • Electrical permit required for power connections to the unit.
  • Proper venting and condensate drainage must be installed.
  • Exterior unit must meet property line setbacks.
  • Gas piping permit required if switching from electric to gas heat.

How to Get a HVAC Permit in Louisville

1

Step 1: System Sizing

Perform load calculations to select the correct HVAC unit.

2

Step 2: Submit Application

Apply for mechanical and electrical permits online.

3

Step 3: Installation

Replace the unit and ductwork according to code.

4

Step 4: Safety Check

Ensure all gas and electrical connections are secure.

5

Step 5: Final Inspection

Inspector checks venting, drainage, and safety switches.

Frequently Asked Questions

Yes, any permanent mechanical heating or cooling system requires one.
Yes, for their own primary residence.
A standard residential system replacement permit is roughly $100–$150.