Permit Required? Required
Typical Fee Range $125–$250 A $101.51 base fee plus technology surcharges; applies to individual unit/appliance replacements.
Fee Method Flat rate
Apply Online Apply at City of Austin Development Services Department →

What's Required in Austin

  • A mechanical permit is required for replacing any heating or cooling unit (A/C, furnace, or boiler).
  • Must follow current IECC energy codes for system efficiency, SEER, and EER ratings.
  • Proper secondary drain pans and safety float switches are mandatory for all attic installations.
  • Manual J load calculations are required for new system designs to ensure proper capacity and efficiency.
  • Condenser units must be anchored to a level pad and meet standard property line setbacks.
  • Must be performed by a licensed Mechanical contractor registered with the City of Austin.

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

Yes. Austin 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 $125–$250, and the permit is issued by the City of Austin Development Services Department. 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 City of Austin Development Services Department before work starts; it's a five-minute call.

How to Get a HVAC Permit in Austin

1

Step 1: Equipment Sizing

Perform Manual J calculations to select a unit appropriate for Austin's climate and home insulation.

2

Step 2: Portal Application

Submit a 'Mechanical Change Out' permit application via the Austin Build + Connect (AB+C) portal.

3

Step 3: Fee Payment

Pay the flat permit fee ($125 minimum typical) through the online payment system.

4

Step 4: Installation

Install the unit ensuring all safety switches, pans, and vents meet the 2024 Mechanical Code standards.

5

Step 5: Inspection Scheduling

Schedule a final mechanical inspection via the AB+C portal to close the permit.

Frequently Asked Questions

Standard residential replacement permits typically cost between $125 and $250 total.
Yes, all residential heating and cooling unit replacements require a mechanical permit.
Yes, as an owner-occupant, you can pull a permit, but you must still pass a final mechanical inspection.
Adding or altering ductwork is mechanical work that typically requires a permit in Austin. Confirm the scope with the City of Austin Development Services Department before starting.