Do you need a permit for an AC unit, heat pump, or generator in Austin, TX?
It depends on the details of your project.
A like-for-like HVAC change-out still needs a mechanical permit.
Austin's exempt list covers only minor parts and portable units.
A standby generator needs an electrical permit for its transfer switch.
A person last checked these rules on October 22, 2026. This is guidance only, so confirm with Austin before you build.
Check your exact lot
Your zoning district sets the setbacks, and a flood zone can change the permit answer. Enter your address to see both.
Permits a AC unit, heat pump, or generator can need in Austin
| Permit | When it applies |
|---|---|
| Mechanical permit | Austin issues mechanical permits for new HVAC systems and like-for-like change-outs. Its exempt list covers only minor parts and portable units.Medium confidence |
| Electrical permit | A standby generator needs an electrical permit for its transfer switch. A new outdoor unit needs a new circuit and disconnect.Medium confidence |
| Gas piping permit | A gas or propane line to the equipment needs a fuel-gas permit.Medium confidence |
Local details
- Call 811 at least a few days before you dig footings or post holes. Utility locating is free.
- HOA covenants and deed restrictions can be stricter than city rules. Check yours before you build.
How to apply
- Austin Build + Connect (AB+C)
- Work exempt from building permits
- City and Land Development Code
- Phone: 311 (512-974-2000)
Common questions
- When does an AC unit, heat pump, or generator need a mechanical permit in Austin?
- Austin issues mechanical permits for new HVAC systems and like-for-like change-outs. Its exempt list covers only minor parts and portable units. Generators are covered by the electrical permit.
- Where do I apply for an AC unit, heat pump, or generator permit in Austin?
- Apply through Austin Build + Connect (AB+C), or call 311 (512-974-2000).
Sources
- City of Austin, Mechanical Permit Request (5/13/21). Checked 2026-10-22
[The form asks whether the work is a like-for-like HVAC unit replacement and how many units.] If you are a part of the Change-Out Program for Heating, Ventilation and AC System, please use new change-out form.
- City of Austin, Work Exempt from Building Permits (residential items). Checked 2026-10-22
Unless supporting a surcharge or located within a flood hazard, a retaining wall that is not over 4 feet (1,219 mm) in height measured from the bottom of the footing to the top of the wall... A sidewalk, driveway, or concrete flatwork that is not located in…
- 2024 IRC R105.2, Work exempt from permit (text published by the City of Benson, AZ). Checked 2026-10-19
One-story detached accessory structures, provided that the floor area does not exceed 200 square feet. Fences not over 7 feet high. Decks not exceeding 200 square feet in area, that are not more than 30 inches above grade at any point, are not attached to a…