Do you need a permit for an AC unit, heat pump, or generator in Phoenix, AZ?
It depends on the details of your project.
In-kind replacement of an outdoor AC unit up to 5 tons needs no permit.
Replacing indoor refrigeration equipment needs a permit.
Heat pumps and mini-splits need a mechanical permit.
A person last checked these rules on October 19, 2026. This is guidance only, so confirm with Phoenix 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 Phoenix
| Permit | When it applies |
|---|---|
| Mechanical permit | New systems, heat pumps, and mini-splits need a mechanical permit in Phoenix. So does replacing any refrigeration equipment inside the house.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
- Phoenix SHAPE PHX permits
- Phoenix Planning & Development
- Phoenix Zoning Ordinance
- Phone: (602) 262-7811
Common questions
- When does an AC unit, heat pump, or generator need a mechanical permit in Phoenix?
- New systems, heat pumps, and mini-splits need a mechanical permit in Phoenix. So does replacing any refrigeration equipment inside the house. Phoenix exempts in-kind replacement of an outdoor AC unit up to 5 tons. If you also replace the indoor coil or air handler, you need a permit.
- Where do I apply for an AC unit, heat pump, or generator permit in Phoenix?
- Apply through Phoenix SHAPE PHX permits, or call (602) 262-7811.
Sources
- Phoenix Building Construction Code 2024, Sec. 105.1 and 105.2 (other items). Checked 2026-10-22
Retaining walls that are not over [4 feet / 40 inches; the amended text shows both] in height... unless supporting a surcharge... Interior and exterior platforms, sidewalks and driveways not more than 30 inches (762 mm) above adjacent grade... Prefabricated…
- 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…