Do you need a permit for an AC unit, heat pump, or generator in Houston, TX?
It depends on the details of your project.
Even repairing or replacing an outdoor condensing unit needs a permit.
A condensing unit permit covers residential and commercial work.
A registered contractor must pull the permit.
A person last checked these rules on October 22, 2026. This is guidance only, so confirm with Houston 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 Houston
| Permit | When it applies |
|---|---|
| Mechanical permit | Houston requires a permit to install, repair or replace a condensing unit. |
| 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.
- Houston has no zoning. Deed restrictions cover a large share of the city and often set fence heights, setbacks and whether a second unit is allowed. Check your subdivision's restrictions (Harris County Clerk records) before you build.
How to apply
- Houston Permitting Center
- Phone: (832) 394-9000
Common questions
- When does an AC unit, heat pump, or generator need a mechanical permit in Houston?
- Houston requires a permit to install, repair or replace a condensing unit. Generators are covered by the electrical permit.
- Where do I apply for an AC unit, heat pump, or generator permit in Houston?
- Apply through Houston Permitting Center, or call (832) 394-9000.
Sources
- Houston Permitting Center, Condensing Unit (Commercial/Residential). Checked 2026-10-22
The City of Houston requires a permit for the installation, repair, or replacement of condensing units.
- Houston Permitting Center, Electrical Vehicle Charging Outlets Permit. Checked 2026-10-22
Registered electrical contractors who wish to install electrical charging outlet must apply for an electrical permit.
- 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…