Do you need a permit for an AC unit, heat pump, or generator in San Jose, CA?
It depends on the details of your project.
AC, furnace, and heat pump permits are available online.
Replacing a furnace needs a mechanical permit.
A standby generator needs an electrical permit for its transfer switch.
A person last checked these rules on October 19, 2026. This is guidance only, so confirm with San Jose 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 San Jose
| Permit | When it applies |
|---|---|
| Mechanical permit | San José issues mechanical permits for AC, furnace, and heat pump work, most of them online. |
| 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
- SJPermits.org
- San Jose Building Division
- Phone: (408) 535-3555
Common questions
- When does an AC unit, heat pump, or generator need a mechanical permit in San Jose?
- San José issues mechanical permits for AC, furnace, and heat pump work, most of them online. Generators are covered by the electrical permit.
- Where do I apply for an AC unit, heat pump, or generator permit in San Jose?
- Apply through SJPermits.org, or call (408) 535-3555.
Sources
- City of San José, Online Building Permits. Checked 2026-10-22
You can download a building permit for 56 types of simple projects at SJPermits.org... [Electrical:] Electric Vehicle Charging Station... [Mechanical:] Air Conditioning... Furnace Replacement... Heat Pump HVAC
- San José Bulletin 201, When Is a Building Permit Required? (10/10/2024), other items. Checked 2026-10-22
Retaining walls not over 4 feet in height measured from the bottom of the footing to the top of the wall and that are not supporting a surcharge... [Driveways and walkways that] do not exceed 30 inches above adjacent grade... Swimming pools that are prefabr…
- 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…