Do you need a permit for an AC unit, heat pump, or generator in Denver, CO?
It depends on the details of your project.
AC and heat pump work uses a quick permit with no plan review.
Quick permits need no plan review.
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 Denver 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 Denver
| Permit | When it applies |
|---|---|
| Mechanical quick permit | Denver issues quick permits for residential AC and heat pump installs and replacements. |
| 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
- Denver e-permits (Accela)
- Single-family and duplex projects
- Denver zoning map
- Denver Zoning Code
- Phone: 311 (720-913-1311)
Common questions
- When does an AC unit, heat pump, or generator need a mechanical permit in Denver?
- Denver issues quick permits for residential AC and heat pump installs and replacements. Generators are covered by the electrical permit.
- Where do I apply for an AC unit, heat pump, or generator permit in Denver?
- Apply through Denver e-permits (Accela), or call 311 (720-913-1311).
Sources
- Denver CPD, Quick Permits. Checked 2026-10-22
Quick permits are trad[e]-specific permits that can be issued without the need for a plan review... [Electrical quick permits include] Electric vehicle chargers... Solar PV systems... [Boiler and A/C quick permits include] Residential A/C... Split system AC…
- 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…