When does an AC unit, heat pump, or generator need a mechanical permit in Atlanta?

Atlanta requires a trade permit to install, repair or replace any HVAC equipment. The building code does exempt repair or replacement of an existing AC condenser at a house, but the city's permit guidance doesn't, so SetbackIQ follows the stricter reading. Ask the Trade Permits Division about a like-for-like condenser swap.

Where do I apply for an AC unit, heat pump, or generator permit in Atlanta?

Apply through Accela Citizen Access (Atlanta), or call (404) 330-6150.

Do you need a permit for an AC unit, heat pump, or generator in Atlanta, GA?

It depends on the details of your project.

Atlanta's code exempts repair or replacement of an existing AC condenser at a house, but ATL311 says any HVAC equipment replacement needs a permit.

Generators, pool equipment and HVAC equipment may sit in a required yard only if they stay within 44 in of the ground.

Window air conditioners may project at most 20 in into a required yard.

A person last checked these rules on October 22, 2026. This is guidance only, so confirm with Atlanta before you build.

Permits a AC unit, heat pump, or generator can need in Atlanta

Permit	When it applies
Mechanical (HVAC) permit	Atlanta requires a trade permit to install, repair or replace any HVAC equipment. The building code does exempt repair or replacement of an existing AC condenser at a house, but the city's permit guidance doesn't, so SetbackIQ follows the stricter reading. Ask the Trade Permits Division about a like-for-like condenser swap.Medium confidence
Electrical permit	Atlanta requires a trade permit to install any electrical equipment: a standby generator's transfer switch, or the new circuit and disconnect for a new outdoor unit.
Gas piping permit	Atlanta requires a trade permit to install plumbing and HVAC equipment, including a gas or propane line to the unit.Medium confidence
Certificate of appropriateness (Urban Design Commission)	In a Landmark or Historic District, or on a landmark or historic building or site, erecting a new structure or changing the exterior needs a certificate of appropriateness from the Urban Design Commission (Zoning Ordinance § 16-20.007), and the building code's permit exemptions don't apply. Conservation Districts need Commission review and written recommendations instead of a certificate.

Limits that apply citywide

Equipment in a required yard	Up to 44 in above grade (HVAC, generators, pool equipment)
Window or wall AC units	May project up to 20 in into a required yard

Local details

Taller equipment must sit outside the required yards, in the buildable area.
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

Common questions

When does an AC unit, heat pump, or generator need a mechanical permit in Atlanta?: Atlanta requires a trade permit to install, repair or replace any HVAC equipment. The building code does exempt repair or replacement of an existing AC condenser at a house, but the city's permit guidance doesn't, so SetbackIQ follows the stricter reading. Ask the Trade Permits Division about a like-for-like condenser swap.
Where do I apply for an AC unit, heat pump, or generator permit in Atlanta?: Apply through Accela Citizen Access (Atlanta), or call (404) 330-6150.

Sources

ATL311, Office of Buildings – Electrical, HVAC or Plumbing Permits (updated August 25, 2026). Checked 2026-10-22
A permit is required to install, repair or replace any electrical, plumbing or HVAC equipment.
Atlanta Code of Ordinances, Appendix A (Building Code Amendments), §§ 103.1 When required and 103.4 Work exempt from permit (Municode). Checked 2026-10-22
It shall be unlawful to construct, erect, demolish, install, alter or repair... any building, structure, equipment, appliances or system without first obtaining a building permit... unless said structure is specifically exempted by this Code... No permit or…
Atlanta Office of Buildings, Work Exempt from a Permit (v3.22). Checked 2026-10-22
In accordance with Ordinance 17-0-1307 the following items are exempt from being permitted... Non-structural porch or deck repairs... Repair or replacement of existing air conditioner condensers... Repair or replacement of existing electrical outlets
Atlanta Zoning Ordinance § 16-20.007, Certificates of appropriateness; generally (Municode). Checked 2026-10-23
(a) When Required, Generally: In addition to other permits which are required pursuant to any city ordinance... certificates of appropriateness shall... be required for any of the following actions... (3) Landmark Districts: a. To change the exterior appear…
Atlanta Zoning Ordinance § 16-28.008(1) and (7), projections and paving in required yards (Municode). Checked 2026-10-22
Eaves... energy generation devices... window or similarly affixed air conditioners... may project not more than 20 inches into any required yard... Maximum width of driveways for one- and two-family uses shall be limited to 20 feet... Paved area in such dri…