The City of Marietta's zoning code, as published, defines an accessory dwelling unit as a secondary, independent dwelling on the same lot as a detached single-family home, attached or detached, and located to the rear of the main structure. Which districts allow one, and the size limits, come from other sections of the code, which we confirm with the city for each parcel, as of October 2026.
Is Marietta the same as Cobb County?
No. Marietta is a city with its own zoning ordinance and its own planning staff. Many addresses with a Marietta mailing address are in unincorporated Cobb County, which has separate rules. The first thing we check is which government your parcel answers to.
What does "to the rear" mean for my design?
The definition puts the ADU behind the main house, whether attached or detached. That rules out a unit placed beside or in front of the house and means a rear-yard addition or cottage is the typical layout. On corner lots and odd-shaped parcels, which side counts as the rear can need a zoning interpretation, which we ask for in writing.
Does the ADU need a full kitchen?
Marietta's code defines a dwelling unit as including permanently installed, complete kitchen facilities. A space without them is not a dwelling unit under that definition. If you want a guest suite without a kitchen, it may be permitted as part of the house instead.
What usually matters on a Marietta lot?
- Historic areas. Neighborhoods near the Square include historic districts where design review can apply.
- Mid-century ranch houses. Electrical service and sewer lines often need upgrades to serve a second unit.
- Covenants. Newer subdivisions often have HOA restrictions that go further than zoning.