What is an ADU and can I add one to a Marietta home?

An accessory dwelling unit, or ADU, is a smaller secondary living space on the same lot as a main home, either attached, detached or converted from existing space like a garage. Adding one to a Marietta property is possible on many lots, subject to Cobb County or city zoning rules covering lot size, setbacks and utility connections. Not every parcel qualifies, so checking your specific lot's zoning before planning the project matters. Ask the Marietta or Cobb County building department to confirm what your property allows.