In Georgia, What the legality to renting out ADU (or guesthouse)?

[Wilson Zu]

In some estate in the West such as CA, WA, there are specific rules and overall, it is allowed to rent out a guesthouse (or ADU - Accessory Dwelling Units). Often, the ADU is converted from a garage and rented out as a separate unit.

What is the legality to renting out ADU's or guesthouse or basement as a separate unit from a SFR in Georgia? Particularly in the Atlanta metro area such as Fulton, Cobb, Forsyth? Know anybody who had done this? How the utility is handled? Appreciate your feedback.