Alpharetta, GA Accessory Structures: ADU Rules (2026)

Section 2.2.12 of the Unified Development Code permits a live-work accessory dwelling in the O-P office-professional district under four specific conditions. The unit must sit above or to the rear of the commercial or office structure it serves and be attached to that structure by a common wall, so a freestanding cottage or detached garage apartment does not qualify. Occupancy is restricted to a single family that includes the owner or a tenant of the attached commercial or office space, meaning the dwelling cannot be rented out separately to someone unconnected to the business below.

Size is capped at 40% of the combined square footage of the commercial or office structure and the dwelling together, so a larger office building supports a proportionally larger unit while a small office limits the apartment to a modest footprint. The dwelling and the structure it accompanies must also meet all applicable life safety code, building code and other standard City code requirements before occupancy. Because the O-P district's own accessory-use list is the only place this specific 'For-Sale' accessory dwelling appears in the standard zoning districts, it functions as Alpharetta's version of an accessory dwelling unit tied to office and small commercial development, rather than a garage apartment allowed behind an ordinary single-family home.

Community Development reviews compliance with the attachment, occupancy and size conditions as part of the building permit and certificate of occupancy process for the office property.