Feasibility first
- Floor structure: attic joists sized for storage are not the same as floor joists sized for living space — reinforcement or new structure may be needed
- Stairs: a legal stair needs headroom and footprint that pull-down stairs never provide
- Headroom and dormers: ceiling height rules decide how much of the floor counts as living space; a dormer can change the maths and the exterior look
- Egress: a sleeping room needs an emergency escape opening to code
Heat, ventilation and comfort
An attic room sits against a Georgia roof deck. Insulation, ventilation and a real HVAC plan (load calculation, not a guess) decide whether the room is comfortable in August. Signs a conversion needs better ventilation — stuffiness, temperature swings, shingle wear above — are worth diagnosing before finishes go in.
Best uses
Teen bedrooms, a quiet home office, or a guest suite paired with a bathroom. For multigenerational living, a terrace-level in-law suite usually beats stairs — we will say so if that is your situation.
Permits, code and the January 2026 code change
An attic conversion is permitted work, and it is now designed to Georgia's current code: the 2024 International Residential Code with Georgia amendments, in force since January 1, 2026, while energy requirements stay on the 2015 IECC with Georgia amendments. That affects insulation, stair and guard details, and the smoke and carbon monoxide alarms a new sleeping room triggers elsewhere in the house — details an older Marietta conversion, done without permits, often gets wrong.
We confirm which office permits your address — City of Marietta through SagesGov inside city limits, Cobb County for unincorporated addresses — before design work starts.