1-Story Barndominium in Georgia

Per square foot, usually not, and the reason is worth understanding before you decide. Roof and foundation both scale with footprint rather than with finished area, and a single storey needs roughly twice the footprint for the same square footage. In NAHB's 2024 national cost-of-construction survey, foundation work came to 10.0% of total construction cost and framing and roof to 11.6% — about 21.6% between them, all of it footprint-driven. Split across two floors, that share per square foot falls. What comes back the other way is real too: no stair taking floor area out of both levels, no second-floor structural system, no taller wall assemblies or scaffolding, and one mechanical run instead of two. We do not publish a percentage for the net, because no barndominium-specific study segmented by storey count exists and the figures circulating online have no primary source behind them.

In most of Georgia, no, and this is the single most common surprise on a single-level plan. Jackson County's Unified Development Code defines building floor area as the gross floor area of heated spaces and says expressly that heated floor area does not include garages, unheated basements, attic storage or partially enclosed decks and patios. Its barndominium standard then requires 1,400 sq ft of that heated area. Newton, Paulding and Bartow are written the same way, around heated living area. So a 2,400 sq ft building with a 1,200 sq ft unheated shop is a 1,200 sq ft house as far as the ordinance is concerned. If you want the shop to count, it has to be conditioned, and that changes the envelope and the mechanical design. We confirm the definition your county uses before the split is fixed.

Because some jurisdictions write the minimum around what the building presents from the street rather than around total size, and a two-storey house reaches that presence on a smaller footprint. The City of South Fulton is the clearest case in Georgia. Its zoning ordinance sets AG-1 and R-1 at 1,800 sq ft on the ground floor for anything under two storeys, but 2,000 sq ft total with only 1,200 on the ground floor at two storeys or more. R-2 is 1,600 against 1,050, R-2A 1,700 against 1,050, R-3 1,200 against 900. Nothing in the ordinance explains the reasoning, so we will not put words in it, but the effect is unambiguous: on those parcels a modest single-level plan is the harder one to get approved. It is worth checking your own district table before assuming one storey is the simpler route.

It is the configuration that gets there first, since the whole building sits on the ground. The caps in our counties range widely: Cherokee 20% in AG, Macon-Bibb 25% in both its A and RR districts, Sandy Springs 25% in RE-2 and RE-1, Hall 35% in AG-1 and AR-1. Newton, Walton and Coweta cap impervious surface instead, at 15%, which is stricter than it sounds because the driveway, the turnaround and the concrete apron in front of the shop doors all count. Athens-Clarke's 10% in AR is the number that reads worst and matters least, because AR requires a ten-acre lot and 10% of ten acres is more footprint than anyone is building. Sandy Springs deserves the closest look: a 35% minimum canopy coverage applies to the same lot as the 25% cap, and together they shape the building more than the setbacks do.

No. IRC R301.1.1 lets a house be built to the prescriptive provisions of one of three standards — the AWC Wood Frame Construction Manual, AISI S230 for cold-formed steel, or ICC 400 for log structures. A clear-span rigid frame or a post-frame building matches none of them, so R301.1.3 applies and those elements are designed to accepted engineering practice. That is true on one level and on two. Three Georgia counties now say so in their own documents: Carroll County publishes a barndominium requirements sheet stating it has required a Professional Engineer letter of approval for all inspections on barndominium homes since 1 August 2021, Walton County's residential building packet says stamped engineered plans are required for all barndominiums, and Jackson County writes the building type into its code as its own use class. None of them carve out an exception for a single storey. What one level does buy you is a simpler thing to engineer, not a way around it.

Often not, and this is where we would rather talk you out of it. A single storey needs the widest flat pad of any configuration, and on Georgia Piedmont red clay a wider pad on sloping ground means disproportionately more cut and fill, because the depth of cut at the uphill edge grows with the width as well as with the area. Rock near the surface makes it worse and is common in the rolling ground across Jackson and the north-east counties. Meanwhile the same slope that is costing you money is the condition a walkout basement needs, and on a North Georgia lot that lower level is frequently the cheapest conditioned square footage in the building. There is a permit dimension too: Coweta requires a site preparation permit before any grading, Dawson requires a land disturbance permit for all land disturbance other than agricultural activity, and Carroll requires matting on any slope of 3:1 or steeper. On genuinely flat ground the single-storey argument is strong. On a slope it is worth pricing against a walkout before you decide.