A 30x50 barndominium gives you 1,500 square feet, the extra ten feet of length over a 30x40 turning a tight two-bedroom into a more relaxed layout with room to spare. It is a sweet spot for people who want a real home without paying for width they will not use. As with every size, the all-in cost depends far more on your land and site than on the shell, a point we lay out in detail in our cost guide.
The 30-foot width keeps the structure simple and the roof span economical, while the 50-foot length adds a full bay of usable space. That combination is why 1,500 square feet often feels like the most house you can get for the least structural cost.
What 1,500 square feet gives you
- A three-bedroom layout, or two bedrooms plus a study
- Two full bathrooms without crowding the floor plan
- A defined dining area separate from the living room
- A proper laundry and pantry rather than closets
- Optional mudroom or entry near the main door
The added length is what lets a 30x50 carry a third bedroom or a dedicated office that a 30x40 cannot fit comfortably. You are still on one level, which keeps construction simple and avoids the cost of stairs and a second floor.
Where your money goes
Stretching the footprint by ten feet adds slab, roof, and a bit more wall, but those are modest increases. The finishes inside that extra bay are what actually move your budget, because flooring, cabinetry, and trim all scale with the space you finish.
- Slab and shell grow only slightly versus a 30x40
- Interior finish costs rise with the added room
- Plumbing cost depends on whether you add a second full bath
- HVAC sizing steps up modestly for the larger volume
- Site and land remain the wild card in either direction
Budget versus high-end
Finished simply, a 30x50 can be a clean, durable home with standard materials throughout. Finished at a high level, the same footprint supports vaulted ceilings over the living area, custom kitchen work, and upgraded baths. The footprint sets the ceiling on size; your finish choices set the price within it.
If you are comparing what the building alone runs, our kit price guide covers the shell, and your local county page covers the site costs that surround it. Both halves matter before you can trust any all-in number.
Frequently asked: 30x50 barndominiums
- Is a 30x50 barndominium big enough for a family?
- For a small family, yes. At 1,500 square feet you can lay out three bedrooms and two baths comfortably, which suits a couple with one or two kids. Larger families or anyone wanting a workshop usually look at a wider footprint.
- How much more does a 30x50 cost than a 30x40?
- The structural increase is modest because you are only adding length, not a wider roof span. The bigger driver is finishing the extra 300 square feet, so the gap depends mostly on your finish level rather than the shell.
- Can a 30x50 barndominium have an open floor plan?
- Yes. The 50-foot length is well suited to an open kitchen, dining, and living area along one end, with bedrooms grouped at the other. Keeping the plan open also makes the modest width feel larger.
- Does a 30x50 need a bigger slab and HVAC than a smaller barndo?
- Slightly. The slab and HVAC scale with the footprint and volume, but the step up from a 30x40 is small. These fixed systems are part of why the all-in cost is never just the kit price.