30×40 · custom-designed
30×40 Barndominium
A 1,200 sqft (30 ft × 40 ft) custom steel barndominium — designed around your household, not pulled from a stock plan library. Shell kits ship from $28/sqft nationally; turnkey delivery through our vetted contractor network starts from $138,000 where coverage exists.
Pricing
How Much Does a 30×40 Barndominium Kit Cost?
The shell kit for a 30×40 starts from $33,600 — that’s $28/sqft across the 1,200 sqft footprint, and it covers the engineered steel frame, roof and wall panels, fasteners, hardware, and delivery to your site. Turnkey — move-in ready — starts from $138,000, at a blended $115–$200/sqft, all-in across the full footprint.
Finish level is the single biggest variable inside the turnkey range. Cabinets, flooring, countertops, and fixtures can roughly double the per-sqft cost between a builder-grade package and a high-end finish — and at 1,200 sqft, the swing is real but contained compared to larger footprints. After finish level, foundation type is the next lever: a standard slab, a frost-protected shallow foundation in northern climates, or a pier system each carry different costs, and your local frost depth and soil conditions set which one applies. The insulation and HVAC package rounds out the top three — a tight building envelope with a properly sized mini-split or heat pump system costs more upfront but matters more on a smaller footprint where the box is easier to condition.
If your plan includes a shop or garage bay (the living + small shop or shop-house split layouts), the sidewall height, door spec, and whether you condition the shop space add meaningful cost on top of the residential portion. Site-specific work — utility runs, septic, well, and driveway — is entirely site-driven and can be a significant line item in rural areas. Geography sets the floor and ceiling of the whole range: Midwest and Southern rural markets sit at the low end; rural Northeast, mountain West, and Pacific Northwest sit at the high end. For accurate pricing in your market, see your state page.
What fits
What Can You Fit in a 30×40 Barndominium?
A 30×40 supports a complete single-story home: 2 bedrooms, 1–2 bathrooms, an open kitchen and living area, a small utility room, and a covered porch — comfortable for one to two people or a small family without a separate shop or workshop taking square footage off the living side.
The full-house layout uses all 1,200 sqft for living. It’s efficient and well-proportioned at this width — 30 feet is enough for two bedrooms side by side with a real open-plan kitchen and living room without feeling pinched. A loft is the most common add-on: framed above the main living area, it picks up a second-floor bedroom, home office, or storage without increasing the footprint — effectively getting you to a 2 BR + loft or 3-bedroom-equivalent configuration in the same envelope.
Two alternatives give the 30×40 a shop dimension. The living + small shop layout allocates roughly 900 sqft to living (2 BR, 1 BA, open plan) and 300 sqft to a single-bay workshop or garage — a real bay, but a compact one. The shop-house split goes to roughly 600/600, with a 1 BR, 1 BA studio-scale home and a single-bay shop. Both are workable, but the 30×40 envelope is honest: buyers who want a real shop-house typically find this split cramped on both sides and step up to a 30×50 or 40×60 where the square footage supports both uses without compromise.
The 30×40 advantage
The smallest footprint that delivers a complete, single-story home.
At 1,200 sqft, a 30×40 is not a compromise on a smaller footprint — it is the floor of what makes a real home: two bedrooms that fit actual furniture, a kitchen and living area that function as a single open room, and a covered porch. The 30-foot width is the structural key. It gives you enough span to place two bedrooms side by side and still fit a full-width common area without resorting to a galley layout. Smaller footprints can’t do that without the floor plan feeling like a hallway with walls.
That’s what separates a 30×40 from a cabin shell or a storage building dressed up as a home. It’s also what makes the loft upgrade so effective here: because the structural span is already adequate, adding a loft doesn’t require a redesign — it layers real usable space vertically and lets the footprint punch above its class for buyers who need a flexible second room without stepping up in size and cost.
Layouts
How a 30×40 Can Lay Out
We design custom plans — not stock floor plans. The 1,200 sqft footprint runs from a full single-story home to a modest shop-forward split, drawn around your household and site.
The same 30×40 shell runs the full range — from All-living to Living + small shop, and anywhere in between. These are common starting points, not fixed plans. Every 30×40 we build is custom-drawn from scratch.
Drawn to scale. The living-to-shop split shown is just one of many possible layouts — every 30×40 is designed from scratch.
The default and most popular configuration for this size uses all 1,200 sqft for your living plan: 2 bedrooms, 1–2 bathrooms, an open kitchen and living area, and a utility room. A covered porch is typically added off one end without consuming interior square footage. This is the layout that works best when the 30×40 is your primary home, cabin, or ADU — you get a complete, proportioned house without any trade-offs.
The living + small shop configuration carves roughly 300 sqft from one end for a single-bay garage or workshop, leaving about 900 sqft of living. That 300-sqft bay fits one vehicle or a basic workbench setup — real utility, but not a serious fabrication or hobby shop. If a working bay is part of your plan but one bay is enough, this layout earns it without gutting the living side.
The mostly shop split — roughly 600 sqft of living and 600 sqft of shop — is possible, but honest: both sides are tight. A 600 sqft home is studio-scale (1 BR, 1 BA, combined kitchen and great room), and a 600 sqft single bay gives you depth but no room for equipment and workflow side by side. Buyers who land on this configuration usually discover they want more of one or the other, and the natural next step is a 30×50 (adds a proper attached bay to the same home) or a 40×60 (doubles the footprint and gives you a real 2-bay shop-house). Worth knowing before you commit to the 30×40 envelope.
The loft add-on is the most popular customization at this size. Framed above the main living area — typically over the living room or utility end — it adds a real second-floor room for a bedroom, home office, or storage without touching the footprint or foundation. Other custom options include vaulted ceilings (which affect insulation spec and HVAC sizing), covered porches, exterior color and metal-panel selection, your finish package, and interior wall layout — open-concept versus individually walled bedrooms.
Best for
What a 30×40 Barndominium Is Best For
A 30×40 suits first-time buyers, weekend-cabin owners, rural downsizers, and ADU or rental investors who want a complete, single-story home on rural acreage at the most accessible entry price in the barndominium category.
First-time buyers entering rural land ownership get a finished, permanent home at a price point that leaves budget for land, well, septic, and driveway — the full land package — without stretching to a larger footprint. The 30×40 is also the category’s most common weekend or hunting cabin build: buyers who want a real home they can lock and leave, not a shed or a camper, find this size hits the sweet spot between cost and comfort.
Rural downsizers coming off a larger suburban house often find the 1,200 sqft footprint — especially with a loft — hits their actual daily space needs while eliminating maintenance overhead. And as an ADU or rental, the 30×40 is well-suited for a guest house, in-law suite, or short-term rental on family land: it’s a complete, self-contained home with its own kitchen, bath, and bedroom count, sized to appraise and finance as a standalone structure in many markets. Investors building affordable rental stock in low-cost rural markets use the same footprint for the same reason — it’s a real, permanent structure at a cost basis that pencils for rental yield.
Size comparison
30×40 vs. Other Sizes
| 30×40 | 30×50 | 40×60 | |
|---|---|---|---|
| Footprint | 1,200 sqft | 1,500 sqft | 2,400 sqft |
| Turnkey range | $138,000–$240,000 | $172,500–$300,000 | $276,000–$480,000 |
| Best for | Starter, cabin, ADU | Starter home + shop bay | Family home + 2-bay shop |
The 30×40 is the smallest in the cluster. At 1,200 sqft, it is a pure starter or cabin home — no meaningful shop bay without a trade-off that most buyers find too tight. Step up to the 30×50 at 1,500 sqft and the extra 300 sqft goes almost entirely to a single attached shop bay alongside the same single-story home — the natural next step if a real working bay is part of your build program. The step to a 40×60 is a different product entirely: at 2,400 sqft, you double the footprint, gain a 2-bay shop, and build a 2–3 BR family home in one envelope. That’s a full shop-house, not a house with a bay. Know which product you’re buying before you size the footprint.
Kit or turnkey
Kit or Turnkey: How Most Buyers Build a 30×40
Most buyers at this size choose turnkey because they can’t erect a steel shell themselves. Here’s exactly where the kit ends and the finished home begins.
The shell kit — from $33,600 for a 30×40 — is the engineered steel structure: frame, roof and wall panels, fasteners, hardware, and delivery to your site. Everything that makes it a livable home comes after: the slab, erection, electrical, plumbing, HVAC, insulation, drywall, flooring, cabinetry, fixtures, and finish work. Turnkey delivery, coordinated through our vetted contractor network where coverage exists, covers all of it in one managed process — so you’re working with one point of contact instead of sourcing and scheduling a dozen subcontractors yourself.
The process
How Turnkey Delivery Works
Turnkey delivery runs in four stages. We coordinate the vetted contractors at each one, so you manage one process instead of a dozen subcontractors.
FAQ
Frequently Asked Questions
How much does a 30×40 barndominium cost?
The shell kit starts from $33,600 (from $28/sqft across 1,200 sqft). Turnkey — move-in ready — starts from $138,000, with the full blended range running $138,000–$240,000 depending on finish level, foundation type, HVAC package, and geography. See your state page for market-specific pricing.
Is a 30×40 barndominium big enough to live in full-time?
Yes — 1,200 sqft with 2 bedrooms and 1–2 bathrooms is a complete single-story home, comfortable for one to two people or a small family. A loft add-on picks up a usable second-floor room (bedroom, office, or storage) without increasing the footprint, and is the most popular upgrade at this size for buyers who want a flexible extra space.
Can a 30×40 work as a starter home, cabin, or ADU?
All three. As a starter home it delivers a full-sized, permanent structure at the most accessible entry price in the barndominium category. As a weekend or hunting cabin it’s a real, lockable home rather than a glorified shed. As an ADU, guest house, in-law suite, or short-term rental it is a self-contained, permittable structure on a single slab — sized to function as a standalone home on family land.
What’s the difference between a 30×40 and a 30×50 barndominium?
The 30×50 adds 300 sqft — and that extra length goes almost entirely to a single attached shop bay alongside the same single-story home. If you want a real working bay as part of your build and don’t want to trade living space to get it, the 30×50 is the natural next step. The 30×40 is the right choice when the home is the whole program.
Can I get a 30×40 as a custom design?
Yes — we design custom plans, not stock floor plans. Your 30×40 is drawn around your household, site orientation, and build priorities: open-concept or walled bedrooms, loft or no loft, covered porch size and placement, finish package, exterior color, and metal-panel selection are all part of the design conversation.