A 40×80 barndominium gives you 3,200 square feet in a long, versatile footprint — enough for a spacious four- or five-bedroom home, or the classic shop-house: a full residence on one end and a heated shop or garage on the other, all under one roof. Forty feet wide keeps the structure economical and easy to span, while eighty feet of length gives you room to separate living, sleeping, and working spaces cleanly. It’s a favorite for larger families, tradespeople, and anyone who wants serious workspace attached to a comfortable home.
This guide covers what a 40×80 costs to build in 2026, the best floor plans you can buy today, popular ways to lay out 3,200 square feet, and how to finance it.
How much does a 40×80 barndominium cost?
The figures below are calculated from the per-square-foot rates in our barndominium cost guide, where you’ll find the full breakdown and a calculator. Here’s how a 40×80 (3,200 sq ft) shakes out in 2026:
| Build type | Cost per sq ft | 40×80 (3,200 sq ft) |
|---|---|---|
| Kit materials only | $20 – $35 | $64,000 – $112,000 |
| Shell, erected | $30 – $50 | $96,000 – $160,000 |
| Finished — standard finish | $80 – $120 | $256,000 – $384,000 |
| Finished — high-end | $150+ | $480,000+ |
One thing to keep in mind: if you build a shop-house and finish only part of the 3,200 sq ft as living space — leaving the rest as an insulated shop or garage — your real-world cost lands well below a fully-finished figure, because shop space costs far less per square foot than living space. Most owner-directed 40×80 homes finish around $256,000–$384,000 at a standard finish; a shop-house can come in lower. If you’re pricing a kit, it covers the shell only.
Best 40×80 barndominium floor plans
Here are three of the biggest and most popular ways to use a 40-foot-wide, long footprint — all complete, buildable plan sets. Most fit the 4-bedroom to 5-bedroom range.
PL-61002 Penny — 5 bed / 2 bath + garage (true 40×80)
3,200 sq ft heated · 80’×40′ footprint · single story · 5 bedrooms, 2 baths · 1,200 sq ft attached garage · $1,349.99
The plan built for this exact footprint. Penny lays a full five-bedroom home out along a true 40-by-80 with an open concept, a spacious master suite with dual closets, and a big attached garage — the maximum-bedroom option and a natural fit for a large family or a shop-house.
PL-62522 Noah — 4 bed / 3 bath + big porches
3,230 sq ft heated · single story · 4 bedrooms, 3 baths · 1,520 sq ft of covered porches · $1,349.99
A polished single-story family home. Noah pairs four bedrooms and three full baths with an enormous 1,500+ sq ft of front and back covered porch — indoor-outdoor living at scale, ideal for entertaining or a rural view.
PL-62515 Isabel — 3 bed / 3.5 bath + 3-car garage
3,130 sq ft heated · single story · 3 bedrooms, 3.5 baths · attached 3-car garage (1,049 sq ft) · 857 sq ft porch · $1,349.99
For those who want space and a garage over bedroom count. Isabel gives each bedroom room to breathe, adds a half-bath plus three full baths, and attaches a three-car garage — a refined layout that still leaves plenty of a 40×80 footprint for a shop.
Want more options? Browse our 1,200+ floor plans or create a custom design → sized to your 40×80.
Popular 40×80 layout ideas
Eighty feet of length gives you room to do things shorter footprints can’t.
Shop-house. Finish 1,800–2,400 sq ft as a full home on one end and leave the rest as a heated shop or garage with tall doors — the classic 40×80 setup for tradespeople, farmers, and hobbyists.
Long single-story family home. Run the home the full length with a great room in the middle, bedrooms at one end, and a primary suite at the other — easy, one-level living with real separation.
Four or five bedrooms. 3,200 sq ft comfortably fits a big family (the Penny approach), with room for an office, playroom, or bonus space.
RV or equipment bay. Dedicate part of the length to a tall bay for an RV, boat, or farm equipment, with living quarters alongside.
Advantages and disadvantages of a 40×80 barndominium
Advantages
- Room for a large family or a full home plus a shop under one roof
- The economical 40-foot width keeps the structure and spans affordable
- The long footprint separates living, sleeping, and working spaces cleanly
- Cheaper per square foot on any shop portion than finished living space
Disadvantages
- The long, narrow shape needs a lot that can accommodate it
- More total building to finish than a 40×60 — costs scale up
- Heating and cooling a large footprint means insulation quality matters
Other costs to consider
Beyond the kit and finishes, budget for land, site prep and a slab (plus septic and a well on rural land), utility hookups, and interior finishes across whatever portion you finish as living space. A well-insulated shell — SIP panels or quality spray foam — pays off at this size. Our cost guide breaks every line item down.
Financing a 40×80 barndominium
A larger, sometimes mixed-use build means lender fit matters. Construction-to-permanent loans are the usual route; USDA Rural Development loans and Farm Credit lenders suit many rural and shop-house builds; VA loans are worth checking for eligible veterans. See our full barndominium financing guide for loan types, requirements, and how to beat the appraisal hurdle. (General information, not financial advice.)
Other popular barndominium sizes
Comparing sizes? Here are the closest neighbors:
- 40×60 barndominium (2,400 sq ft) — the most popular size
- 50×60 barndominium (3,000 sq ft) — a wider 3,000 sq ft home
- 60×100 barndominium (6,000 sq ft) — the largest shop-house footprint
- See all barndominium sizes →
40×80 FAQ
How much does a 40×80 barndominium cost? At a standard finish, a 40×80 home typically runs $256,000–$384,000 in 2026 ($80–$120 per sq ft), up to $480,000+ for high-end. The shell alone is $96,000–$160,000 erected ($64,000–$112,000 for kit materials only). A shop-house that finishes only part as living space costs less. See our cost guide.
How many square feet is a 40×80 barndominium? A 40×80 barndominium is 3,200 square feet of footprint. A loft or second story adds more.
Is a 40×80 barndominium good for a shop-house? Yes — it’s one of the most popular shop-house footprints. Finish part as a home and leave the rest as a heated shop or garage, all under one roof.
How many bedrooms fit in a 40×80 barndominium? Four or five comfortably in a full-home layout (the Penny fits five), plus room for an office or bonus space — or fewer bedrooms if you’re giving part of the length to a shop.
Can I get a floor plan for a 40×80 barndominium? Yes — plans built for this long footprint, including the three above, start around $1,350 and can be customized, or you can commission a custom shop-house design.
Ready to build your 40×80 barndominium?
Start with a floor plan — pick a big design or a shop-house layout and customize it. Browse 1,200+ floor plans →
Work out your budget — see our full cost guide →
Compare your options — a steel kit, a prefab shell, or a custom plan. Get started →
This page is for general informational purposes and isn’t a substitute for confirming requirements with your county building and zoning office, a licensed contractor, or a mortgage professional. Costs and local ordinances change — verify current requirements for your parcel before you build.
