40x80 Barndominium Kit
A 40x80 barndominium kit gives you room to split the building down the middle: roughly 2,000 sq ft of living space and a 1,200 sq ft shop or garage, or a large one-story home with a three-car garage under the same roofline.
- Footprint
- 40′ × 80′
- Floor area
- 3,200 sq ft
- Typical eave
- 12–16 ft
- Clear span
- 40 ft
What a 40x80 barndominium kit costs
Plan on $80K–$240K in materials for a 40x80 (3,200 sq ft). Industry range of $25–$75 per sq ft for barndominium shell materials, applied to this footprint. Interior finish, labor, concrete and site work are separate.
Your exact number depends on the choices on the right. Send us the size, use and build-site zip code and we will send back an engineered price for your site — usually the same business day.
Full cost guide →What moves the price
- Eave heightTaller walls mean longer columns, more steel and bigger doors.
- Doors and windowsCount and size of overhead doors is often the biggest single swing.
- Snow and wind loadsHigh-snow and high-wind counties need heavier trusses and tighter spacing.
- Steel and finishesWoodgrain or textured steel, stone wainscot and pre-finished siding.
- Porches and lean-tosCovered space on a sidewall adds cost, but far less than more building.
- Insulation and linerInterior liner panels and insulation packages for heated space.
What people build with a 40x80
- Home with an attached shop
- Large one-story family home
- Living quarters plus equipment bay
- Home with a three-car garage
Typical doors: Residential entries and windows on the living side, 10–14 ft overhead doors on the shop side
Sizing notes from the field
- Split it 40x50 living and 40x30 shop behind a rated wall; the 40 ft clear span keeps both sides open.
- A 14 ft eave fits 12 ft shop doors and still allows vaulted living space. Go to 16 ft if the shop needs a 14 ft RV door.
- Run a porch across the living half of one sidewall for shade and curb appeal.
- At 80 ft long, windows on both sidewalls keep the middle rooms bright.
What ships in a 40x80 kit.
- Engineered trussesCustom spans up to 86′ in one piece, designed for your site’s snow and wind loads and built in Wheatland.
- Laminated columnsStraighter than solid posts, with better treatment penetration where the column meets the ground.
- Steel roofing & siding35+ colors, including textured finishes and a woodgrain, backed by a 40-year paint warranty.
- Trim & flashingRidge cap, corner trim, J-channel and drip edge, color-matched to your steel.
- Fasteners & hardwareEvery screw, bolt, bracket and closure strip the build calls for — counted, not guessed.
- Stamped engineeringSite-specific drawings for your county’s loads, ready to hand to the building department.
- Delivered on our trucksOur flatbeds, our drivers, with an onboard forklift to set materials where your crew wants them.
Not included: concrete, site work, labor, insulation and interior finish. We’ll tell you exactly where the package stops before you order.
See every component →40x80 kit questions.
How much does a 40x80 barndominium kit cost?
Using the industry range of $25 to $75 per sq ft for shell materials, a 40x80 barndominium shell runs roughly $80,000 to $240,000. Eave height, windows, shop doors and finish level move the number most. Interior finish, labor, concrete and site work are separate.
How do you lay out a 40x80 barndominium with a shop?
The common split is about 40x50 of living space and a 40x30 shop or garage at one end, separated by a rated wall per your local code. The clear-span trusses mean neither side needs interior posts.
Can a 40x80 barndominium include an RV garage?
Yes. Plan a 16 ft eave so the shop end can take a 14 ft tall overhead door for a motorhome or fifth-wheel.
What is included in a 40x80 kit from Western?
Engineered trusses, laminated columns, steel roofing and siding, trim and flashing, fasteners and hardware, framing for doors and windows, and stamped engineering drawings for your site. Concrete, labor, insulation and interior finish are not included.
Do you deliver to my area?
We deliver on our own trucks to Wyoming, Colorado, Montana, South Dakota, Nebraska, Kansas, Idaho, Utah, New Mexico, Texas and Nevada.
Other barndominium kits
Price your 40x80.
Tell us the use, eave height you have in mind and your build-site zip code. We will engineer it for your site and send back a price.
Mon–Thu 7am–5pm, Fri 8am–3:30pm MT