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40x80 Barndominium Floor Plans

A 40x80 barndominium has 3,200 square feet, enough for five bedrooms and a 30 ft bonus room, or four bedrooms with a great room 46 ft wide and a shop behind. Four layouts, measured, priced and editable.

Updated · By Sam Whitfield

40x80 Barndominium Floor Plans: Five bedrooms, 40 ft front, 40'-0" x 60'-0", with every room measured

The four 40x80 layouts

Each plan below is drawn to scale by the Plan Kiwi generator: walls, doors and windows in their real positions and every room labelled with its size. Open one in the editor to move walls, add furniture or see it in 3D.

1. Five bedrooms, 40 ft front

King bed 6'-8" x 6'-4"Bathtub 5'-0" x 2'-6"Toilet 2'-4" x 1'-8"Double vanity 1'-9" x 5'-0"Queen bed 6'-8" x 5'-0"Queen bed 6'-8" x 5'-0"Bathtub 5'-0" x 2'-6"Toilet 1'-8" x 2'-4"Vanity 3'-0" x 1'-9"Queen bed 6'-8" x 5'-0"Queen bed 5'-0" x 6'-8"Washer 2'-3" x 2'-3"Dryer 2'-3" x 2'-3"TV stand 5'-0" x 1'-6"Sofa 7'-0" x 3'-0"Coffee table 4'-0" x 2'-0"Dining table, 6 seats 6'-0" x 3'-6"REFRefrigerator 3'-0" x 2'-6"Counter run, 8 ft 8'-0" x 2'-0"Range 2'-6" x 2'-2"Kitchen island 6'-0" x 3'-0"PRIMARY BEDROOM12'-0" x 18'-0"PRIMARY BATH6'-6" x 12'-0"CLOSETFLEX ROOM12'-0" x 30'-0"BEDROOM 212'-0" x 18'-0"BEDROOM 312'-0" x 18'-0"BATH 212'-0" x 6'-0"BEDROOM 412'-0" x 18'-0"BEDROOM 510'-0" x 11'-0"LAUNDRYLIVING16'-0" x 19'-6"DINING16'-0" x 15'-6"KITCHEN16'-0" x 14'-0"COVERED PORCH40'-0"60'-0"40x80 Barndominium Floor Plans: Five bedrooms, 40 ft frontConcept plan for inspiration. Have it reviewed by an architect or builder before construction. plankiwi.com

40'-0" x 60'-0" · 2,400 sq ft · 5 bedrooms · 2 bathrooms

The 40 ft side faces the street. Four 12 x 18 ft bedrooms, a fifth behind the kitchen, and a 12 x 30 ft flex room in the primary wing.

Open "Five bedrooms, 40 ft front" in the editor

2. Four bedrooms and a shop, 80 ft front

King bed 6'-8" x 6'-4"Bathtub 5'-0" x 2'-6"Toilet 2'-4" x 1'-8"Double vanity 1'-9" x 5'-0"Queen bed 5'-0" x 6'-8"Queen bed 5'-0" x 6'-8"Bathtub 5'-0" x 2'-6"Toilet 1'-8" x 2'-4"Vanity 3'-0" x 1'-9"Queen bed 5'-0" x 6'-8"Washer 2'-3" x 2'-3"Dryer 2'-3" x 2'-3"TV stand 5'-0" x 1'-6"Sofa 7'-0" x 3'-0"Coffee table 4'-0" x 2'-0"Dining table, 6 seats 6'-0" x 3'-6"REFRefrigerator 3'-0" x 2'-6"Counter run, 8 ft 8'-0" x 2'-0"Range 2'-6" x 2'-2"Counter run, 8 ft 8'-0" x 2'-0"Counter run, 8 ft 8'-0" x 2'-0"Counter run, 8 ft 8'-0" x 2'-0"Kitchen island 6'-0" x 3'-0"Workbench 6'-0" x 2'-6"PRIMARY BEDROOM18'-0" x 18'-0"PRIMARY BATH10'-0" x 12'-0"CLOSET8'-0" x 12'-0"FLEX ROOM18'-0" x 10'-0"BEDROOM 216'-0" x 11'-3"BEDROOM 316'-0" x 11'-3"BATH 216'-0" x 6'-0"BEDROOM 416'-0" x 11'-6"LAUNDRYLIVING46'-0" x 14'-6"DINING46'-0" x 11'-6"KITCHEN40'-0" x 14'-0"SHOP20'-0" x 24'-0"COVERED PORCH80'-0"40'-0"40x80 Barndominium Floor Plans: Four bedrooms and a shop, 80 ft frontConcept plan for inspiration. Have it reviewed by an architect or builder before construction. plankiwi.com

80'-0" x 40'-0" · 3,200 sq ft · 4 bedrooms · 2 bathrooms

The 80 ft side faces the street: an 18 x 18 ft primary suite, three bedrooms on the far wing, a 46 ft wide great room and a 20 x 24 ft shop behind.

Open "Four bedrooms and a shop, 80 ft front" in the editor

3. Three bedrooms and a 2-car garage

King bed 6'-8" x 6'-4"Bathtub 5'-0" x 2'-6"Toilet 2'-4" x 1'-8"Double vanity 1'-9" x 5'-0"Queen bed 6'-8" x 5'-0"Bathtub 5'-0" x 2'-6"Toilet 1'-8" x 2'-4"Vanity 3'-0" x 1'-9"Queen bed 6'-8" x 5'-0"Washer 2'-3" x 2'-3"Dryer 2'-3" x 2'-3"TV stand 5'-0" x 1'-6"Sofa 7'-0" x 3'-0"Coffee table 4'-0" x 2'-0"Dining table, 6 seats 6'-0" x 3'-6"REFRefrigerator 3'-0" x 2'-6"Counter run, 8 ft 8'-0" x 2'-0"Range 2'-6" x 2'-2"Counter run, 8 ft 8'-0" x 2'-0"Counter run, 8 ft 8'-0" x 2'-0"Counter run, 8 ft 8'-0" x 2'-0"Kitchen island 6'-0" x 3'-0"Car 6'-6" x 15'-6"Car 6'-6" x 15'-6"PRIMARY BEDROOM18'-0" x 18'-0"PRIMARY BATH10'-0" x 12'-0"CLOSET8'-0" x 12'-0"FLEX ROOM18'-0" x 10'-0"BEDROOM 216'-0" x 17'-0"BATH 216'-0" x 6'-0"BEDROOM 316'-0" x 17'-0"LAUNDRYLIVING46'-0" x 14'-6"DINING46'-0" x 11'-6"KITCHEN40'-0" x 14'-0"2-CAR GARAGE22'-0" x 24'-0"COVERED PORCH80'-0"40'-0"40x80 Barndominium Floor Plans: Three bedrooms and a 2-car garageConcept plan for inspiration. Have it reviewed by an architect or builder before construction. plankiwi.com

80'-0" x 40'-0" · 3,200 sq ft · 3 bedrooms · 2 bathrooms

Fewer, larger bedrooms of about 16 x 17 ft, and the garage behind the laundry room.

Open "Three bedrooms and a 2-car garage" in the editor

4. Four bedrooms and a garage, 40 ft front

King bed 6'-8" x 6'-4"Bathtub 5'-0" x 2'-6"Toilet 2'-4" x 1'-8"Double vanity 1'-9" x 5'-0"Queen bed 6'-8" x 5'-0"Queen bed 6'-8" x 5'-0"Bathtub 5'-0" x 2'-6"Toilet 1'-8" x 2'-4"Vanity 3'-0" x 1'-9"Queen bed 6'-8" x 5'-0"Washer 2'-3" x 2'-3"Dryer 2'-3" x 2'-3"TV stand 5'-0" x 1'-6"Sofa 7'-0" x 3'-0"Coffee table 4'-0" x 2'-0"Dining table, 6 seats 6'-0" x 3'-6"REFRefrigerator 3'-0" x 2'-6"Counter run, 4 ft 4'-0" x 2'-0"Car 6'-6" x 15'-6"Car 6'-6" x 15'-6"PRIMARY BEDROOM12'-0" x 18'-0"PRIMARY BATH6'-6" x 12'-0"CLOSETFLEX ROOM12'-0" x 30'-0"BEDROOM 212'-0" x 18'-0"BEDROOM 312'-0" x 18'-0"BATH 212'-0" x 6'-0"BEDROOM 412'-0" x 18'-0"LAUNDRYLIVING16'-0" x 25'-6"DINING16'-0" x 20'-6"KITCHEN10'-0" x 14'-0"2-CAR GARAGE22'-0" x 24'-0"COVERED PORCH40'-0"60'-0"40x80 Barndominium Floor Plans: Four bedrooms and a garage, 40 ft frontConcept plan for inspiration. Have it reviewed by an architect or builder before construction. plankiwi.com

40'-0" x 60'-0" · 2,400 sq ft · 4 bedrooms · 2 bathrooms

Four 12 x 18 ft bedrooms along the wings and a great room more than 45 ft deep.

Open "Four bedrooms and a garage, 40 ft front" in the editor

The layouts side by side

LayoutFootprintLiving areaBedsBathsLargest bedroomGreat roomAlso
Five bedrooms, 40 ft front40'-0" x 60'-0"2,400 sq ft5212'-0" x 18'-0"16 ft wideflex room, covered porch
Four bedrooms and a shop, 80 ft front80'-0" x 40'-0"3,200 sq ft4218'-0" x 18'-0"46 ft wideflex room, shop, covered porch
Three bedrooms and a 2-car garage80'-0" x 40'-0"3,200 sq ft3218'-0" x 18'-0"46 ft wideflex room, 2-car garage, covered porch
Four bedrooms and a garage, 40 ft front40'-0" x 60'-0"2,400 sq ft4212'-0" x 18'-0"16 ft wideflex room, 2-car garage, covered porch

Measured on the plans above, as generated on 27 October 2026. Footprints are width (the side facing the street) by depth. Bathrooms count full rooms; dimensions are inside the walls of each room as drawn.

What 3,200 square feet allows

At 3,200 square feet the question is no longer how many bedrooms fit but how much of the building goes to living space. On the 40 ft front layout, the generator lines four 12 x 18 ft bedrooms along the wings, puts a fifth behind the kitchen and still has a 12 x 30 ft room left in the primary wing: a game room, a home office for two, or a guest suite once you add a door to the hall bath.

The Google results for this size are mostly 40x80 steel kits, a Pinterest board and a Reddit thread comparing 40x80 with 40x100. Floor plans with real room sizes are rare, which is why every plan on this page lists them.

The 80 ft front: a wide house

Turned with its 80 ft side to the road, the building becomes a long, low house with a great room 46 ft across: room for a kitchen with an island, a dining table and two separate living areas. The bedrooms keep the same wing arrangement as the smaller sizes, so the plan reads like a 40x60 with a much bigger centre.

If that centre feels too large, open the four bedroom shop layout and drag one wing wall inward: the freed width becomes part of a wider bedroom wing, or a fifth bedroom.

Cost to build a 40x80 barndominium

A 3,200 sq ft barndominium costs about $256,000 to $384,000 to build with a standard finish, using the $80 to $120 per square foot range Houseplans.com gives for 2026, land excluded. Across the full published range of $65 to $160, it runs from about $208,000 to $512,000. A stick-built house of the same size, at $130 to $180 per square foot, would cost $416,000 to $576,000.

Houseplans.com estimates the saving of a barndominium over a conventional house at roughly 15 to 25 percent in most markets, and at this size that difference is large in dollars. The calculator adds land, site work and plans.

StateStandard finishFull range
United States$256,000 to $384,000$208,000 to $512,000
Texas$248,000 to $372,000$202,000 to $496,000
Tennessee$243,000 to $365,000$198,000 to $486,000
Oklahoma$244,000 to $366,000$198,000 to $488,000
Florida$259,000 to $389,000$210,000 to $518,000
Georgia$249,000 to $373,000$202,000 to $498,000
Alabama$247,000 to $371,000$201,000 to $495,000
Missouri$243,000 to $365,000$198,000 to $486,000
Arkansas$244,000 to $366,000$198,000 to $487,000
North Carolina$251,000 to $376,000$204,000 to $502,000
Kentucky$249,000 to $373,000$202,000 to $497,000

House only, 3,200 sq ft, land, site work, garage and shop excluded. National range: Houseplans.com, 2026 ($80 to $120 per sq ft standard, $65 to $160 overall). State figures: the national range multiplied by the state's BEA Regional Price Parity for services (2024), an estimate rather than a quote.

Shop, garage or more house

The shop and garage on this page sit behind the house and share a wall with it, so the full 3,200 sq ft stays heated living space. Many 40x80 projects instead give part of the shell to a shop bay. To try that, open the 40 ft front plan with garage, move the back wall of the great room forward, and rename the space behind it.

For a smaller starting point with the same proportions, see the 30x60 plans.

Questions

How many square feet is a 40x80 barndominium?

A 40x80 barndominium has a 3,200 square foot footprint. A shop, a garage or a covered porch adds area outside it.

How many bedrooms fit in a 40x80 barndominium?

A 40x80 barndominium fits five bedrooms and two baths with a 12 x 30 ft flex room left over, or four larger bedrooms with a great room 46 ft wide on an 80 ft front.

How much does a 40x80 barndominium cost to build?

A 40x80 barndominium costs about $256,000 to $384,000 to build with a standard finish, at $80 to $120 per square foot (Houseplans.com, 2026). Land, site work, a shop and a garage are extra.

Is 40x80 too big for a barndominium?

A 40x80 is large for a single-family barndominium: 3,200 square feet is enough for five bedrooms or for four bedrooms and very generous shared rooms. Families who want a shop often choose it and give part of the shell to the shop.

Should a 40x80 barndominium face the road on the long side?

Put the 80 ft side to the road for a wide house where every bedroom has an outside wall; put the 40 ft side to the road on a narrow, deep lot. Both versions are drawn above.

Sources

  1. Houseplans.com, Is it cheaper to build a house or barndominium in 2026?, read 27 October 2026.
  2. Realtor.com, How much does it cost to build a barndominium?, read 27 October 2026.
  3. US Bureau of Economic Analysis, Regional Price Parities by state, "Services: Other", 2024 (table SARPP, released 19 February 2026), read 25 October 2026.