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24x30 Gambrel Barndominium Plans

A 720 sq ft barn-style home with a gambrel roof, 10-foot walls, a 12-foot loft, and an 8-foot-tall entry door on a slab.

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3D render of the 24×30 Gambrel Barndominium at golden hour, seen from the front corner — Rendered in the cabin builderOpen it in 3D to walk around it, change it, or see it at dusk.

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Floor plan

Plan specs

Footprint: 24' x 30'
Floor area: 720 sq ft
Loft: 360 sq ft (12' deep)
Porch: 240 sq ft (8' deep, front)
Wall height: 10'
Roof: Gambrel (barn), 8/12 pitch
Roofing: Corrugated metal
Siding: Board and batten
Foundation: Concrete slab
Windows / doors: 6 / 1
Est. materials: $23,372

Every figure here comes from the same engine the 3D builder runs, so it matches what you get when you open the plan.

About this plan

What the 24×30 Gambrel Barndominium is for.

Barndominiums are usually steel buildings. This one is wood-framed, which you can build with ordinary tools and trades, and it takes the barn shape from a gambrel roof and red siding instead.

Ten-foot walls under a gambrel roof leave a 12-foot-deep loft with standing room, which is where most of the extra space comes from. The 4-by-8-foot main door is sized for moving furniture or equipment in.

This is the largest plan in the library and the one most likely to need a permit, an engineered roof, and a builder. Treat the drawings and materials list as a starting budget and a set of sketches to bring to that conversation.

Good for

The most space in the library, over 1,000 sq ft counting the loft
A barn look with a wood-framed build
A shop-height main door

The drawings

Elevations, section, and foundation.

The same views that are in the PDF, dimensioned in feet and inches. Download the PDF to print them at letter size.

Front elevation

Side elevation

Wall and roof cross-section

Foundation plan

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Materials list

About $23,372 in materials.

Quantities come off the plan's dimensions with a 10 percent waste allowance, priced at typical U.S. retail. This is the shell only: labor, insulation, interior finishes, plumbing, and electrical are not included.

Download materials list (CSV)

Item	Qty	Unit	Est. cost
Foundation			$2,652
Concrete (ready-mix)4" slab with 5% waste	10	CY	$1,500
#4 rebar18" grid	960	LF	$1,152
Framing			$7,626
2x6 plates (bottom + double top)Treated bottom plate	357	LF	$643
2x6x10 wall studs16" OC	135	ea	$1,283
2x10 headers (doubled)Over window/door openings	64	LF	$179
2x10x24 floor joists16" OC	27	ea	$1,814
2x10 rim joist	119	LF	$333
2x8x24 ceiling joists16" OC	27	ea	$1,426
2x8x16 rafters	53	ea	$1,857
2x10 ridge board	33	LF	$92
Sheathing			$3,304
7/16" OSB wall sheathing (4x8)	31	sheets	$868
1/2" plywood roof sheathing (4x8)	42	sheets	$1,470
3/4" T&G plywood subfloor (4x8)	23	sheets	$966
Roofing			$1,381
Corrugated metal sheets	42	sheets	$1,050
Roof underlayment (synthetic)400 sqft/roll	4	rolls	$200
Drip edge	131	LF	$131
Siding			$2,958
1x12 boardsBoard-and-batten siding	1,087	LF	$2,174
1x3 battens	1,087	LF	$544
Housewrap9ft x 100ft rolls	2	rolls	$240
Windows & Doors			$1,660
WindowsStandard double-hung	6	ea	$1,200
Window trim/casing	6	sets	$180
Exterior doorsPre-hung exterior	1	ea	$250
Door trim/casing	1	sets	$30
Porch			$1,776
Deck boardsPressure-treated	264	sqft	$792
6x6 porch posts8ft pressure-treated	6	ea	$150
2x8 porch joists16" OC	212	LF	$466
Porch railing	46	LF	$368
Loft			$1,384
2x8 loft joists16" OC spanning width	291	LF	$640
3/4" plywood loft floor (4x8)	12	sheets	$504
Loft railing/guard	30	LF	$240
Fasteners & Hardware			$630
Nails, screws, joist hangersAssorted construction fasteners	1,800	sqft (est.)	$630
Estimated materials total			$23,372

These are concept drawings for planning and estimating, not engineered or stamped plans. Have a builder or engineer check framing sizes, spans, and connections for your snow, wind, and soil conditions before you order materials.

Common questions

Building the 24×30 Gambrel Barndominium.

The materials for this 24x30 Gambrel Barndominium estimate at about $23,372. The biggest lines are framing ($7,626), sheathing ($3,304), siding ($2,958). That covers the shell: foundation, framing, sheathing, roofing, siding, windows, doors, the porch, the loft and fasteners, at typical U.S. retail prices with a 10 percent waste allowance. It does not include labor, insulation, drywall, interior finishes, plumbing, electrical, or delivery, and local lumber prices vary.

At 720 sq ft, this plan is over the 200 sq ft limit the International Residential Code (section R105.2) uses to exempt small accessory structures, so in most places that adopt that code you should expect to need a building permit. Rules vary by county, and some rural counties do not enforce a residential building code at all, so ask your local building department before you build.

The PDF has six letter-size pages: a cover sheet with the specs, a dimensioned floor plan, front and rear elevations, left and right elevations, a wall-and-roof cross-section, and a foundation plan. The materials list downloads separately as a CSV you can open in Excel, Numbers, or Google Sheets to price at your local lumber yard. There is no signup and no email required. These are concept drawings for planning and estimating, not engineered or stamped construction documents.

Yes. Open the plan in the free 3D cabin builder and change anything: length, width, wall height, roof style and pitch, siding, foundation, porch, loft, every window and door, and the interior walls and rooms. The cost estimate updates as you go, and you can export your own version as a PDF and a materials list.

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