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12x20 Shed-Roof Cabin Plans

A 240 sq ft modern single-slope cabin with large front windows and a 6-foot porch, oriented to face the view.

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3D render of the 12×20 Shed-Roof Cabin 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: 12' x 20'
Floor area: 240 sq ft
Porch: 120 sq ft (6' deep, front)
Wall height: 9'
Roof: Shed (single slope), 3/12 pitch
Roofing: Standing-seam metal
Siding: Board and batten
Foundation: Concrete piers
Windows / doors: 4 / 1
Est. materials: $10,376

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 12×20 Shed-Roof Cabin is for.

A shed roof puts all the wall height on one side. This plan uses that tall front wall for two 4-foot windows and the door, so the room opens toward whatever you are looking at. Point it south in a cold climate and those windows collect winter sun.

The low 3/12 slope keeps the back wall short, which saves siding and makes the roof easy to reach for maintenance. Standing-seam metal is the right roofing at this pitch; shingles need more slope than this to shed water reliably.

The back of the cabin gets one window for cross ventilation. Everything else on that wall is free for a kitchen run or a bed.

Good for

A lot with a view in one direction
Passive solar gain when the tall side faces south
A clean, modern look with simple framing

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 $10,376 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			$324
Concrete pier blocksPre-cast pier blocks	12	ea	$180
4x4x8 treated postsPressure-treated	12	ea	$144
Framing			$3,298
2x6 plates (bottom + double top)Treated bottom plate	212	LF	$382
2x6x10 wall studs16" OC	90	ea	$855
2x10 headers (doubled)Over window/door openings	51	LF	$143
2x10x12 floor joists16" OC	19	ea	$638
2x10 rim joist	71	LF	$199
2x8x12 ceiling joists16" OC	19	ea	$502
2x8x14 rafters	19	ea	$580
Sheathing			$1,169
7/16" OSB wall sheathing (4x8)	16	sheets	$448
1/2" plywood roof sheathing (4x8)	11	sheets	$385
3/4" T&G plywood subfloor (4x8)	8	sheets	$336
Roofing			$1,569
Metal standing seam panels	321	sqft	$1,445
Roof underlayment (synthetic)400 sqft/roll	1	rolls	$50
Drip edge	74	LF	$74
Siding			$1,505
1x12 boardsBoard-and-batten siding	554	LF	$1,108
1x3 battens	554	LF	$277
Housewrap9ft x 100ft rolls	1	rolls	$120
Windows & Doors			$1,200
WindowsStandard double-hung	4	ea	$800
Window trim/casing	4	sets	$120
Exterior doorsPre-hung exterior	1	ea	$250
Door trim/casing	1	sets	$30
Porch			$1,026
Deck boardsPressure-treated	132	sqft	$396
6x6 porch posts8ft pressure-treated	5	ea	$125
2x8 porch joists16" OC	113	LF	$249
Porch railing	32	LF	$256
Fasteners & Hardware			$286
Nails, screws, joist hangersAssorted construction fasteners	816	sqft (est.)	$286
Estimated materials total			$10,376

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 12×20 Shed-Roof Cabin.

The materials for this 12x20 Shed-Roof Cabin estimate at about $10,376. The biggest lines are framing ($3,298), roofing ($1,569), siding ($1,505). That covers the shell: foundation, framing, sheathing, roofing, siding, windows, doors, the porch 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 240 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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