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This is small-structure framing, not furniture — and that's exactly why it's a good first building. Every skill in a shed, cabin, or coop is here at outhouse scale: a treated floor system with 2x6 decking, two stud walls with a 15° slope cut into the top plates, plywood sheathing that ties everything rigid, a tin shed roof, and a hung door. Get this right and you've earned the right to build something bigger.
The 15° business is less scary than it reads. The wall studs step down in 6" increments (80-1/4", 74-1/4", 68-1/4" long points, each with one end cut at 15°), so the roof plane is built into the walls themselves — no rafter cutting, no bird's mouths. The plywood gets cut to the same slope and the roof panel just lands on top. All the geometry happens on the miter saw, flat on the ground.
Material choices are driven by weather and ground contact: treated 2x4/2x6 for the base and decking (the front deck is rained on, full stop), exterior plywood everywhere, galvanized fasteners, and screw-down tin over the roof plywood. Gate hardware — not door hardware — hangs the board-and-batten door, because gate hinges shrug off sag and weather that would kill interior hinges inside a year.
One safety detail from the source build that must not get lost: if the door latches with a gate clasp on the outside, rig a way to open it FROM THE INSIDE — the source drilled a hole and ran a string to the clasp. An outhouse that can latch someone in is a genuinely dangerous mistake, and it's a two-minute fix during the build.
| Item | Qty |
|---|---|
| Exterior plywood, 1/2", 4x8 sheetWall sheathing, roof, and back panels. | 3 each |
| 2x4, 12 ft, pressure treatedBase rails — ground contact rated. | 1 each |
| 2x4, 10 ft, pressure treatedBase cross members. | 1 each |
| 2x6, 6 ft, pressure treatedFloor decking — the front deck lives in the rain. | 4 each |
| 2x2, 29", treated or weather resistantA railing spindle works — it comes treated in short lengths. | 1 each |
| 2x4, 8 ftWall framing and roof tie-ins. | 11 each |
| 1x10, 8 ftDoor boards. | 3 each |
| 1x6, 8 ftDoor battens. | 1 each |
| 1x4, 8 ftDoor diagonal braces. | 1 each |
| Gate hingesGate hardware, not interior door hinges — it's built for weather and sag. | 3 each |
| Gate latch and handlePlus a string-through-a-hole so it opens from inside. Not optional. | 1 each |
| Metal roofing, 36" wide x 54" | 1 each |
| Roofing screws with washers, up to 2"Color-matched, gasketed — they seal their own holes. | 30 each |
| Deck screws, 3", self-tapping | 100 each |
| Galvanized nails, 8DSheathing. Brads, staples, or screws also work — whatever your tools drive. | 200 each |
| Exterior screws, 1-1/4"Door construction. | 50 each |
Overall cost: $$$$. Lumber prices vary by region, species, and season, so we give a band rather than a figure we would only be pretending to know.
| Part | Qty | T × W × L |
|---|---|---|
| Base railsTreated 2x4 | 2 | 1 1/2" × 3 1/2" × 72" |
| Base cross membersTreated 2x4 | 3 | 1 1/2" × 3 1/2" × 33" |
| Floor deckingTreated 2x6 | 7 | 1 1/2" × 5 1/2" × 36" |
| Bench front rail2x2 | 1 | 1 1/2" × 1 1/2" × 29" |
| Bench supports2x4 | 2 | 1 1/2" × 3 1/2" × 24 1/2" |
| Wall top plates2x4Long point to short point, both ends cut parallel at 15°. | 2 | 1 1/2" × 3 1/2" × 48 1/8" |
| Wall studs, front2x4Longest point, one end at 15°. | 2 | 1 1/2" × 3 1/2" × 80 1/4" |
| Wall studs, middle2x4Longest point, one end at 15°. | 2 | 1 1/2" × 3 1/2" × 74 1/4" |
| Wall studs, rear2x4Longest point, one end at 15°. | 2 | 1 1/2" × 3 1/2" × 68 1/4" |
| Wall bottom plates2x4 | 2 | 1 1/2" × 3 1/2" × 46 1/2" |
| Wall sheathing1/2" exterior plywood83-3/8" at the tall edge sloping to 70-1/2" — the 15° roof line, cut with a guide. | 2 | 1/2" × 48" × 83 3/8" |
| Front/back tie-in, 2x62x6 | 1 | 1 1/2" × 5 1/2" × 36" |
| Tie-in framing2x4 | 4 | 1 1/2" × 3 1/2" × 35" |
| Roof supports2x4 | 2 | 1 1/2" × 3 1/2" × 28" |
| Roof plywood1/2" exterior plywood | 1 | 1/2" × 36" × 52" |
| Back panel, lower1/2" exterior plywoodThe scrap from the roof piece. | 1 | 1/2" × 36" × 44" |
| Back panel, upper1/2" exterior plywoodMay need piecing from scraps — it's the back; nobody's judging. | 1 | 1/2" × 36" × 26 1/4" |
| Door boards1x10 | 3 | 3/4" × 9 1/4" × 77" |
| Door battens1x6 | 3 | 3/4" × 5 1/2" × 27 3/4" |
| Door braces1x4Both ends at 37-1/2° off square, ends parallel, long point to short point. | 2 | 3/4" × 3 1/2" × 38" |
Buy 28 boards at 8 ft.
4 boards
14 boards
Build the floor frame from the treated 2x4s — two 72" rails, three 33" cross members. If the ground under it isn't flat and firm the whole footprint, step up to 2x6 for the frame or set it on beams; a floor system is only as good as what it bears on.
Three-inch deck screws, two per joint, and check the frame for square by comparing diagonals.
Screw the seven treated 2x6 deck boards across the frame. The front boards form an exposed entry deck that takes direct rain — this is why the decking is treated stock and not a plywood floor that would delaminate in two seasons.
Each wall is a bottom plate, three studs of stepping heights (80-1/4", 74-1/4", 68-1/4" long points, 15° cut on top), and the 15° top plate tying the slope together. Frame both flat on the deck.
The stepped studs ARE the roof pitch — that's the whole trick of this design. Keep each stud's long point oriented the same way and the top plate lands perfectly.
Attach the plywood side panels with the walls still flat — nailing sheathing on the ground beats nailing it on a ladder every time. The two walls are MIRRORS of each other, not copies: lay them out facing each other before fastening anything.
At the short (rear) end, the plywood overhangs the back framing by 1-1/2" — that overhang closes over the back wall assembly later. Nail off at all edges and intermediate studs.
Stand both walls on the base, screw them down through the bottom plates, and connect them front and back with the 2x4 and 2x6 tie-in pieces. The structure is wobbly until the ties go in, so have a helper or brace one wall plumb while you set the other.
Check plumb on both walls before the final screws — the door gets hung in this opening, and a racked opening means a door that binds forever.
Install the remaining 2x4 supports across the top between the walls. The roof plywood is only 1/2" — it needs bearing every couple of feet or it'll oil-can underfoot the first time someone clears snow off it.
Nail the roof plywood to every tie-in and support it crosses. Then lay the metal roofing over it and drive the gasketed roofing screws through the flats (follow the panel maker's pattern), snug enough to seat the washer without dimpling the tin.
The tin overhangs the high (front) edge slightly so drips fall past the door, not onto it.
Cover the back with the plywood panels — the roof offcut plus a pieced upper panel. The source considered acrylic glazing for the upper back panel for light; plywood is the weathertight default, but a polycarbonate panel there is a legitimate upgrade if the outhouse has no other light source.
Frame the bench with the 2x4 supports and 2x2 rail, top it, and cut the seat opening with the jigsaw — drill a starter hole inside the line first. Sand the opening edge well and round it over; this is one build where nobody forgives a splinter.
Lay the three 1x10s side by side, square them, and screw the three 1x6 battens across at top, middle, and bottom with the 1-1/4" screws. Add the two 37-1/2° braces running from the hinge side down — a board-and-batten door without diagonal bracing sags into a parallelogram within a year.
Hang it on the gate hinges, mount the latch and handle — and then the non-negotiable: drill a hole and run a string to the clasp so the door opens from the inside. Test it yourself, door closed, before anyone else uses the building.
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Assumes 8 ft stock, a 1/8" saw kerf, and buying each part at its own width. Change the board size or kerf on the full board plan →