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Most DIY outdoor sofas are boxes with cushions, and they sit like boxes. This design is different where it counts: the back is built as its own slatted panel that installs LEANING — anchored at the seat base, resting against the frame's top rail — so the recline is real geometry, not two inches of foam pretending. Paired with a slatted seat deck on cleats, the sofa is comfortable in a way box-frame builds aren't.
The frame is pocket-hole joinery throughout, and the plan is disciplined about hiding it: every step names which way the holes face (inside, or down). Follow that — on patio furniture there's no 'wall side' to hide mistakes against.
Two build notes matter. First, the plan's own correction: the diagram in step 6 is wrong, and the back base should be 79-1/2" with 2" overhangs — the cut list is right, the picture isn't. Second, the slat-spacing trick in step 5 (attach ends and middle first, then space the rest) is the difference between an even back and one with a cumulative half-inch error at the far end. Size cushions before building: the 23-1/2" seat slats suit standard 24–25" deep outdoor seat cushions.
| Item | Qty |
|---|---|
| 2x2, 8 ftBack rest top and seat slat cleats. | 3 each |
| 2x6, 8 ftBases, arm supports, back base. | 4 each |
| 2x4, 8 ftLegs, arms, back slats. | 6 each |
| 1x4, 10 ftSeat slats. | 2 each |
| Exterior screws, #9 x 2-1/2", self-tapping | 50 each |
| Exterior pocket hole screws, 2-1/2" | 50 each |
| Exterior screws, #8 x 1-1/2", self-tappingSeat slats only. | 20 each |
| Outdoor cushions, seat and backSize before building — the frame suits standard ~24"-deep seat cushions. Not in the cost estimate. | 1 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 |
|---|---|---|
| Legs | 4 | 1 1/2" × 3 1/2" × 22" |
| Arm rests | 2 | 1 1/2" × 3 1/2" × 34" |
| Arm supports, 2x4 | 2 | 1 1/2" × 3 1/2" × 31" |
| Arm supports, 2x6 | 2 | 1 1/2" × 5 1/2" × 31" |
| Bases | 2 | 1 1/2" × 5 1/2" × 75 1/2" |
| Back rail | 1 | 1 1/2" × 3 1/2" × 75 1/2" |
| Back rest top | 1 | 1 1/2" × 1 1/2" × 75 1/2" |
| Back slats | 9 | 1 1/2" × 3 1/2" × 23 3/4" |
| Back baseThe step-6 diagram shows this wrong — 79-1/2" with 2" overhangs is correct. | 1 | 1 1/2" × 5 1/2" × 79 1/2" |
| Seat slat cleats | 2 | 1 1/2" × 1 1/2" × 79 1/2" |
| Seat slats | 10 | 3/4" × 3 1/2" × 23 1/2" |
Buy 16 boards at 8 ft.
4 boards
6 boards
3 boards
3 boards
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 →
Drill two 1-1/2" pocket holes in the top of each leg and attach to the arm rests from underneath with 2-1/2" pocket screws. The diagrams show the assembly upside down — build it that way, it's easier.
Pocket-hole both ends of the 2x4 side supports and attach between the legs, holes facing inside where they'll never be seen.
Pocket-hole each 2x6 end apron — two holes per end, plus three along one edge (those face up later, for attaching things above). Install inside the legs, flush to the outside faces, holes inward.
Pocket-hole the long 2x6 bases and the 2x4 back rail, and join the two arm assemblies into the sofa frame — all pocket holes on the insides or facing down. This is the step where the sofa gets big; work on a flat patio, not a cluttered garage floor.
Screw the 2x2 back-rest top to the nine back slats, two 2-1/2" self-tapping screws per joint.
Use the plan's spacing trick: attach the two END slats and the MIDDLE slat first, then distribute the rest evenly between them. Spacing all nine left-to-right accumulates error; anchoring the ends and middle traps it.
Screw the slat panel to the 79-1/2" 2x6 back base, keeping the same slat spacing as the top, with a 2" overhang at each end.
Note: the source diagram for this step is wrong — trust the cut list (79-1/2", 2" overhangs), not the picture.
Set the back panel inside the sofa frame: its base sits on the seat area 8" in from the back edge, screwed down with 2-1/2" screws, and the top LEANS against the frame's back rail. That lean is the recline — don't square it up.
Screw through a few of the back slats into the back rail where they touch. The back is now anchored at the bottom and pinned at the top — sit against it hard and check nothing moves.
Screw a 2x2 cleat along the back base 2x6, screws about every 12". This carries the back edge of the seat deck.
Screw the other 2x2 cleat to the inside of the front base, about 1" down from the top edge — the drop recesses the seat deck so cushions sit in the frame instead of sliding off it.
Lay the ten 1x4 seat slats across the cleats and screw down with 1-1/2" screws, one per end. Sand everything, finish it exterior-grade, add cushions, and take the first nap in something you built.
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