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The square picnic table fixes the classic table's social problem: instead of two facing rows, eight people sit around four sides, and everyone can reach the potato salad. This design carries the format on four L-shaped corner legs — each a 2x6 face-screwed to a 2x4, which makes a stout column out of flat stock — with attached seats on cantilevered supports braced by 45° diagonals.
The dimension that runs the whole build is 47-1/2". The apron lengths differ (36-1/2" between the 2x4 leg faces, 37-1/2" between the 2x6 faces) precisely so the assembled frame comes out square at 47-1/2" both ways — the plan tells you to verify it after each apron step, and you should, because the sixteen identical tabletop and seat boards only fit a frame that hit the number.
Details that matter: the seat supports are handed (22" pieces on the 2x6 leg sides, 23" on the 2x4 sides — mix them up and the seats don't line up), a pair of 13" spacer blocks sets every seat height without measuring, and the tabletop's END boards get extra screws into the aprons and leg tops because the plan makes them structural. It's a lot of screws — about 170 — and every one is doing something.
| Item | Qty |
|---|---|
| 2x6, 10 ftThe four 2x6 leg halves. | 1 each |
| 2x4, 10 ftThe four 2x4 leg halves. | 1 each |
| 2x4, 8 ftAprons, seat supports, and braces. | 6 each |
| 2x6, 8 ftThe sixteen tabletop and seat boards. | 8 each |
| Exterior screws, #9 x 2-1/2" to 2-3/4", self-tapping, star drive | 170 each |
| Exterior finish | 1 quart |
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 |
|---|---|---|
| Leg halves, 2x6From the 10-foot 2x6. | 4 | 1 1/2" × 5 1/2" × 28 1/2" |
| Leg halves, 2x4From the 10-foot 2x4. | 4 | 1 1/2" × 3 1/2" × 28 1/2" |
| Aprons between 2x4 leg faces | 2 | 1 1/2" × 3 1/2" × 36 1/2" |
| Aprons between 2x6 leg facesThe two lengths differ so the frame squares to 47-1/2" both ways. | 2 | 1 1/2" × 3 1/2" × 37 1/2" |
| Long seat supportsThese go on the 2x4 leg sides. | 4 | 1 1/2" × 3 1/2" × 23" |
| Short seat supportsThese go on the 2x6 leg sides. Handed — don't mix. | 4 | 1 1/2" × 3 1/2" × 22" |
| Diagonal bracesBoth ends 45°, parallel, long point to short point. | 8 | 1 1/2" × 3 1/2" × 18 3/8" |
| Tabletop and seat boards | 16 | 1 1/2" × 5 1/2" × 47 1/2" |
Buy 23 boards at 8 ft.
16 boards
7 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 →
Screw each 2x6 leg half to a 2x4 leg half with four screws, outside edges flush, BEST faces turned inward — the leg's inside corner is what diners' knees see. Four identical legs.
Attach the two 36-1/2" aprons between the legs' 2x4 faces, two screws per end, angling the screws slightly for better bite.
Now measure outside-of-leg to outside-of-leg: it must read 47-1/2". The plan flags this check because the tabletop boards are already cut to that number — adjust now or trim sixteen boards later.
Repeat with the two 37-1/2" aprons across the 2x6 leg faces, and verify 47-1/2" x 47-1/2" at the widest points. The two different apron lengths exist to make both directions come out equal — trust them, then verify them.
Screw each long (23") seat support to its short (22") mate per the diagram, making four L-shaped cantilever assemblies.
Cut two scrap blocks at 13" and stand them under each support while you screw it to the legs — every seat lands at identical height, zero measuring.
The handing rule: the SHORT (22") piece attaches to the 2x6 side of the leg, the LONG (23") to the 2x4 side. Dry-place all four before driving a screw.
Cut the eight braces at 45° and install each from the underside of a seat support down to the leg — screw the top connection first, then multiple screws into the leg from the inside.
The seats are cantilevers with adults on the end; these diagonals are what make that math work. All eight, no skipping.
Rack the frame until the diagonals match, then screw down the tabletop boards with even gaps.
The two END boards are structural: give them extra screws into the aprons and the tops of the legs. They tie the whole top into the frame — the middle boards just come along for the ride.
Screw the seat boards to the supports, gaps matching the top. Sand every edge a thigh will meet.
If the seats see standing (they will), the plan sketches an extra seat-bracing option — a support run between seat boards and frame. Cheap insurance on a table this social. Finish everything exterior-grade and start assigning seats.
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