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A modular 2x4 patio sofa — build one armless seat at a time, add corner pieces, and grow it to fit your space. All exterior screws, no fancy joinery.
| Part | Qty | T × W × L | Material | ✓ |
|---|---|---|---|---|
| Seat frame, long | 2 | 1 1/2" × 3 1/2" × 24" | 2x4 | ☐ |
| Seat frame, short | 2 | 1 1/2" × 3 1/2" × 22" | 2x4 | ☐ |
| Front legs | 2 | 1 1/2" × 3 1/2" × 13 1/2" | 2x4 | ☐ |
| Back legs | 2 | 1 1/2" × 3 1/2" × 27 1/2" | 2x4 | ☐ |
| Back top rail | 1 | 1 1/2" × 3 1/2" × 25" | 2x4 | ☐ |
| Seat slats Spaced evenly so rain drains and cushions breathe. | 7 | 1 1/2" × 3 1/2" × 22" | 2x4 | ☐ |
| Seat trim | 2 | 1 1/2" × 1 1/2" × 25" | 2x2 | ☐ |
| Corner legs | 2 | 1 1/2" × 3 1/2" × 27 1/2" | 2x4 | ☐ |
| Corner top | 1 | 1 1/2" × 3 1/2" × 28 1/2" | 2x4 | ☐ |
| Corner seat and apron | 2 | 1 1/2" × 3 1/2" × 23 1/2" | 2x4 | ☐ |
| Item | Qty | ✓ |
|---|---|---|
| 2x4 board, 8 ft (Cedar or treated pine) Per armless seat. Exterior-suitable wood. | 3 each | ☐ |
| 2x2 board, 50" (Cedar or treated pine) Seat trim. | 1 each | ☐ |
| 2x4 board, 8 ft (corner) (Cedar or treated pine) Plus a 4 ft length for the corner piece. | 1 each | ☐ |
| Exterior self-tapping wood screws, 2-1/2" ~65 per seat, ~15 per corner. | 80 each | ☐ |
| Waterproof wood glue | 6 oz | ☐ |
| Exterior stain or sealer Or leave cedar to silver. | 24 oz | ☐ |
| Outdoor seat and back cushions Sized after the frames are built. | 2 each | ☐ |
Overall cost: $$. Lumber varies by region, species, and season, so we give a band rather than a figure.
Tools: Circular Saw, Drill / Driver, Speed Square. Materials: 2x4 board, 8 ft, Exterior self-tapping wood screws, 2-1/2", Waterproof wood glue
Assemble the seat frame from the long and short 2x4s, two 2-1/2" self-tapping screws per joint and exterior glue. Check it square — every later part references this frame.
Tools: Drill / Driver. Materials: 2x4 board, 8 ft, Exterior self-tapping wood screws, 2-1/2", Waterproof wood glue
Fasten the front and back legs to the frame from the inside, two screws per joint plus glue. The taller back legs form the backrest posts.
Tools: Drill / Driver. Materials: 2x4 board, 8 ft, Exterior self-tapping wood screws, 2-1/2"
Screw the top rail across the back legs with 2-1/2" screws — this sets the backrest and stiffens the whole piece.
Tools: Drill / Driver. Materials: 2x4 board, 8 ft, Exterior self-tapping wood screws, 2-1/2"
Place the two outer slats and the center slat first and screw them down, two screws per joint, then space the remaining slats evenly between them and fasten. Even gaps drain rain and let the cushions breathe.
Tools: Drill / Driver. Materials: 2x2 board, 50", Exterior self-tapping wood screws, 2-1/2"
Fasten the 2x2 trim to the seat slats and into the legs where you can reach, to finish off the end of the seat and cover the slat ends.
Tools: Drill / Driver, Random Orbit Sander. Materials: 2x4 board, 8 ft (corner), Exterior self-tapping wood screws, 2-1/2", Exterior stain or sealer, Outdoor seat and back cushions
Build the corner piece, watching which side the seat apron lands on — the corner works on either hand depending on how your sectional wraps, so set your layout first. Attach the corner to a seat module's legs with 2-1/2" screws. Sand all edges, seal or let it silver, and size cushions to the finished frames.