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This is a large piece built the honest way: 2x4 frames clad in 1x boards, with four drawers hidden under the seat riding on standard 26" drawer slides. There's no joinery to speak of — it's all self-tapping screws, glue, and brad nails — but the scale is what makes it a real project. The seat frames run 102-1/2" long, so you're working with 9-foot studs and you need floor space to assemble.
The one thing you cannot fudge: the two seat frames that carry the drawers must match each other exactly. Drawer slides are unforgiving of a frame that's 1/8" out of parallel — the drawer binds or won't close flush. Build both frames on the same layout marks, check them against each other before you clad anything, and shim the slides with scrap if an opening ends up a hair wide (that's what step 13 is for).
The pipe rail across the back is decorative black iron pipe — flanges, elbows, and tees — assembled and screwed on last. Buy the fittings pre-cut to length where you can; cutting and threading pipe yourself is a separate skill and a separate set of tools. Upholster the seat with a cushion sized to the finished opening.
| Item | Qty |
|---|---|
| 2x4, 8 ftArm and drawer framing. | 4 each |
| 2x4, 9 ft (or 9 ft stud)The 102-1/2" seat and back rails come out of these. | 6 each |
| 1x8, 8 ftArm cladding and the angled back boards. | 6 each |
| 1x6, 8 ftCladding, drawer boxes, and drawer faces. | 9 each |
| 1x3, 8 ftTop trim. | 3 each |
| 1x10, 10 ftDrawer fronts/backs. | 1 each |
| 1x2, 10 ft | 1 each |
| Plywood, 1/4 in, 4x8 sheetDrawer bottoms and the back panel (if the back is against a wall). | 1 each |
| Drawer slides, 26 inFull-extension side-mount. Buy all four the same brand and model. | 4 pair |
| Self-tapping wood screws, 2-1/2 inSPAX or similar — for the 2x4 frames. | 1 box |
| Self-tapping wood screws, 2 inFor attaching frames to arms and back. | 1 box |
| Brad nails, 1-1/4 in | 1 box |
| Wood glue | 1 bottle |
| Black iron pipe fittings and nipples, 1/2 in7 flanges, 5 elbows, 2 tees, plus the cut nipples listed in the plan. Buy pre-cut/threaded lengths. | 1 set |
| Seat cushionSized to the finished seat. Foam + fabric, or a bought bench cushion. | 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 |
|---|---|---|
| Arm frame verticals2x4 | 4 | 1 1/2" × 3 1/2" × 24" |
| Arm frame long members2x4 | 4 | 1 1/2" × 3 1/2" × 31 1/2" |
| Arm end cladding1x8Plus 4 x 1x6 @ 24" to fill — mix as needed to cover the arm ends. | 16 | 3/4" × 7 1/4" × 24" |
| Arm cladding 1x61x6 | 4 | 3/4" × 5 1/2" × 24" |
| Arm top 1x61x6 | 2 | 3/4" × 5 1/2" × 36" |
| Seat frame cross members2x4 | 10 | 1 1/2" × 3 1/2" × 9" |
| Seat frame long rails2x4 | 4 | 1 1/2" × 3 1/2" × 102 1/2" |
| Back frame long rails2x4 | 2 | 1 1/2" × 3 1/2" × 102 1/2" |
| Back frame studs2x4 | 3 | 1 1/2" × 3 1/2" × 21" |
| Back panel1/4 in plywoodSplice over the center stud; two pieces 24" x 51-1/4". | 1 | 1/4" × 24" × 102 1/2" |
| Angled back boards1x8Both ends cut parallel at 15° off square, long-point to short-point. | 14 | 3/4" × 7 1/4" × 12 3/4" |
| Back retaining strip1x2Can be spliced from 8-ft stock. | 1 | 3/4" × 1 1/2" × 102 1/2" |
| Top trim1x3 | 2 | 3/4" × 2 1/2" × 102 1/2" |
| Front trim1x6 | 1 | 3/4" × 5 1/2" × 102" |
| Drawer sides1x6 | 8 | 3/4" × 5 1/2" × 23 3/4" |
| Drawer fronts/backs1x6 | 8 | 3/4" × 5 1/2" × 26" |
| Drawer bottoms1/4 in plywood | 4 | 1/4" × 23 3/4" × 26" |
| Drawer faces (wide)1x10 | 2 | 3/4" × 9 1/4" × 25 5/8" |
| Drawer faces (narrow)1x10 | 2 | 3/4" × 9 1/4" × 25 1/8" |
Some parts are longer than a 8 ft board, so there is no honest board count to show here. Open the board plan to pick a longer stock length — it names every part that does not fit.
5 boards
Build two rectangular 2x4 frames for the arms with the 2-1/2" self-tapping screws. Check each for square before the screws go tight — an out-of-square arm throws the whole sofa off.
Clad the outside faces with 1x8 and 1x6 boards using glue and 1-1/4" brad nails, then add the 1x6 trim to finish the edges. Set both arms aside.
Build the two seat frames from the 102-1/2" rails and the 9" cross members, using the 2-1/2" screws. These frames carry the drawers, so they must match each other exactly. Lay them side by side and confirm the cross-member spacing lines up frame to frame before you move on. A frame that's out of parallel means a drawer that binds later.
Build the back frame from the two 102-1/2" rails and three 21" studs, checking for square and using glue with the 2-1/2" screws.
If the sofa backs against a wall, splice the 1/4" plywood over the center stud (two pieces, 24" x 51-1/4") and attach with glue and 1-1/4" brads. If the back will be exposed to the room, leave it open for now — you'll clad it with 1x boards instead in the next step.
Stand the arms up and attach the back frame to them with the 2" screws, driving from the inside where the heads won't show. If the back is exposed, add the extra 1x cladding boards now with glue and 1-1/4" brads. Check that the whole carcass sits flat and square before the drawers go in.
Set the 15°-mitered 1x8 back boards inside the back opening and nail them down. Run the 1x2 retaining strip across the base of the back boards with glue and brads to lock them in place.
Trim the front and top edges of the whole sofa with 1x3 and 1x6 using glue and 1-1/4" brads. Fill nail holes and sand everything smooth before finishing.
Build four drawer boxes from 1x6 sides and fronts/backs with 1/4" plywood bottoms, sized to fit the openings. Mount the 26" slides so each drawer front sits flush with the front edge of the 2x4 frame. If a slide won't reach because the opening is a touch wide, block inward with scrap wood — that's normal and expected on a rough-framed carcass.
Attach the 1x10 drawer faces from inside with screws and glue, predrilling so the face doesn't split. Adjust each face for an even gap before the screws go tight.
Lay scrap 1x boards (about 23" long) across the seat frame as slats and nail them down — they carry the cushion, so they don't need to be pretty.
Assemble the black iron pipe rail from the flanges, elbows, and tees, and screw the flanges to the back to hold it. Finish the wood, then drop in a cushion sized to the finished seat opening.
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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 →