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A platform bed is, structurally, a box that holds slats at the right height — and this plan refuses to complicate that. A 2x6 frame screwed at the corners, 2x2 cleats inside, short legs underneath, 1x3 slats on top. The 1x trim wrapping the outside is what elevates it: it hides the construction lumber's face and gives the frame a finished edge, with a 1x2 at the top so the trim doesn't climb past the mattress line.
The cut list here is the queen; twin through California king all ride along in the notes, and the differences are pure arithmetic — rail lengths, slat lengths, and whether a center support is required. That center 2x4 with its own legs is REQUIRED for full size and up; skipping it is how platform beds develop a permanent sag and a squeak with a rhythm.
The legs are the one aesthetic decision: 7" stubs of 2x4 or 2x6 (2x6 looks more deliberately modern), or store-bought metal feet if you want the floating look done in five minutes. Pre-sand and pre-stain the boards; a low bed frame is finished at floor level, on your knees, and future-you deserves better.
| Item | Qty |
|---|---|
| 2x6, 12 ftThe four frame rails (queen). Twin gets by on 8-footers. | 2 each |
| 2x4, 8 ftCenter support (full and up) and the bed legs — or use a 2x6 for chunkier legs. | 2 each |
| 2x2, 8 ftSlat cleats. | 2 each |
| 1x3, 8 ftSide and bottom trim. | 3 each |
| 1x2, 8 ftTop trim. | 1 each |
| 1x3 furring strips, 8 ftBed slats — 1x4s work too. Twin needs 5; king/cal-king need 10. | 7 each |
| Self-tapping screws, #9 x 2-1/2" to 3", star driveSPAX/GRK or similar. | 40 each |
| Self-tapping screws, #8 x 1-1/2" to 2", star driveTrim and slats. 1-1/2" brads substitute on trim. | 60 each |
| Wood glue | 4 oz |
| Stain or paint | 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 |
|---|---|---|
| Side railsQueen. Twin/full: 75". Cal king: 84". | 2 | 1 1/2" × 5 1/2" × 80" |
| Top and bottom railsQueen. Twin: 41", full: 57", king: 79", cal king: 75". | 2 | 1 1/2" × 5 1/2" × 63" |
| Slat cleatsMatch the side rails. | 2 | 1 1/2" × 1 1/2" × 80" |
| Center supportREQUIRED full size and up; twin omits it. | 1 | 1 1/2" × 3 1/2" × 80" |
| Side trim1x3Queen. Runs 4" past the rails to wrap the head/foot trim. | 2 | 3/4" × 2 1/2" × 84" |
| Top trim1x2Queen; matches mattress width. | 1 | 3/4" × 1 1/2" × 60" |
| Bottom trim1x3 | 1 | 3/4" × 2 1/2" × 60" |
| Bed legs2x4 or 2x6 — 2x6 reads more modern. Cut longer for a taller bed; metal feet substitute. | 4 | 1 1/2" × 3 1/2" × 7" |
| Bed slats1x3 furringQueen. Or 21 at 30" — half-length slats maximize 8-foot boards; meet over the center support. | 10 | 3/4" × 2 1/2" × 60" |
Buy 22 boards at 8 ft.
4 boards
2 boards
2 boards
13 boards
1 board
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 the 2x6 rails into a rectangle, two 2-1/2"–3" screws per corner. Square it by matching diagonals — push the long corners together until the numbers agree.
(The plan's upgrade tip: 3/4" pocket holes with 1-1/4" pocket screws make an even cleaner frame if you have the jig.)
Screw and glue the 2x2 cleats along the inside of the side rails, a screw every 8–12". Cleat height sets how deep the mattress nests in the frame — flush the cleat bottoms with the rail bottoms for the standard look.
Run the 2x4 down the middle, its TOP level with the tops of the cleats — the slats sit on both. Two screws per end.
This board is why the bed won't sag in year three. A twin can skip it; nothing wider can.
Attach the 1x3 side trim flush at the top inside edge and at the head of the bed, with the short screws or brads and glue. The 4" overhang at the foot end wraps the corner and hides the end trim's grain.
Measure your actual box (not the list) and cut the 1x2 top trim and 1x3 bottom trim. The narrower 1x2 goes at the TOP so the trim stops below the mattress line. Fasten with brads or short screws and glue.
Cut the 7" legs from 2x4 or 2x6 and attach at the corners — three screws per leg, plus glue. Taper them, or swap in metal feet, if the stub look isn't yours.
Full size and up: flip the frame and add center legs cut to fit under the 2x4 support. Measure in place; floors and lumber both lie.
Lay the slats across cleats and center support, spacing per your mattress maker's requirement (foam usually wants ≤3" gaps). Screw down with the short screws — and give the two END slats four screws each; pinning the ends is the cheap trick that takes the last wobble out of the whole bed.
If the center ever feels soft under a heavier mattress, add a second 2x4 support alongside the first with its own legs — ten minutes with the bed flipped. Sand, finish, drop the mattress in, and lose the box spring forever.
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