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Strip a platform bed down and it's a 2x4 box with legs. That simplicity is the whole appeal here: no headboard, no drawers, nothing to fuss over — just a low, solid frame that a mattress sits directly on top of.
The one detail that turns a plain box into a platform bed is the lip: a strip built up around the top edge after the main box is done, so the mattress sits down inside a shallow frame instead of perched on top of it. Get the box square before that goes on — square it by measuring corner to corner and adjusting until the diagonals match, because everything after this step just follows the shape you've already locked in.
2x3 legs keep the proportions slim; 2x4s work fine too if that's what's in your stack, and you can taper or shape the legs for a more finished look without changing anything structural.
| Item | Qty |
|---|---|
| Pine, 2x4, 8 ftMain box frame. | 3 each |
| Pine, 2x3, 2 ftLeg blocking — 2x4 offcuts work too. | 1 each |
| Pine, 2x2, 8 ftLegs. | 2 each |
| Pine, 1x3, 8 ft3 for the platform lip and footboard trim, 6 for mattress support slats — scraps work fine for the slats as long as the thickness matches. | 9 each |
| 2-1/2" screws or pocket hole screws | 1 box |
| Wood glue | 4 oz |
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 |
|---|---|---|
| Box sidesPine 2x4 | 2 | 1 1/2" × 3 1/2" × 76 1/2" |
| Box endsPine 2x4 | 2 | 1 1/2" × 3 1/2" × 39" |
| Leg blocksPine 2x32x4 works as a substitute. | 4 | 1 1/2" × 2 1/2" × 5 1/2" |
| LegsPine 2x2 | 2 | 1 1/2" × 1 1/2" × 70 1/2" |
| Platform lip, sidesPine 1x3 | 2 | 3/4" × 2 1/2" × 75" |
| Platform lip, footboardPine 1x3 | 1 | 3/4" × 2 1/2" × 44" |
| Mattress slatsPine 1x3Space evenly across the box; add more for a heavier mattress. | 8 | 3/4" × 2 1/2" × 39" |
Buy 13 boards at 8 ft.
3 boards
1 board
2 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 the 2x4 sides and ends together into a rectangle. Check it's square by measuring the two diagonals — when they match, it's square. Easy peasy, but don't skip it: this shape is what every later piece registers against.
Attach a leg block to each corner, then screw the leg to it. 2x4 works fine in place of 2x3 for the blocks. Taper the legs or add decorative feet here if you want — it's purely cosmetic at this stage.
Attach cleats along the inside of the box to carry the mattress slats, using predrilled holes and 2-1/2" screws.
Glue and screw the 1x3 lip pieces around the top outside edge of the box on the head and side rails, standing proud of the box top — this raised edge is what gives a platform bed its look and keeps the mattress from sliding off sideways.
Screw the footboard lip piece to the bottom rail with 2-1/2" screws and glue, completing the raised edge around the box.
Lay the slats across the cleats, evenly spaced, and screw each one down so it can't shift. A firmer mattress can get away with fewer, wider-spaced slats; a softer one needs them closer together.
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