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The lightweight twin bunk: 2x4 legs, 2x6 rails, screw-only joinery designed from the start to unbolt into flat panels — because a bunk bed that can't leave the room is a problem.
| Part | Qty | T × W × L | Material | ✓ |
|---|---|---|---|---|
| Side rails Cut these first. | 5 | 1 1/2" × 5 1/2" × 75" | 2x6 | ☐ |
| End rails From the offcuts. | 6 | 1 1/2" × 5 1/2" × 41" | 2x6 | ☐ |
| Ladder-side top rail Approximate — measure and cut to fit your assembled bed. | 1 | 1 1/2" × 5 1/2" × 55" | 2x6 | ☐ |
| Legs and ladder sides 64-1/2" for the standard-height bunk. | 7 | 1 1/2" × 3 1/2" × 50 1/2" | 2x4 | ☐ |
| Ladder rungs Cut 3 for the standard-height bunk. | 2 | 1 1/2" × 3 1/2" × 18" | 2x4 | ☐ |
| Slat cleats | 4 | 1 1/2" × 1 1/2" × 75" | 2x2 | ☐ |
| Bed slats | 20 | 3/4" × 3 1/2" × 38" | 1x4 | ☐ |
| Item | Qty | ✓ |
|---|---|---|
| 2x4, 10 ft Legs and ladder. | 4 each | ☐ |
| 2x6, 10 ft Rails — cut the 75" pieces first, the 41" ends come from the offcuts. | 6 each | ☐ |
| 2x2, 8 ft Slat cleats, both bunks. | 4 each | ☐ |
| 1x4, 8 ft Twenty bed slats. | 10 each | ☐ |
| Self-tapping screws, #8 x 2-1/2", star drive Main construction — up to 3" is fine. | 100 each | ☐ |
| Self-tapping screws, #7 x 1-5/8", star drive Slats only. | 80 each | ☐ |
Overall cost: $$$. Lumber varies by region, species, and season, so we give a band rather than a figure.
Tools: Drill / Driver, Speed Square, Tape Measure. Materials: 2x4, 10 ft, 2x6, 10 ft, Self-tapping screws, #8 x 2-1/2", star drive
Screw the 41" end rails across pairs of legs with 2-1/2" screws — two rungs per bunk level. Building the standard-height version, leave 8" of clearance under the bottom rung.
Read the plan's warning twice: an assembled bunk does not fit through a doorway. If you're building in the garage, these are among the screws you'll remove later — so drive them clean and USE NO GLUE.
Tools: Drill / Driver. Materials: 2x6, 10 ft, Self-tapping screws, #8 x 2-1/2", star drive
Screw the 75" side rails to the end panels, driving at a slight angle into the legs — angled screws bite across more grain and hold better than straight ones in this joint. Keep the same clearances as the end panels.
Tools: Drill / Driver, Random Orbit Sander. Materials: 2x4, 10 ft, Self-tapping screws, #8 x 2-1/2", star drive
Screw the 18" rungs between two ladder sides — rungs spaced 14" apart on the standard height, which also gets a third rung. Ease every rung edge; this gets climbed barefoot at 6 a.m.
Tools: Drill / Driver. Materials: 2x4, 10 ft, Self-tapping screws, #8 x 2-1/2", star drive
Attach the seventh 2x4 to the back of the ladder on the side that won't meet a bed leg. The ladder ends up with doubled structure on both sides — deliberate over-building for the hardest-used part of the bed.
Tools: Drill / Driver, Tape Measure. Materials: 2x6, 10 ft, Self-tapping screws, #8 x 2-1/2", star drive
Screw the ladder to the bed from the inside. Then measure the remaining opening between ladder and end leg — around 55", but measure YOURS — cut the last 2x6 to fit, and screw it to both.
Tools: Drill / Driver. Materials: 2x2, 8 ft, Self-tapping screws, #8 x 2-1/2", star drive
Screw the 2x2 cleats flush to the bottom edges of the side rails — at least six screws per side, both bunks. Every pound of kid and mattress rides these cleats; this is not the place to economize on screws.
Tools: Drill / Driver
If the bed was built outside the bedroom: remove the end-panel screws, carry the flat panels and rails in, and rebuild in place. This is the payoff of the no-glue rule.
Tools: Drill / Driver. Materials: 1x4, 8 ft, Self-tapping screws, #7 x 1-5/8", star drive
Lay ten slats per bunk across the cleats and screw down with the 1-5/8" screws, two per end — the doubled screws stiffen the whole platform.
Then the non-negotiable: fit a guardrail to the top bunk's open sides before anyone sleeps up there. The upper side rails give you solid wood to bolt one to.