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Building this in three free-standing sections rather than one connected structure is what makes a project this large actually manageable: the front towers, the slide, and the stairs are each built and stood up on their own — heavy, but stable on their own feet — before they're ever joined together and railed off. Cutting the plywood as you go, section by section, rather than pre-cutting every part from a master list also keeps the inevitable small adjustments (a door opening that needs to shift half an inch, a window sized to a particular child's reach) from cascading into every other piece.
The slide's geometry is the one place where a small change matters a lot: the given dimensions produce a fairly fast slide, and dropping the same vertical distance over a longer slide board is what slows it down if that's a concern for a younger rider. The angled cut where the slide board meets its platform is genuinely trial-and-fit work — estimate the angle, cut it, lay it in place, and adjust before committing to fasteners.
Because this bed's railing carries a mattress and a climbing child rather than just leaning against a wall, the back railing gets bolted directly into wall studs, and the inner stair and slide railings — which see the most side-load — get L-brackets tying them down to the under-bed slats. That's not decorative hardware; it's what keeps years of climbing from working the railings loose over time.
| Item | Qty |
|---|---|
| Plywood, 3/4", 4x8 sheet | 6 each |
| Pine, 1x2, 8 ft | 11 each |
| Pine, 1x3, 8 ft | 8 each |
| Pine, 1x4, 8 ft | 7 each |
| Pine, 2x2, 8 ft | 2 each |
| Plywood, 1/8", half sheetFor the tower parapet trim — a full sheet may be needed depending on how much decorative trim is added. | 1 each |
| Pocket hole screws, 1-1/4" | 2 box |
| Finish nails, 1-1/4" and 2" | 2 box |
| Wood screws, 2" | 1 box |
| Wood glue | 6 oz |
| Eye bolts and lag bolts, for wall anchoring | 1 set |
| L-brackets | 4 each |
| Paint or stain | 1 set |
| Edge banding or trim moulding | 1 roll |
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 |
|---|---|---|
| Slide sidesPlywood, 3/4" | 2 | 3/4" × 48" × 56 1/2" |
| Slide backPlywood, 3/4" | 1 | 3/4" × 48" × 17 1/4" |
| Stairs sidesPlywood, 3/4" | 2 | 3/4" × 48" × 40" |
| Stairs backPlywood, 3/4" | 1 | 3/4" × 48" × 26" |
| Front right filler sectionPlywood, 3/4"Extends the front to fit a twin mattress. | 1 | 3/4" × 48" × 2 1/4" |
| Front middle sectionPlywood, 3/4"Door opening cut roughly 22" wide x 38" high, centered. | 1 | 3/4" × 48" × 47" |
| Tower front, narrowPlywood, 3/4" | 1 | 3/4" × 60" × 11" |
| Tower front, widePlywood, 3/4"Gets the window seat cutout, about 4-1/2" x 7-1/2" windows with 1" between, rounded tops. | 1 | 3/4" × 60" × 18" |
| Tower sidesPlywood, 3/4" | 4 | 3/4" × 60" × 10" |
| Top stair treadPlywood, 3/4" | 1 | 3/4" × 24 1/2" × 15" |
| Lower stair treadsPlywood, 3/4" | 2 | 3/4" × 24 1/2" × 11 1/4" |
| Top stair supportPlywood, 3/4" | 1 | 3/4" × 24 1/2" × 29 1/4" |
| Middle stair supportPlywood, 3/4" | 1 | 3/4" × 24 1/2" × 19 1/4" |
| Bottom stair supportPlywood, 3/4" | 1 | 3/4" × 24 1/2" × 9 1/4" |
| Slide platformPlywood, 3/4" | 1 | 3/4" × 15 3/4" × 13" |
| Slide panelMelamine-faced plywood, 3/4"Melamine's slickness genuinely matters here — cut a little long and trim the angled top to fit. | 1 | 3/4" × 15 3/4" × 57" |
| Slide platform supportPlywood, 3/4" | 1 | 3/4" × 15 3/4" × 41 1/4" |
| Slide bottom supportPlywood, 3/4" | 1 | 3/4" × 15 3/4" × 7 5/8" |
| Tower seat and shelfPlywood, 3/4" | 2 | 3/4" × 16 1/2" × 10" |
| Tower shelvesPlywood, 3/4" | 4 | 3/4" × 9 1/2" × 10" |
| Upper stair step supportsPine 1x2 | 4 | 3/4" × 1 1/2" × 14 1/4" |
| Lower stair step supportsPine 1x2 | 8 | 3/4" × 1 1/2" × 10 1/2" |
| Slide rail supportsPine 1x2 | 2 | 3/4" × 1 1/2" × 54" |
| Slide platform support sidesPine 1x2 | 2 | 3/4" × 1 1/2" × 11 1/2" |
| Slide platform support, lowerPine 1x2 | 2 | 3/4" × 1 1/2" × 12 1/4" |
| Slide platform support, rearPine 1x2 | 1 | 3/4" × 1 1/2" × 15 3/4" |
| Railing, outside stairsPine 1x4 | 2 | 3/4" × 3 1/2" × 15 7/8" |
| Railing, inside stairsPine 1x4Two runs of this length — one for the inside stairs, one for the inside slide. | 4 | 3/4" × 3 1/2" × 25" |
| Railing, front centerPine 1x4 | 2 | 3/4" × 3 1/2" × 47" |
| Railing, front rightPine 1x4 | 2 | 3/4" × 3 1/2" × 2 1/4" |
| Railing, backPine 1x4 | 2 | 3/4" × 3 1/2" × 115 3/4" |
| Railing slatsPine 1x2 or 1x3Spaced about 3" apart between the top and bottom railing runs. | 56 | 3/4" × 1 1/2" × 11 1/2" |
| Mattress support railsPine 2x2 | 2 | 1 1/2" × 1 1/2" × 77 1/2" |
| Mattress support slatsPine 1x3Spaced about 2-1/2" apart for adult-safe support. | 16 | 3/4" × 2 1/2" × 40" |
| Tower cap trimPine 1x4Plus one at 12-1/2" and one at 19-1/2" — sits about half proud of the tower tops. | 6 | 3/4" × 3 1/2" × 10 3/4" |
| Tower parapet trimPlywood, 1/8"Cut a castle-notch pattern along one edge, sized to each tower's width. | 6 | 1/8" × 6" × 11" |
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.
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4 boards
Rather than cutting every piece from a master list up front, work in sections: build the front towers first, then the slide, then the stairs, cutting plywood as you go. Each section stands on its own — and is heavy — before being joined to the others.
Connect the tower sides to the tower fronts (the narrow and wide panels) with pocket holes and 1-1/4" screws, keeping the sides attached to the backs of the fronts so the towers land at their full widths. Cut the door in the front-middle section — about 22" wide by 38" high, drawn with pencil first and cut with a jigsaw — then connect the middle section to the two towers, flush at the backs. Cut the window-seat openings in the wider tower, each about 4-1/2" x 7-1/2" with 1" between them, rounded at the top.
Add the narrow front-right filler section to the end of the front assembly so the whole front is long enough for a twin mattress.
Take the two slide sides and the slide back and attach the slide platform support to one side, about 12-1/4" from the back — do this before joining all three panels, since the space gets tight to work in afterward. Attach the 1x2 slide-rail supports along the layout line running from the front of the platform support to the front of the bottom support, on each side, then join all three panels together.
Optionally cut a curved profile into the outer and inner slide walls for an open look, drawn by hand and cut with a jigsaw. Cut closet openings underneath the slide the same way — this reclaims the otherwise wasted space below.
Attach the slide platform to its supports. Cut the slide panel — melamine-faced plywood if you can get it, since the slick surface makes a real difference — trimming the top at an angle by trial fit until it sits snugly against the platform. Countersink screws up from underneath into the supports to fasten the slide down.
Attach the stair sides to the stair back the same way as the slide box. Attach the 1x2 step supports to both sides at the top and bottom of each step location, and attach the top, middle, and bottom stair-support panels at this stage as well.
Attach the treads to the tops of their supports. Optionally trim the outer stair edge for a cleaner look, finishing the cut edge with a 1x2 on its side as a rail. Cut closet openings underneath the stairs, same as under the slide.
Attach the front, slide, and stair sections together. Build the railings from 1x4 top and bottom rails with 1x2 vertical slats spaced about 3" apart, cutting each run to its own measured length — measure the actual gaps rather than trusting the plan's numbers exactly, since small variations add up. Bolt the back railing into wall studs for real load support, and add L-brackets from the inner stair and slide railings down to the under-bed slats, since these two runs see the most side-load from climbing.
Attach the 2x2 mattress support rails to the front of the back railing and the inside front of the bed, flush with the bottom of the railings, using 2" screws and glue. Screw down the mattress support slats about 2-1/2" apart across the rails for real weight-bearing support.
Attach the tower cap trim pieces to the outside tops of the towers, about 1-3/4" proud of the tower tops. Cut the 1/8" plywood parapet strips with a castle-notch pattern along one edge, sized to fit behind the cap trim, and nail them in place.
Apply edge banding or trim moulding to raw plywood edges. Paint or stain the whole bed. Add any decorative touches — a shaped plywood peak over one tower, a shaped front panel above the railings, painted base moulding, and wall decals if desired.
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2 boards
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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 →