Size a kids' playhouse 7 ways: floor area by kid count, kid-height doors and windows, loft rails and ladder per CPSC guidance, full lumber takeoff, skid foundation, safety checklist, and kit vs DIY cost.
Plans about 9 sq ft of floor per child (commercial 6 × 6 ft houses are rated for 5–7 small kids).
Doors sized to ~95% of the child's height; at least 2 windows for cross-ventilation.
Guardrail and barrier heights per CPSC Publication 324; ladder at a safe 75°.
Full lumber and sheet-goods list for a gable-roof playhouse. Waste is included where noted.
4×4 skids on concrete block piers over a 4-in gravel pad — level within 1/4 in over any 8-ft run.
Auto-checked against CPSC guidance where computable — tick each item as you verify it on the real build.
DIY cost from the material takeoff at editable retail prices, compared against typical kit price bands.
Plan about 9 sq ft of playhouse floor area per child. For 3 kids that is 27 sq ft — a 4.5 × 6 ft house with 6 ft walls, comfortably fitting 3–5 children. Asking '4x6 playhouse how many kids fit'? At 24 sq ft — just under this plan — expect about 3–4 kids by the same rule. The short answer to 6x6 playhouse capacity how many children: 5–7 small kids in a commercial 6 × 6 ft house (36 sq ft).
A 6-year-old is about 45.7 in tall (CDC 50th percentile). Size the door opening to roughly 95% of child height: 44 in high × 20 in wide — easy for a child to duck through, while adults can still see inside. For kids playhouse door size inches, the answer is 44 in high × 20 in wide for a 6-year-old — easy for a child to duck through, while adults can still see inside.
At least 2, for cross-ventilation and daylight — a closed playhouse can overheat fast. The playhouse ventilation requirements kids actually face are simple: at least 2 openings so air keeps moving. For playhouse window size and ventilation, this 27 sq ft plan gets 2 windows (18 × 24 in, sill 18 in off the floor). Add roughly one window per 15 sq ft on bigger houses.
Follow CPSC Publication 324 (Outdoor Home Playground Safety Handbook): a platform 30–48 in high needs a guardrail at least 25 in high; 48–72 in needs a protective barrier at least 27 in; above 72 in, at least 33 in. At this 48 in loft, fit a guardrail at least 25 in high with openings under 3.5 in — that is the playhouse second floor safety railing for this plan.
75° from horizontal is the safe target. For a 48 in loft that works out to a 49.7 in ladder with a 12.9 in floor run and 4 rungs spaced 12 in apart. Keep the angle between 65° and 75°, and fit hand grips on any ladder steeper than 65°.
For this 4.5 × 6 ft plan (the common 4x6 size class): 7 sheets of 1/2-in 4×8 plywood — 1 for the floor deck, 4 for the walls, and 2 for the roof deck — cutting waste included. The 2x4 framing lumber list playhouse builders use: 45 pieces of 2×4 × 8 ft (studs, plates, joists, rafter stock).
This 35.2 sq ft gable roof needs 2 bundles. The playhouse shingle bundles roof area math is simple: one bundle covers about 33.3 sq ft, plus 10% waste. Add a 2×6 ridge board (7 ft) and plan one 5-lb box of exterior screws per 100 sq ft of sheathing.
Set 3 pressure-treated 4×4 skids on 9 concrete blocks — a concrete block foundation playhouse skids can bear on, with one block under each skid about every 4 ft. How many 4x4 skids for a playhouse this size? Three. How much gravel under a playhouse? A 4-in pad here (9 cu ft). Target a playhouse level tolerance quarter inch over any 8-ft run, and keep the drainage slope around playhouse walls at 1/4 in per foot away from the house.
At this 27 sq ft size, a small wooden playhouse kit price range runs $400–$800 — and usually beats retail lumber: the DIY materials list totals about $1,033 including hardware and 10% contingency. DIY pays off on bigger or custom houses — budget roughly 40 hours of build time.
For playhouse safety checklist pinch points, check hinges, ladder rungs, and rail gaps under 3.5 in first. Then: loft rails per CPSC (guardrail 25 in at 30–48 in platforms, barrier 27 in at 48–72 in, 33 in above 72 in), at least 2 windows for ventilation, ladder angle 65–75°, bolt ends protruding no more than 2 threads, the loft headroom minimum playhouse builders use (36 in — this plan has 37.6 in), and a clear 6-ft play zone around the house.
Pick 6 ft walls for a lofted house. With a 48-in loft, 6-ft walls give 37.6 in of headroom — above the 36-in minimum — while 5-ft walls drop it to about 25.6 in, too low for the loft. The playhouse roof pitch 6/12 ridge height on this 4.5-ft-wide house: 13.6 in of rise puts the ridge at 85.6 in. Five-foot walls only suit a no-loft house, where they save a little lumber.
Budget roughly 40 hours of solo build time for this 4.5 × 6 ft plan — typically 2–3 weekends with basic tools. A small wooden playhouse kit at this size goes up faster, usually a day or two with two adults, since the parts are pre-cut.
Free tool by NRTechStudio
Explore similar home improvement tools and calculators. 100% free, accurate, and runs completely in your browser without sign-up.
2 taps, no typing needed — diagnostics are sent automatically.