Everything a child is expected to put away should live below 120 cm. Above that is adult storage, whatever the catalogue photo suggests. A four-year-old reaches about 100–110 cm comfortably, a six-year-old about 125–130 cm, and any system that ignores those numbers becomes a system you maintain yourself until they leave home.

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Reach height by age
| Age | Comfortable reach | What belongs there |
|---|---|---|
| 1–2 | 60–90 cm | Board books, 2–3 soft toys, one low bin |
| 3–5 | 100–120 cm | Toy bins, picture books face-out, shoes, art supplies |
| 6–8 | 125–140 cm | Clothes rail at 120 cm, games, school bag hook |
| 9–12 | 145–160 cm | Shelves, desk storage, everything except the top shelf |
Reach is not the same as comfortable reach. Children can touch 130 cm on tiptoe but will not do it twice a day. Design for the comfortable column and put the top shelf out of scope on purpose.
Bin size decides whether it gets used
20–30 litres is the functional size for toys: light enough for a five-year-old to lift with one hand at 5–7 kg full, small enough that "tidy up" is a two-minute job rather than a life event. A 60 L box holds more and gets emptied onto the floor instead, because the child cannot see what is inside and cannot lift it back.
- One category per bin. "Cars", "Duplo", "dress-up". Mixed bins become landfill with a lid.
- Open front or no lid for daily-use bins; lidded for the rotation set.
- Front-facing labels — a picture for under-sixes, a word for over-sixes. This is the single cheapest upgrade to any storage unit.
- Rotate 6-weekly: two-thirds of the toys away, one-third out. The return of a box is genuinely a new toy, and the floor has room for it.
Books: covers out, spines in
A child who cannot read a spine cannot choose a book. Face-out display on a 60–70 cm high shelf gets used roughly three times as often as a spine-out shelf, and it holds about 12–15 picture books in 60 cm of width. Mix it: face-out at the bottom for the current favourites, spine-out above 100 cm for the rest. A 60 × 24 × 93 cm unit with three compartments and one adjustable shelf hits both, and it is still the right height when they are seven.
Drawers, hooks and the floor
Under-bed drawers want 15–20 cm internal depth. Deeper than that and the bottom layer becomes archaeology. Hooks go at 100–120 cm for coats and bags — a hook at adult height (170 cm) means the coat lives on the floor, and it is not the child's fault.
Then leave one genuinely empty surface. A 40 × 40 cm clear patch of floor or one empty shelf is where the current project lives; without it, the project lives on the bed, then the chair, then everywhere. Tidy rooms are not the ones with the most storage. They are the ones with one place for the thing that is out this week.
Safety, quickly
Anchor anything over 76 cm tall to the wall — that is ASTM F2057 territory and it applies to children's shelving as much as to dressers. Check that a storage unit's top shelf is not a climbing route: a 3-compartment unit at 93 cm is fine, a 6-cube at 145 cm next to a bed is a staircase. And keep the gap under any loft or bunk bed to the manufacturer's figure, usually 75 cm minimum, not the 60 cm that looks tidy in a photo.
Keep reading
More dimension guides are in the collection, and the full index is on the furnolio journal.
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