
A litter box for small spaces is a placement problem before it is a product problem. In a studio or a one-bed flat every viable location is somewhere you also sit, cook or sleep, and the temptation is to push the box into a cupboard with no airflow. That solves the view and creates the smell.
Triangular corner boxes, which use the dead diagonal space most flats waste, and tall narrow semi-enclosed boxes that trade footprint for height. Both give a cat the internal room it needs while occupying less floor. What does not work is simply buying a smaller box — undersized boxes are the leading cause of a cat eliminating beside one.
Somewhere quiet, ventilated and accessible around the clock, away from food and water. Cornell’s guidance is that cats prefer locations that are quiet, private, separate from their feeding area, and easily accessible 24 hours a day. Bathrooms and utility corners usually satisfy all four; a closed wardrobe satisfies none.
Only with genuine airflow and a permanently open access route. A cupboard with a cat flap cut into the door and a vent or gap at the top works. A cupboard that gets closed while you have visitors does not — a cat that finds its box inaccessible once will look for an alternative, and the alternative is usually soft furnishing.
Scoop twice daily rather than once, use unscented clumping litter at one to two inches, and do a full change and wash weekly. Ventilation beats containment: a semi-enclosed box in an airy corner smells less than a fully sealed box in a closed alcove, because sealing concentrates ammonia rather than removing it.
Not reliably. The one-per-cat-plus-one rule exists because a cat blocked from the only box has nowhere else to go, and two boxes side by side count as one location. In a studio, place one in the bathroom and one at the opposite end of the room — separation matters more than distance.

See the litter box furniture guide for enclosures that pass as cabinets, the covered litter box guide, or browse Litter Boxes & Scoops.
They work well in small flats precisely because they justify the box occupying visible space — a cabinet reads as furniture rather than a tray. The requirements are the same as any enclosure: internal room to turn around, an entry the cat can use easily, and enough ventilation that the interior does not hold ammonia.

Usually the best spot in a flat — ventilated, quiet and away from food. Keep the door propped open.
Good for scatter and footprint, unsuitable for seniors, kittens and any cat with joint problems.
Effectively yes — less clean litter means the usable surface is exhausted sooner.
Only if the cat can reach it at all hours in any weather. Blocked access at night causes accidents.
Marginally. Scooping frequency does far more than any device.
As far as the space allows — different room ideally, opposite corner at minimum.
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