Measure wall to wall in millimetres. Width is the wall you see from the front; depth runs away from you. Most modern ceilings are 2400; older houses 2700 or more.
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For the builder
Stand somewhere first. The chips at the top put you at a doorway on any side of the room, at eye height. Pick the one that matches where you walk in.



One finger on empty floor looks around. Two fingers pinch to zoom and slide to move.

Tap a placed unit to change its size, turn it, copy it, or remove it. Windows and doors slide along the walls. Wall units, the hood and the boiler sit at their usual heights — change 'Off floor' to move them up or down.