Hello, The room in question is 240cm (2.4 m) wide by 360cm (3.6m) deep. (So i made my walls these sizes the top and bottom walls are 2.4 and the left and right are 3.6)

So, roughly that is 2.4*3.6= 8.64 meters squared.

However, whenever i create a room it under estimates the room size by a ...