Can you connect two floors by stealing little space to the house? When you need to insert a small but functional scale it is easy to think of a rounded spiral staircase. In fact, it is preferable to design a square or rectangular hole since the space in the corners remains more exploitable and the passage is so much easier. The minimum footprint is 1.20 m for 1.20 mt. Of course, for greater convenience, it is necessary to increase the size of the compartment. As an alternative to a square or rectangular square spiral staircase, it is possible to realize a small U-type staircase. The latter differs from the spiral staircase in the rotation development, so it is not necessary to make a full turn to reach the plane Superior.