Hipped Roof Dormers.

A Hipped Dormer Conversion: Some properties have roof slopes on 3 sides. This is a hipped roof. If the staircase to your 1st floor is on the same side as the hip, it is almost impossible to take your staircase to the 2nd floor over the 1st without building a Dormer on the hip to create the headroom for the new staircase, but in some properties there is also room for a small WC or shower room.