Dormers are commonly used to increase the usable space in a loft and to create window openings in a roof plane.
As a prominent element of many buildings, different types of dormer have evolved to complement different styles of architecture.
Today dormers are a widespread feature of pitched roof buildings.
[13] In Vancouver, there are regulations for laneway houses stating the minimum setback of the face of the dormer from the wall below, with exceptions.
[14] Dormers are popular in Ulster,[15] and commonly used to create extra space when a loft is converted into a habitable room.