A dormer is a structural element that protrudes from a sloped roof, typically containing a window. It is designed to create additional space and light in an upper level or attic area of a building. Dormers come in various styles, such as gabled, shed, and hipped, each offering different aesthetic and functional benefits. Dormers are commonly found in residential architecture, enhancing both the interior and exterior appearance of a home. They can improve ventilation and provide views, making them a popular choice in designs for cottages and Victorian houses. Properly constructed dormers can also increase a property's overall value.