A flat dormer is a flat-roofed three-walled structure that extends above a slanted roof. A shed dormer is a slope-roofed structure whose roof slants in the same direction as the house’s roof.

The first design concern is the size of the dormer. This primarily depends on the vertical height of your roof, from the gutter to its peak. A larger house will have a greater vertical height.

A gabled roof dormer and balcony has been built onto a flat on London Road, Westcliff along with a rear L-shaped flat roof dormer. Changes to the existing planning permission include an extension ...