If your property's floor plan is L-shaped, or you have access to an additional section of the roof, then there is an opportunity to create an L-shape dormer. In London it's a common style for Victorian and Edwardian houses. They are built in exactly same way as a standard dormer, but with the L-shape added to increase the internal floor plan usually giving you a larger bathroom. Internally, this particular type of dormer has straight walls and a flat roof. It maximises the loft space and offers an option to create nice and airy bedrooms, spacious bathrooms and internal storage space.