This option is where the existing loft space is of insufficient size for the proposed conversion, it creates additional headroom for the staircase and new room or rooms contemplated. If an additional bathroom is proposed along with the rooms the increased height created by the Dormer provides additional height above the fittings. This one is found most popular in London, as well as feasable.
There are few dormer types:
Flat roof rear dormer
This type of loft conversion very popular in London area¬†with terrace, end of terrace and semi detached houses. Also there are most of window types can be installed including Velux / Fakro, French windows as well as doors.
Rear Dormer Conversions can usualy be undertaken through the rights of permitted deveopment, this means that planning permission may not be required. Although planning permission may not be required, all Loft Conversions should require building regulations.
Pitched Dormer Conversion This type of dormer conversion is often called a cottage dormer and is particularly suited to older properties and, unsurprisingly, cottages. Pitched dormers can be used to add character to a property. These are smaller dormers designed and constructed to be in-keeping with your property and the surrounding area. A pitched dormer can be used in place of a hip-to-gable conversion when planning permission is required.