A mansard loft conversion requires the most work to the property due to the large scale of worked needed. This type of loft conversion generally occurs through the requirement of planning permission, due to the nature of changing the roof structure so much. When a property is converted with a mansard style conversion the additional space created is tenfold, to that of a dormer loft conversion for example. The mansard has a flat roof with the back sloping inwards at 72 degrees. The reason for this is due to planning criteria as the councils view 72 degrees as a roof, rather than a wall, allowing for the build to incorporate as much space across the conversion as possible. The windows built into the loft conversion are constructed as small dormers, and are by far the most aesthetically pleasing aspect of the loft conversion. The parapet walls on either side of the conversion are also raised in brick work to match all existing aspects of the property.