Dormer loft conversion is one of the most common type of conversion and as it is the extension of your existing roof. The shape of the dormer conversion will be a vertical slope roof and will provide additional headroom and floor space. Dormer loft is a very different kind of loft conversion that has slanted sides, it contains horizontal ceiling and vertical walls. There are many type of dormer conversions, but the flat room dormer will add up maximum amount of additional space.