Because there has been an addition to the original house at the rear, known as two storey outrigger, we have advised our client to add an L-shaped dormer conversion, one dormer to be built on the rear roof and the other on the main roof, giving it the unmistakable, instantly recognisable L-shape. This type of build is a great way to get some more space out of a property like this especially if you own a mid-terrace property.