An extension can run along the full length of the side return of a house or along part of the length, as in this picture, leaving a summer garden, court yard or small outside area. The small courtyard area allows the back window of the house to be left as is, allowing more light into the back of the house. It also creatures an interesting feature and maintains the integrity of any original features at the back of the house. Running an extension along the full length of the side return has the advantage that a larger new floor area is created.