A loft conversion is a process of transforming an empty attic space into a functional room, whether you are dreaming of a master suite, a guest bedroom or a home cinema. Almost all houses can benefit from this extension with a bit of basic planning. What’s more, a loft conversion can significantly add value to your property, whilst providing a brand new living space in a once forgotten part of your home. A good loft conversion can add between 10 and 20 percent to the value of a home, with no need to sacrifice the garden space required by ground-floor extensions. The good news is that you don’t need planning permission for most loft extensions. Adding up to 40 cubic meters in a terraced house, or 50 cubic meters in a detached or semi-detached house counts as permitted development.