A Garden Room is a great way to add value to your home, so says property guru Phil Spencer of Location, Location, Location fame. In a recent Telegraph article, Phil says that "square footage equals money and building it is cheaper than moving house."  He endorses the idea of an extension that brings joy which he calls a 'bonus room' and suggests that having a home gym, garden office, steam room or building for a special hobby not only gives pleasure, but adds value to your property in the longer term - endorsement indeed...!