Timber windows have long been associated with quality and good taste, characteristics cemented by the recent uPVC backlash. In fact, research carried out by the BBC suggests that plastic replacement windows in a period property can now knock off up to £12 000 from its value. Timber is a natural insulator and can be manufactured in a staggering range of window styles, which, through advances in technology, are free from the problems once associated with it. What’s more, it’s the most environmentally friendly option, and once installed is easy to maintain.