Carefully consider what you will use as a building material for your new home. Locally sourced materials are best, because they have fewer road miles attached to them. Alternatively, choose materials which have been upcycled and would otherwise have been destined for the scrap yard. Wood is a good choice for an eco-home, but make sure that it comes from a sustainable source if you cannot get hold of reclaimed wood. Contrary to popular belief, properly installed wooden framed windows can actually be better insulators than their uPVC counterparts, and they last much longer as well.