Susan Roaf is famed for her approach to design and her awareness of energy efficiency. Here she reveals the concepts, structures and techniques that lie behind the realization of her ideals. By using her own house as a case-study, Roaf guides the reader through the ideas for energy efficient design or 'eco design'. Now in its fourth edition, the bestselling Ecohousecontinues to be both a technical guide and an inspiration for thousands of architects, designers and eco-builders all over the world.