This book looks at some of the major ethical ideas of the past and considers what they mean in term of how architects have shaped the built environment, and how they could be interpreted in the future. It sees in ethics the source of aesthetic decisions, and in aesthetics, the reflection of our values. While laying down a theory of architecture based on ethics, the book also has practical goals, showing how architects can make better and more beautiful buildings and more responsible, sustainable development. The book will be welcomed by a wide range of professionals and students in this vitally important yet sadly under published subject area.