Sustainability, the author argues, is an integral part of architectural design and construction. For its realization, he has developed a holistic approach: a flexible timber building system that centers design on the interaction of the users of the building. The system achieves sustainable construction not only through its material, wood, but also through the flexiblity and adaptability of the residential buildings where it is applied. The book presents, analyses, and compares twelve architectural projects that demonstrate the far-reaching potential of this building system.