Book excerpt: This 4-colour practical guide explores how the design of interior spaces impacts wellbeing. In the built environment, this topic is generally overlooked, even though it is one of the most important topics in sustainable building. This book will enable project teams to understand how specific decisions about sustainable design and materials can be implemented on a day to day basis. Each Part ends by placing each issue into context, exploring how it is a part of sustainable design and includes practical examples. This books raises awareness of the impact interior environments have on wellbeing, and provide details and guidance on how to immediately apply the knowledge in this book to short and long term projects. It also quantifies the impacts in financial and other value terms, making this book immediately useful in a designer's day-to-day work.