© 2014 by John Wiley & Sons, Ltd. All rights reserved. Chapter 2 describes the drivers and barriers for adaptation. Building life cycle theory is introduced and the ways in which adaptation occurs at different stages after completion. These adaptations may occur as a result of legal, economic, physical, social and environmental drivers. The relevance of building performance theory to adaptation is explained in this chapter as well as how performance inevitably declines over time. In the context of the social, environmental and economic factors, the links between building adaptation and sustainability are then highlighted. Finally, other attributes associated with adaptation, such as physical, locational, land use and legal attributes, are d...