The importance of protecting significant buildings from decay and destruction would seem to be undeniable. Yet whilst the majority of buildings of merit constructed before the Second World War have been highlighted as worthy of protection there is much indifference, and in some cases hostility towards many important post-war buildings. These deserve to receive wider formal recognition but in many cases continue to be mistreated or even demolished.This book examines many of the philosophical and practical issues surrounding the conservation of modern buildings and also the problems faced by building practitioners in dealing with buildings constructed in a wider range of styles and materials than at any other time. Climate change in particular has forced change in the way in which we think about buildings, with the pressures to address issues of energy efficiency becoming more urgent and likely to have consequences that may alter the perceived architectural and historic interest of modern and traditional buildings alike.