Despite recent improvements in energy efficiency being made in new build it is important that the existing commercial building sector also take action to meet emission reduction targets. The objectives and challenges of such action will reduce the risk of the sector becoming obsolescent due to high energy use and poor environmental performance. This book presents a theory-based, practice-support methodology to deal with environmental retrofitting opportunities for existing commercial buildings in warm climates using bioclimatic design as the basis. The book has three main Sections ' Part One focuses on the context of climate change effects ' Part Two highlights the technological and behavioural contexts of the existing building sector. Policies, modelling, monitoring and trend analysis in respect to energy and environmental performance is covered here' Part Three presents the retrofitting brief as a 'design guide' for existing buildings highlighting the significance of architectural design and engineering systems for energy performance ' Part Four gives ten case studies showing the effectiveness of strategies suggested for effective environmental performanceThe book provides compelling information for all involved in the design and engineering of retrofitting projects.