The book explores how architectural, engineering and construction (AEC) firms have been adapting and changing to effectively address key environmental challenges, focusing on Life Cycle Thinking and related methodologies (Life Cycle Assessments and Life Cycle Costing). Starting from current practice, the book outlines the necessary change management to turn into life cycle AE(C) practice, switching from a product-technology mindset to a life cycle thinking and holistic approach. Although the primary audience of the book are Architectural and Engineering firms, the broad range of topics encourages readers from different backgrounds to explore the latest advancements in construction sector. Service companies and software developers can find inspiration to develop innovative tools and solutions, clients can find ways to demand sustainability as key target for building design and universities can align academic programmes to address new industry challenges.