Since the beginning of the 21st Century, building professionals have faced strong demands to build, renovate and manage buildings in a way that addresses contemporary energy and environmental challenges. Based on an interdisciplinary survey of construction professionals in France by researchers from different backgrounds, this book analyzes how these actors address energy and environmental challenges. The first part of the book proposes a transversal analysis of the actual problems encountered on the ground by these construction professionals, and the levers and the resources they mobilize. It explores the dynamics of learning and transition, and the characteristics of pioneers in energy-saving and ecological construction. Through excerpts from a selection of interviews, the second part presents the professionals’ views. The aim is to allow practitioners, teachers, researchers, architecture and engineering students, and those from different disciplinary backgrounds, to benefit from feedback and self-analysis from actors, some of whom are forerunners in this field.