Energy efficiency and sustainable green standards have emerged in developed countries, particularly in the United States and Canada. This book explains this new direction in the construction of buildings through three parts, with illustrative examples of several types of homes: prefabricated, rehabilitated, and made with natural materials. The three R's in the construction of a home are: recycle, reduce, and reuse. The first part of this book explains how we can reduce the amount of waste. The second part is dedicated to new technologies in the house. The third part deals with ideas for alternative homes (cave houses, houses on trees, camouflage, etc).