Book excerpt: Unlock new growing opportunities and increase your property value with an outdoor conservatory. In this illustrated guide, Roger Marshall shows you how to build our own greenhouse using simple, easy-to-follow techniques. Covering everything from selecting a site to glazing glass, Marshall includes tips on laying a foundation, construction materials, ventilation, and much more. Whether your goal is to stretch the growing season or create a lush space for a year-round hot tub, you can build the greenhouse of your dreams.