The free greenhouse plans below include diagrams, illustrations, photos, written building instructions, materials/tools list, and everything else you need to build your chosen greenhouse.. Building a greenhouse does not only take good construction skills, but it is also important to research the best materials to make a strong, efficient, and healthy structure for your plants. before beginning construction, you should do plenty of research on how to build a greenhouse.. Of this pdf file of greenhouses for homeowners and gardeners, nraes-137 by john w. bartok, jr. published by nraes, june 2000 this pdf file is for viewing only. if a paper copy is needed, we encourage you to purchase a copy as described below. be aware that practices, recommendations, and economic data may have changed since this book was published..