Our how to build greenhouse yourself plans designed with clear plastic windows of greenhouse annex, plus the functional vents and rear window ensure ample air and light for any use. Simple plant benches can be made to sit under the window by building perfect place for any plant. You can save hundreds of dollars by building one of our do-it-yourself plans. Greenhouse is fairly easy to build with the seams are sealed with self adhesive foam tape and covered with strips of clear plastic window that screwed to the roof frame.