A greenhouse is a construction made of plastic, glass or fibreglass for the cultivation and exhibition of plants. Make a decision as to what type and size you want for the greenhouse and arrange for the space needed for it. This space should receive adequate sunlight. Purchase the materials which you will use for this project such as aluminum, galvanized steel, wood, PVC, glass, fiberglass and polycarbonate - as tubular steel hoops, steel door hinges, clamps, handles UV resistant film, batten tape, heavy-duty wire and adhesives. Level the ground and Lay plastic frames on the ground securely of the size you have chosen. Measure it diagonally if you want a square greenhouse fastening it by using galvanized nails and its plates. Keep space for water pipes as necessary. Fix the frames tightly on the three sides. Use galvanized nails and adhesives and make certain that the walls are strongly connected to the base. Make sure the material gels well. Fix the roof. Cut the frames and join with the three side walls with nails and adhesives to secure it. Position the entrance frame and windows on the fourth side. Use the UV-resistant film to cover the greenhouse, the door and windows You can now position plant racks with regard to the type of plants you intend to grow in the greenhouse and how much spacing they need between them. Then finally, lay down the water pipes for its supply and disposal.