The freestanding greenhouse has more growing space, costs more initially, and costs more to heat than an attached greenhouse. The attached greenhouse has the advantage of easy access in bad weather. It is also cheaper to heat because it shares one wall with your house. The size of a greenhouse is influenced by available space, location, intended use and cost. It should be large enough to house plant benches , a work bench and storage materials .
Larger greenhouses are easier to manage because the temperature fluctuates very slowly.
Greenhouses are made with glass , fiberglass , polyethylene, or vinyl coverings. Glass houses are very attractive, permanent, and expensive. For permanence glass is the preferred material. Fiberglass is an excellent greenhouse covering. It is lightweight, strong and practically hail proof.