Glass type greenhouses are the most traditional covering used. They may be constructed with slanted sides, straight sides and eaves. Aluminum, glass buildings provide low maintenance and have aesthetic lines, as well as ensuring that you get a weather-tight structure. Pre-fabricated glass kits are available for easy installation by hobbyists and amateur gardeners. They come in different models to meet budget and space restrictions.

The disadvantages of glass are its fragile condition (glass breaks easily) and high costs.

Fiberglass

Fiberglass greenhouses - they are light, strong and hail-proof. Be careful, though. Low quality fiberglass will discolor, thus reducing penetration of light. Using a good quality fiberglass will however make it as expensive as building a glass one. If you decide to go for fiberglass, go for the most expensive grade, and do not buy colored fiberglass.

Plastic

Plastic greenhouses are becoming very popular for the following reasons:

- Low cost (about 1/6 the cost of glass)

- Absorbs sufficient heat

- Fruits and vegetables and other plants under plastic are comparable in quality to that of glass-grown varieties

- Lower tax liabilities Choice of polyethylene (PE), polyvinyl chloride (PVC), copolymers of these materials, and other readily available clear films.

Polythylene

Polyethylene: lightweight and inexpensive. It stands up well during the seasons of fall, winter and spring, but tends to deteriorate during the summer when it gets constant exposure to the sun. It breaks down due to ultraviolet rays and the deterioration begins along the rafters and along the creases. This problem can be avoided by using UV-inhibited polyethylene, which is available in two and six ml thickness and is up to 40 feet wide and 100 feet long.

PVC Polyvinyl chloride (PVC or Vinyl) - like polyethylene, PVCs are soft and flexible. You can have transparent ones. Vinyl costs two to five times more than polyethylene. When properly installed, they can last as long as five years. Because it attracts dust and dirt from the air, it has to be washed from time to time.