Also, let me take a moment to throw this fact at you. Generally speaking, believe it or not, labor and construction materials for a smaller greenhouse could wind up costing you more for a bigger greenhouse.

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You're going to pay more per square foot for a small greenhouse than you would a larger one.

Today a prefabricated unit somewhat over 8 feet wide and 14 feet long, constructed of first-grade redwood, aluminum, and double-strength glass, costs a little less than $450.00, and this does not include the foundation.

An 8- by 10-foot lean-to, 11 feet high, costs about $300.00.

If you plan to assemble the material yourself, ask for prices on glass in box lots. Purchased this way, it costs much less, and you will have extra lights on hand in case of breakage. One of the large companies in my area sells glass in box lots for approximately 50 cents per light.

Glazing compound (putty) costs a few cents per pound.

By assembling your own materials, you can save 10 to 20 per cent of the cost of a prefabricated structure.

Upkeep and depreciation will depend on the original construction and the materials used. Greenhouses made of aluminum stand for years without seasonal replacement or repairs. Cypress and redwood, though the strongest types of wood for greenhouse use, still will show loosened screws and bolts as well as weather damage with the passage of time.

Basic Requirements

For maximum growing conditions of your plants, your greenhouse should receive ample sunlight. Your greenhouse should also afford your plants excellent air flow and ventilation. If you plan on utilizing your greenhouse all 12 months of the year, and live in a climate where temperatures drop; you're gong to need a capable system to heat the greenhouse.