How to Figure Costs
Before you build, get estimates for a number of greenhouse makes and sizes. Manufacturers are glad to send you their “literature.” Builders in your own area, and elsewhere, will furnish a price list for partial or complete building. Even your lumber company will help you compute costs of a suitable structure. At the same time, ask for estimates from plumbers for heating and cooling each of the greenhouse sizes under consideration.
Before you settle for a slightly smaller size than you want, because of costs, remember that a greenhouse is an operating unit, and in the long run the cheapest to build is not always the most economical to run. Get plenty of advice. (Check garden publication advertisements and, for local firms, refer to your classified telephone directory.) Look at other greenhouses, note the complaints of the owners as well as their satisfaction. Here is a general rule to guide you: Labor and material for the small greenhouse usually run higher than for a large one. Hence, the smaller the greenhouse, the higher the cost per square foot.
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 about 12 cents per pound, and you will need approximately % pound per light.
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.
Tags: home greenhouse
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