Hoop houses cost $5 to $10 per square foot. They consist of a series of half-hoops anchored into the ground, with the hoops covered in a thick, clear plastic sheet, with entryways at one or both ends also covered in thick plastic, either with a zipper, or with a wooden door frame built into the end frame. Hoop greenhouses are a budget-friendly way of quickly building and covering a substantial growing area.
Geodesic greenhouses cost $10 to $25 per square foot. Also known as dome greenhouses, these are round structures with domed tops. Geodesign greenhouses can be glazed, but to keep costs low, builders opt for a thick, stretched plastic sheet to cover them. Their round nature provides a lot of floor space and makes them able to withstand harsh winter storms, and they capture a lot of heat and light, too.
Rooftop greenhouses cost $10 to $25 per square foot and, as the name implies, they go on a flat roof. Rooftop greenhouses attach firmly to the walls or roof for extra safety, and they obviously need to be built on a flat roof. While not too common, they're an increasingly popular option in urban areas where residents can access their rooftops.
A-frame greenhouses cost $25 to $35 per square foot. A-frames are fairly simple, permanent structures. Their glass-glazed design makes them costlier than other types of greenhouses, but their shape makes them a popular option in areas with heavy snowfall. A-frame models have a steeply pitched roof, so snow and ice slide off rather than build up and cause damage.
Heated greenhouses cost $35 to $35 per square foot, on average. Plus, you'll need to pay running costs to keep the unit heated throughout the colder months. However, year-round plant growth offsets some of the increased cost.
Additionally, if you live in a cold climate, an unheated greenhouse may not be warm enough to get your seeds off to a good start—or to grow warm-climate plants, such as peppers and tomatoes.
The increased build cost comes from the need to insulate the greenhouse and install the highest efficiency glazing that you can afford. This helps reduce energy costs by more efficiently maintaining internal temperature.
Geothermal, or pit greenhouses, cost $20 to $25 per square foot. These models use the earth's constant temperature to stay warm year-round. Basically, the homeowner digs a pit in a suitably sunny location, then places a greenhouse roof over the top. This keeps the greenhouse around 10 degrees warmer than the above-ground temperature during winter. In summer, the earth acts as a heat sink, helping to keep the greenhouse temperature low enough that ventilation is often unnecessary.
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