When deciding whether to build a single-span greenhouse or a multi-span greenhouse, several issues need to be considered, including land costs, tax policies, production plans, crop types, labor force, utility costs, and construction time.
The construction investment per unit facility area of a single-span greenhouse is the lowest. However, since each greenhouse requires independent heating and ventilation equipment, the investment in the heating and ventilation system of a single-span greenhouse is higher.
When the total production area of the greenhouse exceeds 0.5 acres, the labor cost and mechanized production cost of a single-span greenhouse are usually higher than that of a multi-span greenhouse, because it is difficult to transport crops using equipment such as tracks, conveyor belts, and mobile cultivation beds in a single-span greenhouse, although it is technically feasible.
A single-span greenhouse takes up more land than a multi-span greenhouse because space must always be left between each greenhouse. If the construction land resources at the construction site are very valuable, then after planning and arranging all other necessary supporting single-building facilities, when determining the greenhouse form on the remaining construction land, the low-cost advantage of a single-span greenhouse is almost negligible compared to the land-saving advantage of a multi-span greenhouse.
If the crop production requires a high level of greenhouse environmental control and operation automation, such as producing seedlings of flower bed plants in trays, you can consider using a multi-span greenhouse.
When encountering pests or diseases, it is easy to isolate them using a single-span greenhouse.
If the site layout needs to change, a single-span plastic greenhouse is easier to relocate than a multi-span greenhouse.
Many growers have successfully used single-span greenhouses for large-scale production. Several of the largest growers in the United States, such as Harts Nursery of Jefferson in Oregon, use hundreds of single-span greenhouses to produce flower bed plants. This type of greenhouse has the advantages of simplicity, flexibility and fast construction.

