A greenhouse attached to an existing building is known as a

• A. Even Span Green House
• B. Lean To Greenhouse
• C. Sawtooth
• D. Quonset

Answer: (B)

A greenhouse attached to an existing building is called a lean-to greenhouse. This design uses the building’s wall as one side, giving it structural support and allowing heat from the building to help warm the greenhouse, which saves on heating. Lean-to structures are typically shallower than freestanding greenhouses and often have a single-sloped roof that runs along the wall, making them economical and space-efficient.

In contrast, an even-span greenhouse is freestanding with symmetrical bays and a central ridge, a Quonset is a curved arch shape that’s usually standalone, and a sawtooth roof is a roof pattern designed for daylight and ventilation rather than being defined by attachment to a building.