Lord & Burnham Orlyt Greenhouse Product Line can be either attached to your home or outlining building or free standing.  These structures can be either a Lean-To's and Evenspans.

LEAN-TO’s

A lean-to greenhouse is a half greenhouse, split along the peak of the roof, or ridge line and has 1 line of roof vents. Lean-tos are useful where space is limited to a width of approximately seven to twelve feet, and they are the least expensive structures. The ridge of the lean-to is attached to a building using one side and an existing doorway, if available. Lean-tos are close to available electricity, water and heat. The disadvantages include some limitations on space, sunlight, ventilation, and temperature control. The height of the supporting wall limits the potential size of the lean-to. The wider the lean-to, the higher the supporting wall must be. Temperature control is more difficult because the wall that the greenhouse is built on may collect the sun's heat while the translucent cover of the greenhouse may lose heat rapidly. The lean-to should face the best direction for adequate sun exposure. Finally, consider the location of windows and doors on the supporting structure and remember that snow, ice, or heavy rain might slide off the roof or the house onto the structure.

EVENSPAN

Even-span are full-size structure that has one gable end attached to another building. It is usually the largest and most costly option, but it provides more usable space and can be lengthened. The even-span has a better shape than a lean-to for air circulation to maintain uniform temperatures during the winter heating season. An even-span, depending on the size, can accommodate two to three benches for growing crops.