Get the Hillside Market Sweet Pea Mini Lean-to Greenhouse Plans at Etsy for $21.98. 5. Movable Greenhouse. Use these plans, available for instant download, to fashion your own lean-to glasshouse.

One of the benefits of building a lean-to greenhouse is that you can passively heat it during the cold with heat from the structure it is attached to. 3. The Poly Hoop House .