Build a Greenhouse: The Amazing, Low-cost, Multipurpose, Solar-heated Greenhouse/Guest House

For less than $4,000, you can build a greenhouse on this 240-square-foot plan that will also serve as a small, comfortable guest house.

build a greenhouse - Solar greenhouse roof
The roof was lifted into place with a boom truck. Note the ridge vents saddles of 2-by-4s. The metal has not yet been attached.