Attached solar greenhouses are relatively inexpensive and easy to build; they can provide additional heat to homes all winter as well as fresh vegetables and flowers. This bulletin: (1) describes the characteristics of a solar greenhouse; (2) provides a checklist of five items to consider before building a solar greenhouse; (3) describes the four basic solar greenhouse components (footings, framing, glazing, and heat storage); and (4) lists step-by-step procedures for the construction of a typical greenhouse. (JN)