Patio cover
A roof built over an existing area of pavement, brick or other type of outdoor flooring. Patio covers, depending on whether they are of solid or lattice construction, can offer protection against the elements. Patio covers do not include walls.
Enclosed patio, porch or deck
A solid structure built around an existing patio porch or deck, with walls made of either glass or screen panels. It offers complete protection from the elements but is not integrated into the wiring, heating or air conditioning of a home.
New, attached sunroom added to house
A solid wall-and-roof structure made primarily of glass that provides complete protection from the elements. Sunrooms can be integrated into the wiring, heating and air conditioning of a home.