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How many square feet a sheet of plywood can cover depends on the size of the plywood sheet. A 4x8 sheet of plywood covers 32 square feet, while a 5x5 sheet of plywood covers 25 square feet. The cost to board up a window with plywood or install plywood under a new roof will depend on the total size of the area.

Yes, sunrooms often add some value to a home, but the amount will depend on the design of the sunroom itself. Fully insulated four-season sunrooms, for example, include enough protection from changing weather that they will be included in the total size of the home and will contribute to value accordingly. Something like an Arizona room or a solarium will also boost home value in most cases, but you’ll see a much lower return as they don’t contribute to legal living space.

An Arizona room may or may not count toward your home’s square footage, depending on local regulations and the specifics of the room, but generally does not get included in the total square footage. In many locations, a room needs to be built to the same quality as the rest of the home, have an integrated heating/cooling system, and be habitable year-round to count toward square footage. 

A solarium is built almost entirely out of glass, whereas a sunroom is built using other materials for the walls and ceiling, with some windows added to the walls and possibly a skylight in the ceiling. However, the sunroom uses significantly less glass compared to the solarium. The solarium may not hold heat as well as a sunroom when built in colder climates. A sunroom can use different materials for insulation, and heating and cooling systems can more easily supplement the energy gained from sunlight.