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In most parts of the U.S., adding a screened-in porch requires a building permit. Since this type of project often involves structural work and changes to your home’s footprint, homeowners should adhere to local guidelines. That said, permit rules can vary widely depending on where you live and how extensive the project is. Before you start sketching out plans or ordering materials, check in with your city or county’s building department to avoid headaches, fines, and potential structural issues down the line.

A screened-in porch requires maintenance to keep the screens clean and in good shape, and you may have to do some screen repair or replacement from time to time. A screen porch isn’t an all-season porch, so the weather can get in, including wind and rain.

A lanai is a covered patio with open walls, while a Florida room has sides made of mesh screens or windows, with or without partial low walls. In addition, lanais often use concrete or other patio flooring, while Florida rooms may have more indoor-style flooring like tile or wood. Both allow you to enjoy the outdoors without being in the direct sun, but a lanai doesn’t offer any barrier against insects or debris.

A sunroom may count toward your home's total square footage or living space if it meets certain conditions, which can vary by local regulations. Generally, for a sunroom to be included, it must be fully enclosed, properly insulated, and equipped with electrical access and a heating and cooling (HVAC) system, similar to a four-season room. It should also meet the same construction standards as the rest of the house. Three-season sunrooms that function more like enclosed porches typically do not count toward the total square footage and are considered exterior living space.