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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.

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.

In almost all cases, you will need permits if you plan on building a sunroom over your patio, but regulations and requirements will depend on your municipality. Permits to enclose your patio will usually cost between $300 and $1,000. Since navigating local building codes and zoning requirements is challenging—and the consequences of not following them can be extremely expensive—we strongly recommend hiring a sunroom builder to complete the work and pull the permits for you.

If you want to hire a professional to build a screened-in porch, a local sunroom or porch contractor is your best bet. If you can't find a local sunroom builder, another option is to consider hiring a general contractor to perform the work. 

If you're handy, you may consider building the porch yourself. Before you do so, make sure you understand the local permit requirements and building codes so that you don't have any problems with the safety or structure of the porch.