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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 sunroom offers an additional indoor space to rest, dine, or host guests, all while inviting in as much sun as possible. Either built like an enclosed porch or a fully insulated home extension, a sunroom features floor-to-ceiling windows or screens that create an open, bright design while still remaining protected from the elements and bugs.

A screened-in porch can add value to your home, but it won’t count toward the total square footage at an appraisal or when it comes time to sell. A screened-in porch is not fully enclosed, usable year-round, insulated, or heated or cooled, so it doesn’t meet the requirements of livable square footage in most locations.

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.