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Building a sunroom is usually less expensive than the cost of building a home addition, but it depends on the type of sunroom. A four-season sunroom will cost more than a home addition because it’s basically a home addition with larger, more expensive windows. All other types of sunrooms will be more affordable than a home addition of an equivalent size because they don’t have insulation, heating, cooling, electrical connections, or plumbing.

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 Florida room is a home addition that has finished walls with windows lining the perimeter, while a screened-in porch, also known as an Arizona room, lacks windows and instead has screens to maintain constant ventilation. Florida rooms provide longer enjoyment throughout the year because they’re closed off and will naturally get heated from the sun, while a screened-in porch will just be the same temperature as the ambient air.

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.