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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 Florida room doesn’t have insulation, nor is the space heated, so in most cases, the room won’t be comfortable enough to use during the winter months. A four-season room, which is like a Florida room that’s insulated, heated, and cooled, is a better option if you’re looking to enjoy your sunroom all year long.

The cost to screen in a porch depends on whether you are adding screens to an existing structure or building a new one from scratch. Adding screens to an existing porch costs about $5 to $7 per square foot, with a national average cost of around $2,800. For example, screening a 12-by-12-foot (144-square-foot) porch would likely cost between $700 and $1,000. If you are building a new screened-in porch, the cost is substantially higher. A new 12-by-12-foot screened-in porch can cost between $6,400 and $18,300, while a new 14-by-16-foot one averages around $11,000. The final price will vary based on the size of the porch, labor costs, and the materials you choose.

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.