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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.

The least expensive way to enclose a porch is with screens. These protect the room by preventing insects from entering and, if you live in a warm climate, provide excellent airflow during hot summer months. Screens cost far less than any other alternative, so if you are against getting permits, spending too much, or enclosing your porch in walls or glass, screens are the best choice. 

A screened-in porch can add value to your home, with a potential return on investment (ROI) of 70% to 84%. The actual value added depends heavily on several factors. Climate is a major consideration; homes in warm, humid, or buggy areas (like the Southern regions) see the highest ROI. In colder climates, the value is diminished as the unconditioned space is unusable for much of the year. Other factors that influence the return include the quality of materials and construction, the size of the porch, and the local real estate market. While a screened-in porch can enhance curb appeal and attract potential buyers, it is not included in the home's total square footage for appraisal purposes.

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.