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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. 

The cost of winterizing a screened porch can vary depending on the chosen method and the extent of the modifications required. Simple options like installing vinyl panels or using vinyl sheeting tend to be more affordable, while creating a four season room can involve higher costs due to renovation expenses. It's best to consult with professionals or obtain multiple quotes to get an accurate estimate for your specific project.

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.