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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.

Yes, porches require foundations. The type of foundation required, however, is determined by the type and use of the porch. For example, a screened-in porch won’t require a new cement foundation. However, if you turn your porch into a sunroom or plan on making it a living space, then chances are you need a foundation that’s more permanent than piers and posts. 

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.

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.