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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.

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. 

A sunroom offers an additional indoor space to rest, dine, or host guests, all while inviting in as much sun as possible. Either built like an enclosed porch or a fully insulated home extension, a sunroom features floor-to-ceiling windows or screens that create an open, bright design while still remaining protected from the elements and bugs.

An Arizona room may or may not count toward your home’s square footage, depending on local regulations and the specifics of the room, but generally does not get included in the total square footage. In many locations, a room needs to be built to the same quality as the rest of the home, have an integrated heating/cooling system, and be habitable year-round to count toward square footage.