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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.

While there is no one size that’s considered best, the sunroom size that’s best for you will come down to the size of your home and how you want to use your sunroom. Smaller sunrooms under 120 square feet provide a nice semi-outdoor sitting area, medium-sized sunrooms between 120 and 200 square feet can house an outdoor dining area and a small area for additional seating, and large sunrooms over 200 square feet can serve multiple purposes and even include an outdoor kitchen.

Yes, a screened-in porch will increase your property taxes because it has a foundation and is considered a permanent improvement to your land. The exact amount your taxes will go up depends on the value of your existing home, the value added by the screened-in porch, the size of the structure, your location, and more.