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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 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.

A screened-in porch requires maintenance to keep the screens clean and in good shape, and you may have to do some screen repair or replacement from time to time. A screen porch isn’t an all-season porch, so the weather can get in, including wind and rain.

In most parts of the U.S., adding a screened-in porch requires a building permit. Since this type of project often involves structural work and changes to your home’s footprint, homeowners should adhere to local guidelines. That said, permit rules can vary widely depending on where you live and how extensive the project is. Before you start sketching out plans or ordering materials, check in with your city or county’s building department to avoid headaches, fines, and potential structural issues down the line.