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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.

With proper maintenance, the average life span of a screened-in porch is six to eight years for the screens themselves, but the foundation and structure can last for 50 to 100 years. To keep your screened-in porch in good shape, clean your porch screens regularly, patch holes, re-seal the wood as needed, and address any foundational issues right away.

Creating a screen room is one of the most cost-effective ways to enclose a patio so you can still use it in the winter. Most screen rooms aren’t insulated, so you’ll need to wrap up warm or use patio heaters in winter. Also, be aware they might not hold up well if you live in a location where heavy snow is common.

Your maintenance needs revolve around the type of foundation you choose, as well as how you furnish or decorate it. Patios require little else other than the occasional hose-down, but decks and other wooden structures will require annual power washing and sealing. You may also need to restain the wood every two to three years.

Adding a solid roof rather than building a pergola or leaving the space open will make maintenance much easier. Without a roof, you will need to spend more time sweeping, washing, and covering your furniture to protect it from UV bleaching.