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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.

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. 

Yes, adding a sunroom can increase your home's value, with a return on investment (ROI) ranging from 20% for a screen room to 50% for a three- or four-season room. The amount of value added depends on the design. Fully insulated, temperature-controlled four-season sunrooms add the most value as they can be included in the home's total living space. In contrast, simpler structures like Arizona rooms or solariums typically have a lower return as they don't count as legal living space. A high-quality sunroom can also be an attractive feature for potential buyers, especially those who enjoy gardening. The value may also be higher in warmer climates where this feature is more sought after. When deciding, consider both the potential resale value and the personal value you will get from using the room.

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.