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A screened-in porch can add value to your home, with a potential return on investment (ROI) of 70% to 84%. The actual value added depends heavily on several factors. Climate is a major consideration; homes in warm, humid, or buggy areas (like the Southern regions) see the highest ROI. In colder climates, the value is diminished as the unconditioned space is unusable for much of the year. Other factors that influence the return include the quality of materials and construction, the size of the porch, and the local real estate market. While a screened-in porch can enhance curb appeal and attract potential buyers, it is not included in the home's total square footage for appraisal purposes.

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.

Even under the best of all circumstances, the maximum ROI on a pool is about 56%. There are other exterior home projects that you can do that are both less expensive to tackle and net a more significant ROI. These include:

• New siding installation, which can net an ROI between 70% and 80%

• Window replacement, which nets an average of over 72% ROI

• Landscaping, which at its highest can net between 200% and 400% ROI

• Garage door replacement, which nets an average ROI of 103%

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.