While a screen enclosure in Fairfax can be beneficial in extending your living space, it is most commonly used in protecting swimming pools. The average cost of installing Fairfax screen enclosures is around $9,500. It can go as low as $1,000 and may increase significantly to $20,000 or more depending on the size and style of the enclose. Most homeowners tend to spend around $5,000 to $14,000 for their screen enclosure project. There are a lot of screen enclosures today that you can choose from. They vary in size, style, and prices.