It can cost anywhere from $25 to $50 per square foot to replace a composite deck. So, for a 500-square-foot deck, it would cost between $12,500 and $25,000 to replace. Keep in mind that these prices can vary based on factors such as the size of the deck, the type of composite material used, the complexity of the replacement project, and your location.

It typically costs about $25 to $35 per square foot to replace a composite deck. So, for a deck that's 500 square feet, it would cost between $12,500 and $17,500 to replace.