The cost really depends on the extent of the renovations, and to a lesser extent the size of your pool and your location. The best way to get an accurate price is to seek multiple quotes from pool builders in your area. That being said, the average cost is typically somewhere between $4,000 and $15,000. Minor repairs to decorative stonework or tiles might cost $1,000 or less. 2  Upgrading your filter and pump might cost $500-$1,500. 3  A new liner for a vinyl pool costs about $3,000-$5,000, including installation.