Although its initial cost is normally ,000-0,000 less than a fiberglass or concrete pool, its long-term cost is often much more. With the average liner replacement costing around ,000, one can easily make up the price difference within 10-15 years after the pool's installation. Jump to Average Pool Prices - The part of the pool you swim in is called the shell. . cheap, making up only about half the cost of a basic installation. Jump to Custom Pools & Features - Spas – A hot tub is a popular feature for pools. A spa can add ,000.00 to ,000.00 to your base price. Apr 12, 2017 - The cost to install a fiberglass pool ranges between ,000 and 0,000, with most homeowners spending between 0,000 and 5,000. While this is less than the cost to put in a cement pool, the price is still significant. The final cost for a fiberglass pool project depends on a variety of factors. These ranges depend on many factors, but in general the vinyl liner pool will range from 5,000 to 0,000, the Fiberglass pool will range from 0,000 to 5,000 and the concrete pool will start around 5,000 to 0,000.