Concrete in-ground swimming pools come in an endless variety of sizes and shapes. In part, an in-ground swimming pool's cost is based on its size, so larger, longer ones cost more than smaller, shorter ones. For example, as of July 2011, concrete 20 x 40-foot in-ground swimming pools cost about $39,000 installed. If you want a much larger pool, like a 25-yard long version, use square feet to estimate its acquisition cost.
Standard-size in-ground swimming pool costs vary from builder to builder and by region in the country. Outside of recreation centers and fitness clubs and the like, rarely are large 25-yard (75-foot) long swimming pools put into backyards. However, if you're thinking of having something like a 25-yard long swimming pool built, figure on $40 to $60 per square foot, complete. A 25 x 5-yard (15 feet) in-ground lap swimming pool, at $50 per square foot, would cost $56,250.
Often the quoted price of an in-ground swimming pool will double by the time all options, such as landscaping and decking, are added in. If a 25-yard long in-ground swimming pool is what you'd really like, you can reduce costs by building some parts of it yourself. You can also elect to build a 25-yard long swimming pool entirely on your own. Unless you have heavy equipment needed to excavate for an in-ground swimming pool, plan on contracting that activity out.
Many activities go into building any in-ground swimming pool. Really large in-ground swimming pools found at hotels and health clubs, though, are only made of concrete. All in-ground swimming pool construction begins with site preparation and excavation. Even standard-size backyard in-ground swimming pools cost anywhere from $900 to $2,500 for excavation. Excavation companies charge $50 to $200 per yard to create the hole for a swimming pool. At $200 per yard, the cost to excavate a 25-yard pool would be $5,000.
Concrete swimming pools are built on forms over which concrete is poured and shaped. In addition, concrete in-ground swimming pools feature a plaster topcoat. Concrete for a swimming pool is about $70 per cubic yard. If you need a 3-inch concrete base for your 25-yard long by 5-yard wide by 4-foot deep swimming pool, expect to pay about $26,000 dollars for concrete. Plaster topcoats for concrete swimming pools are 1/2-inch thick and are priced separately.
Cinder or concrete block in-ground swimming pools with custom-made vinyl liners make for excellent do-it-yourself (DIY) projects. An 18 x 40-foot DIY in-ground block swimming pool costs about $11,000. The Homebuilt Pools Company website says average costs for different size DIY block pools vary greatly only if they're much smaller or larger. Twenty-five-yard long DIY block swimming pools are much larger than standard size block pools, so expect to pay more than their average $11,000 price tag to build one.