We get this question all the time. Here's the bottom line...
Having a swimming pool built is not cheap. If you spend $20,000 on a pool, it will not add $20,000 to the value of your home. Sadly, it may add nothing to the value of your home. Don't add a pool to your home if you expect to recoup the cost upon sale. It just doesn't work that way. Add a pool to your home because you want a pool. A pool is an outstanding investment in terms of recreation, fun, enjoyment, enhancing the appearance of your back yard and it provides great exercise. (In Phoenix, having a pool may mean being able to survive the summers comfortably!) There are dozens of great reasons to have a pool, but adding value to your home isn't one of them.
(I should note that what I say above pertains to the Phoenix area. The reason it's this way here is because so many homes have pools. In some parts of the country, a pool is rare and does add a premium to a home.)
What a pool can do is help you sell the home when the time comes. MANY people home shopping in Phoenix want a pool. We've had clients look at homes they loved but didn't buy because there wasn't a pool. Having an existing pool appeals to many home buyers. But note that there are some who don't want a pool and won't look at your house because it has one.
For more questions and answers like this, please visit The Real Estate FAQ

In the Denver metro area, if you have a pool you may have an extremely hard time selling it. I've had listings where the seller had to remove the pool in order to sell it.
Once again this proves real estate is local.
A pool is an added ammenity for entertainment, recreation & comfort purposes as well aesthetics. Family & friends enjoy the pool, especially in those very hot climates. Great for getting your daily exercise. The investment is returned in enjoyment. In Southern AZ a well cared for home with a pool is sold in short time. Old homes with old non cared pools are a hard sell. No one wants the problems. On some occasions, the pool is filled/covered in soil to complete the sale.
On average, the starting price for a high-quality fiberglass pool is around $15,000.This you may recoop over time. And the time to install is greatly reduced. Way better than the higt cost of standard concrete pools.
David