In a general sense this is a difficult question to answer. A lot depends on the condition of the home you are purchasing. I have seen homes with a pool sell for less than those without one and I have also seen homes with a pool sell for as much as $20,000 more than those that don't have one. This makes your question very subjective. Homes in Henderson area are selling for quite a bit over asking price right now as our inventory is very low due to "cash" buyers, who for the most part are investors. For a variety of reasons, investors tend to want to purchase homes without a pool, so it is quite possible that you could purchase an equivalent home with a pool for less than one that has one.
If I can be of any further assistance, please feel free to call me at (702) 321-0131 or email me directly at firstname.lastname@example.org.