If you are looking for a home with the intent of adding a pool; DO NOT be fooled by the size of the yard! A large yard may seem perfect for a pool; but do not assume the area will accommodate the pool you want.
A large open area does not mean it is all available for construction. There are two items that can turn a large area into a small one. Unless the homeowner knows about them; he or she are perfect candidates for buyer's remorse!
The first thing to do when touring a house and yard is LOOK UP! Power lines can restrict pool construction based on local building codes. The power lines can require up to ten feet of clearance (called a setback) to either the water's edge for unscreened pools; or the edge of the screen structure. This can reduce the build able area substantially in yards that seem perfect for pools. A power line running from the house to the back of the lot can literally cut a twenty foot swath through the center of the yard. Usually these power lines can be moved; but there is an expense involved and can be substantial. The main trunk lines that run from pole to pole across the back of the lot are not something that can be relocated. If there are power lines at the rear of the yard or running from the house to the rear; check with the local municipality for setback requirements from the power line BEFORE you buy.
The second item to check is the Boundary Survey for the house. The reason for checking the survey is not to determine property lines (although that can be informative); the item to look for is called an EASEMENT. NOTHING can be built in an easement.
There are several types of easements. The most common is a UTILITY easement; this is in place to allow companies access to sewer, cable and power lines; and typically do not exceed ten feet. If the property is in a walled community; there can also be an easement to allow the community access to the wall.
The second most common easement is a DRAINAGE easement. There is no limit to the width and can limit the build able area substantially. The companion to this type of easement is a WETLAND SETBACK. Ironically people buy a house because it has a view of a lake or preserve; then find out the very thing that they loved about the property prohibits them from building a pool.
A homeowner will know what the build able area is for the yard by following these guidelines; and avoid turning their dream home into a nightmare.