An inground pool costs on average $51,625 to install a basic pool, with most homeowners spending between $36,750 to $66,500. The figure averages across the three major pool types – fiberglass, concrete and vinyl liner and is based on cost for materials for a small / average size perimeter pool. Basic pool care, increased utilities, and repairs add $2,500 to $5,000 to the annual expense of pool ownership.