Do you offer the type of pool that I want (fiberglass, concrete/gunite, vinyl liner) and how much experience do you have with installing that type of pool?
Most inground pool builders specialize in one of the three types of pools. A builder that is an expert in installing concrete pools may not necessarily be an expert in installing fiberglass pools. Find out how many of the same type of pools the builder has installed. If you are having accessories such as a deck, spa or landscaping done with the same builder, make sure that they have done that type of work in the past with other clients.