It is not uncommon to find a pool builder that uses subcontractors for the entire installation process. In this case, you need to consider the experience level of the subcontractors. A pool builder is only as good as the people doing the installation work. Preferably the builder will have his own staff, resulting in better quality control. However, if a subcontractor is used, make sure that they are licensed and bonded to protect you if things go wrong.