Your house will have been checked and signed off in line with current Building Regulations to make sure it meets all statutory standards and in most cases will have also been inspected by the NHBC, however it is unlikely that these checks will have caught everything. The inspections carried out on your new home prior to handover are usually quick visual checks, especially if your new home is part of a larger housing development where several new build homes are being inspected and handed over at the same time.