When a buyer goes under contract on a home or commercial building, the due diligence period begins. Now it is the buyer’s chance to unearth anything that needs repair or replacement. An attorney or title company will look for defects in the title, encroaching lot lines, hidden easements, etc. Most of the time it’s a material defect that needs attention, and this can only be revealed by a knowledgeable inspector. Sometimes, even an experienced inspector can get lazy and make a mistake.