The candidate must take an 80-hour state approved curriculum by a state approved provider. Then they must take a 40-hour experience-based curriculum and finally, pass the National Home Inspector Exam. This exam is a 4-hour psychrometric exam that not only tests the technical knowledge of the candidate but also is a predictor of whether they can perform as an inspector i.e., think like an inspector. Every year the licensed inspector has to do 14 continuing education hours that are approved by the state. Many licensed states have similar requirements of education, national exam and experience.