To set the standard of performance high, ASHI has varying levels of certification, with full certification achieved only after an inspector has been able to pass a proctored exam and completed a minimum of 250 inspections. Have a detailed discussion with any home inspector you want to hire and find out their qualifications including training and experience. Ask for an example of a complete home inspection report prior to cutting that check so you can see how comprehensive (or not) the report will be.