It Pays To Do Some Research Before Hiring a Home Inspector
States have varying requirements for licensing home inspectors. Check with your state to see which companies are licensed and insured.
You can also check state websites and the Better Business Bureau for any complaints regarding a specific inspection company.
Experience matters. The longer a company or individual inspector has been in business the better. Angie's List recommends hiring an inspector who has performed a minimum of 1000 inspections and has at least 5 years of experience.
Check for industry affiliations, normally a good sign that an inspector is qualified (ASHI, InterNachi, NAHI, etc.)
Consider hiring an independent home inspector (someone not recommended by your Realtor) to avoid any possible conflict of interest.
Ask your friends and family for references. Check an inspector's references before hiring.