While at home testing kits are the more affordable option, there is no guarantee that the homeowner will get accurate results. Often at-home kits are not useful due to false negatives (and sometimes false positives).  Inspectors can identify the sources of the lead, rather than just a positive or negative to lead (as in the at-home testing kits).   Additionally, a lead risk assessor can educate you on managing the lead or areas of concern that you may not have considered  (such as the backyard).