Google Guarantee means that you have completed Google's background checks as well as the license and insurance verification process. The Google Guarantee program is part of Google Local Services Ads. This program was created because users were gaming Google Local Services Ads while in its early stages.
The Google Guarantee helps convey trust and gives customers peace of mind knowing they are dealing with a trusted professional. Google also guarantees workmanship. For instance, if one of your clients is dissatisfied with the quality of work performed, Google will cover claims up to $2,000 (lifetime cap).