Google Home Service Ads are used by professionals such as cleaners and plumbers to promote their domestic services, often in a local catchment area. It’s similar to Google’s Local Pack, which is used to create SERP Features which present relevant local businesses in certain search results pages.
Google has shared some information about how its Home Services Ads are ranked. The factors that influence the rank include the proximity of the services provider to the web user conducting the search, the business, review score, the number of reviews of the business, and its responsiveness to customer enquiries.
Home Service Ads on Google feature the green shield with a tick within it, and the words “Google guaranteed”. This lends significant authority to a local business, making it seem more trustworthy to web users.