For most trades and local businesses, Google Business Profile brings in more calls than any other single thing online. It's free, and getting it right is what puts you in the map results when someone searches "plumber near me".
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Set up
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Reviews
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Why Google Business Profile matters so much
When someone searches for a local service, Google usually shows a map with a handful of businesses above the normal results. Those businesses get most of the calls. Where you appear depends on how relevant your profile is to the search, how close you are, and how well known and trusted your business looks, which is where reviews come in.
A complete, accurate profile with steady reviews and a good website behind it is the most reliable way for a local business to win more of those calls.