Google’s local search algorithm weighs three primary factors: relevance, distance, and prominence. For most local service businesses, prominence is the lever you can actually pull — and reviews are the single biggest component of it.
According to multiple local SEO studies, review signals (count, velocity, diversity, and average rating) account for roughly 17% of the local pack ranking algorithm. That makes reviews the second most important factor after your Google Business Profile itself.
What the Data Shows
Businesses that consistently generate new reviews outperform competitors in local search, even when those competitors have been established longer. Here’s what matters most:
Review count matters. A business with 150 reviews will almost always outrank a similar business with 30 reviews, all else being equal. Google interprets a higher review count as a stronger signal of trust and activity.
Recency matters more than you think. A burst of reviews from two years ago is less valuable than a steady stream of recent reviews. Google wants to see that customers are actively engaging with your business right now.
Rating matters — but not as much as count. A 4.5-star rating with 200 reviews beats a 5.0-star rating with 12 reviews. Volume is king.
Responding to reviews matters. Google has confirmed that responding to reviews signals that you value your customers. It also gives Google more text to index, which can help with keyword relevance.
What This Means for Your Business
If you’re a local service business — HVAC, plumbing, dental, roofing, auto repair — your Google reviews are not just social proof. They’re a direct ranking factor that determines whether you show up when someone searches "plumber near me" or "best dentist in [your city]."
The businesses winning local search aren’t doing anything magical. They just have a system that consistently asks happy customers for reviews. That’s it.
If you don’t have a system, your competitors who do will keep pulling ahead — not because they do better work, but because they’re more visible.