Go and reread the last ten reviews your business received. Not for the star rating. For the actual words people chose. We did this for a client last year — a boiler servicing firm in Harlow — and found three phrases in their Google reviews that weren't anywhere on their website, none of which we'd have guessed from a standard keyword tool.
Why Reviews Beat Keyword Tools Here
Keyword research tools show you what people type into a search box. Reviews show you how people actually describe the problem afterwards, in their own words, with no SEO training whatsoever. That gap matters more than it sounds. A customer doesn't write "boiler servicing Harlow" in a review. They write "sorted my boiler the same day it packed in during that cold snap in January," which tells you exactly what phrase to be ranking for around emergency, same-day, and seasonal cold-weather searches.
Tools are built from aggregate search data across the whole country. Your reviews are built from the specific people who already chose you, in your specific area, describing their specific problem. That's a different and frankly better dataset for a local business.
We'd argue it's underrated specifically because it doesn't feel like proper research. There's no dashboard, no export button, no graph to screenshot for a client report. It's just reading. That lack of ceremony is probably why most agencies skip it entirely and go straight for whichever paid keyword tool they've got a login for, even when the free answer was sitting in their client's Google Business Profile the whole time.
What We Found in the Harlow Example
The three phrases were "engineer who actually turned up on time," "fixed it without trying to sell me a new boiler," and "explained what he was doing instead of just doing it." None of these are keywords in the conventional sense. But they're trust signals, and trust signals absolutely get searched — often as part of longer, more specific queries like "honest boiler engineer Harlow" rather than the generic term everyone else was fighting over.
We rewrote two service pages around that honesty angle. Rankings for the broader term didn't move much. Conversion rate on those pages did, by a fair margin, because the page finally spoke to the actual hesitation customers had before booking.
Worth saying plainly: this doesn't always work. We've tried the same exercise for clients whose reviews were almost entirely generic ("great service, highly recommend") and come away with nothing usable. That's a real outcome, not a failure of the method — it just means the testimonial route won't be the one that pays off for that particular business, and the time's better spent elsewhere.
Testimonials Reveal Objections, Not Just Benefits
Most businesses write service pages around what they offer. Testimonials reveal what customers were worried about before they bought. A landscaper near Billericay kept getting reviews mentioning "didn't disappear halfway through the job like the last company." That's not flattering to read, but it's gold. It tells you the real competitor isn't another landscaper — it's the fear of being let down by one.
We folded that directly into page copy and FAQ sections. It's uncomfortable to admit your industry has a reputation problem, but ignoring it doesn't make the search behind it disappear.
Trades get this worse than most sectors. Decades of cowboy builders and vanishing roofers have left a residue of caution in how people search, and you'll see it in phrasing like "reliable," "actually shows up," and "won't take a deposit and disappear" turning up in reviews across completely unrelated trades — electricians in Maldon, roofers in Brentwood, plumbers in Witham. It's not flattering, but it's consistent enough to be worth building a page section around.
A Quick Method You Can Run Yourself
- Pull every review from the last twelve months into one document
- Highlight any phrase that describes a problem, a worry, or a specific outcome rather than a generic compliment
- Group similar phrases and check whether any already rank on your site
- Build or edit a page section around the strongest two or three groups
This takes an afternoon, not a software subscription. We've run it as part of the SEO support we offer and it's often the single highest-return hour in an entire project.
Don't restrict this to Google reviews either. Facebook comments, Trustpilot entries, even the WhatsApp messages customers send saying thanks — all of it counts as the same raw material. We once found a client's strongest phrase sitting in a thank-you email that had been forwarded to us as an aside, not submitted as part of any formal review at all.
Where This Falls Apart
It doesn't work if you've got five reviews total, obviously — there's no pattern to find in that. And it doesn't work if your reviews are mostly one-word ratings with no text, which happens a lot with businesses that only ask for stars rather than comments. If that's you, the fix isn't keyword research, it's your review request process. Ask a specific question when requesting a review ("what made you choose us over other options?") and you'll get usable text back.
It also falls apart if you only look at the five-star reviews. The three-star ones, the slightly disappointed ones, are often more useful, because they describe what almost went wrong — and that's frequently the exact worry a prospective customer is trying to resolve before they book. A review saying "took a bit longer than quoted but the result was worth it" tells you people search with timeline anxiety in mind, which you can address head-on in your copy rather than hoping nobody asks.
Testimonials Also Flag Local Language
Essex customers describe places their own way. Someone near Witham might call a job "down the Maltings end" rather than giving a postcode. Someone in Colchester might reference a specific estate or road that locals all know but a search tool never surfaces. That hyperlocal vocabulary rarely shows up in national keyword databases, but it shows up constantly in reviews, and it's often less competitive precisely because big companies never bother targeting it.
A national chain operating across fifty towns isn't going to write a page section referencing a specific estate in Colchester. They can't, practically — the content doesn't scale that way. A local business can, and that's one of the only genuine structural advantages a small operation has over a bigger competitor with a far larger marketing budget. We'd rather clients spend an hour mining this than spend the same hour tweaking a meta title by a few words.
Making This a Habit, Not a One-Off Audit
We now build a testimonial review into quarterly reporting for clients where it makes sense, treating it as part of our ongoing SEO service rather than a once-a-year exercise. New reviews bring new phrases, and customer language shifts slightly as expectations change — people started mentioning "contactless" and "no-contact quote" constantly for about eighteen months, then that vocabulary mostly vanished again.
We keep a simple running document per client now, just a spreadsheet tab, logging any new phrase that shows up more than twice in a quarter. It's unglamorous. Nobody's ever asked to see that document in a client meeting. But two or three times a year it surfaces a phrase worth a new page section, and that's a better hit rate than most of the flashier tools we've paid for over the years.
The Bottom Line
Keyword tools tell you what strangers type nationally. Your own reviews tell you what your actual customers say after they've used you, in their own words, about your specific business in your specific town. That's a free, constantly updating research source most businesses let sit unread. Twenty minutes with your last year of reviews will likely turn up something a paid tool never would, and unlike most SEO advice, you don't need to buy anything or learn any new software to try it this afternoon.
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