How to Verify an SEO Agency's Track Record
Case studies and testimonials are marketing materials, not evidence. Here's a practical process for independently verifying whether an SEO agency actually delivers results.
Every SEO agency has case studies. They all have testimonials too. Most pick their best ones. You can't check them alone on the site. To test an agency's claims, read carefully first. A "300% traffic increase" means little. What kind of traffic is it? How long did it take? Where did it start from? Did that traffic help their business?
Check an agency's history. Don’t just look at their ads. Here’s how to do it: This method gets results.
Step one: ask for specific, verifiable client references
Ask the agency for client references. Two or three clients will do. You should talk to them directly. Current or past clients are fine. Pick ones like your industry if you can. Any real agency can give you this. If they delay, beware. Do not accept written quotes instead of calls. This is a serious warning sign.
When you speak to references, ask three things. How long have you worked with them? What metrics moved? And what do they do that you could not do yourself?
Ask the reference about results. Were they tied to revenue? Not just traffic. Traffic gains alone don't matter. Business outcomes are key.
Ask if they cleaned up tech or link problems. The agency may have caused these. Polished case studies hide such problems. This question finds them.
Step two: independently audit their own organic presence
An agency can't rank its own site. That's a red flag. Use free tools to check the agency's domain. Ahrefs, SEMrush, and Moz all have them. Look at their estimated organic traffic. See how many keywords they rank for. Check their backlink profile. Avoid agencies with weak organic presence. Stay away from those with low domain authority. Don't pick ones with spammy link profiles. They shouldn't manage your site.
This test is not foolproof. A B2B agency may win leads through relationships, not search. But it still shows whether they practice what they sell. Most strong agencies rank well for their own target terms.
Step three: request real data, not screenshot PDFs
Ask the agency for real data. Get Google Search Console or Analytics data. Make sure you have client permission. Pick a similar client project. Do not accept screenshot PDFs. They can be changed easily. Live read-only access is best. A shared export works too. These are hard to fake. Check the data.
Impression and click trends over 12+ months, not a single peak period.
What keywords moved things? Were they useful for sales? Or were they just popular but meaningless words?
Check if rankings stayed the same. Or if they spiked then dropped. A spike and drop may show bad tricks. Ask for real numbers. Not screenshots of PDFs.
The most reliable check is a client reference call. The client describes a problem that got solved. That beats a marketing quote about how great the agency is.
Step four: check for red flags in their own marketing
How an agency markets itself shows how it works. Watch for these red flags. They promise specific rankings or traffic numbers. No ethical provider does this. Their process descriptions are vague. They could mean anything. They focus on activity, not results. Like "we publish X articles" or "we build X links." Their case studies lack client names or industries.
Read how to avoid scam SEO agencies for more red flags. It goes beyond track record. Read should you trust SEO companies that guarantee rankings for details on ranking guarantees. See also: how to choose an SEO agency.
Step five: look at their client retention
Ask the agency how long clients stay with them on average. If clients leave after three or four months, be cautious. They might not meet promises. Or their work may not get results. Good agencies keep clients for years. SEO compounds over time. Clients who see results keep investing.
What if an agency won't share references or data?
Walk away. Results are easy to measure. Use Google Search Console data. Any client can get this data. They can also share it. Refusing to show proof is a red flag. It means there’s no proof. This shows results don’t exist.
How do I evaluate a new agency with limited track record?
Look at the individual practitioners. Check their years of experience. Check their public writing. Do they have published work on Moz? Or Search Engine Land? Or elsewhere that shows real expertise? Note how specific they get in your strategy talk. A new agency built by experienced people is different. It has a different risk than one built by people new to SEO.
Sources
Ahrefs - tools for auditing agency and client domain authority. ahrefs.com
Moz - on evaluating SEO providers and avoiding bad actors. moz.com
Search Engine Land - industry standards for SEO transparency and reporting. searchengineland.com
Want to know if TTGC is right for your business? We will walk you through real client data in your free Brand and Tech Assessment. No smoke, no mirrors.
Book a free Brand and Tech Assessment to see exactly how we would grow your organic visibility.
The Through The Glass Creatives Difference
There is a reason brands choose Through The Glass Creatives for work like this. It is led by Ravve Jay Prevendido, the creative director behind OWWA, Nuvia, and 100+ brands. Mherie Vic Palomo-Prevendido leads growth and brand strategy. TTGC builds a managed system that compounds. It is not a one-off project or a ticket queue. When the outcome genuinely matters, the TTGC team is built to be trusted with it. Book your free Brand and Growth Assessment.
