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How to write a customer case study people actually remember
The short version
- A good case study has three parts: the problem, what changed, and the impact. Most stop at “things improved”, which nobody remembers.
- Push the impact by asking “so what?” until you reach a number, a time saving, a risk removed or a feeling.
- Write a 30-second spoken version as well as the web page. If you cannot say it out loud, it is not finished.
- Put it where buyers decide: service pages, proposals and follow-up emails, not just a case studies archive.
Quick links
Why do case studies matter so much on a small business website?
Because they are what buyers look for right before they decide. In Demand Gen Report’s 2024 Content Preferences Benchmark Survey, case studies topped the list of late-stage content B2B buyers prioritise as they finalise a decision, at 78%, ahead of webinars and analyst reports.
A case study bridges the gap between “sounds good” and “I believe this will work for me”. Your service page says what you do. The case study shows it happening to someone like the reader.
The trouble is that most small business case studies read like a project report. They describe the brief, the process and the deliverables, and they end with “the client was delighted”. That is the bit people skip.
What should a customer case study include?
Three parts, in this order, with no background waffle.
| Part | The question it answers | What good looks like |
|---|---|---|
| The problem | What wasn’t working before? | Specific and painful: slow, risky, costly or frustrating |
| The solution | What did you change or help them do differently? | The approach, not the tools |
| The impact | What tangible outcome followed? | A number, a time saving, a risk removed or a feeling |
The problem needs to be specific enough that the right reader thinks “that’s us”. Vague problems do not land. “Their website wasn’t performing” describes every website. “Enquiries had dropped to two a month and the sales team had stopped trusting the website” describes a business.
The solution should describe the shift in thinking or method that made the difference, in plain English. Nobody chooses you because of the plugin you used.
How do you make the impact land?
Ask “so what?” and keep asking. This is where almost every case study stops too early.
Stop when you hit one of these
A number, a time saving, a risk removed, or a feeling you could describe to a stranger.
Here is how it plays out on a made-up example:
- “We rebuilt their website.” So what?
- “It loads faster and is easier to use.” So what?
- “More visitors fill in the enquiry form.” So what?
- “Enquiries went from two a month to nine, and the sales team uses the site in every pitch.”
The last line is the case study. The first three are the steps to find it.
If you do not have a number, do not invent one. A named feeling works too: “for the first time, the owner was happy to send people to the website”. That is specific, true and memorable.
Here is the same ladder on a real one, from a PE-backed home energy business I worked with as fractional CMO, and cleared by the client for publication:
- “We improved their marketing.” So what?
- “Leads went up.” So what?
- “Leads rose 69% in a year, from 5,609 to 9,502, and the cost of winning each customer stayed within 5% of where it started.” So what?
- “Sales grew 28.2% year on year, in a hostile heat pump and solar market, and every quarter beat the same quarter the year before.”
The first line could be any agency. The last line could only be that business, and it is the one a board or a buyer remembers.
Why write a 30-second version as well?
Because most case studies get used in conversation, not read on a web page. If you cannot tell it out loud in 30 seconds, you will not tell it at all when a prospect asks “have you done this before?”
Use this shape:
The 30-second story
“Before working with us, ___. We helped them ___. As a result, ___.”
At a storytelling workshop I ran recently, this was the exercise that got squeezed for time, so I have rebuilt the session around it: every person now reads theirs aloud before they leave. Writing it is one skill. Saying it without waffling is another, and it only improves with practice.
Where should case studies go on your website?
On the pages where people make decisions, not only in a case studies archive nobody visits.
Try this week
- Put one short case study on each service page, matched to that service.
- Add a one-line version to your proposals and follow-up emails.
- Use the customer as the hero of the story. You are the guide who helped.
- Link each case study to the service page it proves, and back again.
Case studies also help search engines and AI assistants understand what you do and who for. A page that shows a real problem, a real change and a real result is exactly the kind of first-hand evidence they look for when deciding who to trust.
FAQ
How long should a case study be?
Long enough to cover problem, solution and impact clearly. On a service page that can be 150 words. A full case study page rarely needs more than 600.
Do I need the client’s permission?
Yes, to name them or use their logo. Without permission, describe the type of business and the change, and leave out anything identifying.
What if I don’t have hard numbers?
Use a named feeling or a before-and-after that is true and specific. Never invent figures.
Should the customer or my business be the hero?
The customer. Buyers need to see themselves in the story. You are the guide.
Is your website showing buyers the proof?
Case studies are one of the clearest trust signals a buyer looks for. If you want to see how your website scores on trust and authority, take the free E-E-A-T Website Scorecard.
