How to Write a Case Study That Wins the Next Customer

Knowing how to write a case study matters more than most small businesses realise, because a case study is the only piece of marketing that answers the question a buyer is actually asking: has this person solved my exact problem before? Testimonials say you are nice. Portfolios say you can make things. A case study says you handled a situation that looks like theirs — and that is what converts hesitation into an enquiry.

Here is the structure that works.

The five parts, in order

1. The situation, described so the reader recognises themselves

Start where the customer started. Not "Client X approached us" — the actual problem, in the terms they would have used.

"A two-van plumbing firm was losing quotes because callbacks took two days. The owner was quoting in the evenings, after the work."

A reader with the same problem stops scrolling at a sentence like that. A reader without it moves on, which is also correct — this piece is not for them.

2. What made it difficult

The constraint. Budget, timing, an awkward existing system, a busy season, something that had already been tried and failed.

Skipping this is the most common mistake. Without a difficulty, the story reads as effortless, and effortless reads as either exaggerated or irrelevant to a reader whose situation is messy.

3. What you actually did

Specifically. Not "we implemented a bespoke solution" — the real steps, in order, including the boring ones.

This is the section that demonstrates competence. A reader who does not fully follow it still registers that you knew what you were doing, and a reader in the same trade evaluates you on it directly.

4. What happened

The outcome, stated as plainly as you can honestly state it.

If you have numbers and permission, use them. If you do not, describe the change in behaviour instead: "quotes now go out the same day"; "the owner stopped working evenings"; "they stopped losing jobs to whoever answered first." A concrete behaviour change is more persuasive than a vague percentage, and it is honest.

Never invent a statistic. A made-up number is the fastest way to lose a reader who knows the industry.

5. What you would tell somebody in the same position

A short, generous closing thought. It costs you nothing, it demonstrates judgement, and it is the part readers quote back to you when they call.

How to write a case study when the client will not be named

Common in small business work, and not a blocker.

Anonymise the identity, keep the specifics: "a two-van plumbing firm in the county" tells the reader everything they need. What must stay real is the shape of the problem and the work — that is where the persuasion lives.

Always ask permission before publishing anything identifiable, including photographs. And if a client declines, do not push. A single strong case study you are allowed to publish beats three you had to argue for.

The mistakes that kill case studies

Writing about yourself. "We are proud to have delivered…" The reader does not care about your pride. They care whether their problem is solvable.

No difficulty. Every real project had one. Naming it makes the whole thing credible.

Vague outcomes. "Improved efficiency" is a claim with no content. "They stopped quoting in the evenings" is a picture.

Too long. Five hundred to nine hundred words is plenty. This is a decision aid, not a report.

Only publishing the flagship project. Your biggest job is often the least relatable. Ordinary jobs that look like the reader's situation convert better.

Where to put them

One per service page, matched to that service — the strongest position, because the reader is already considering that specific thing.

A short index page listing them by problem, not by client name. Readers scan for their own situation, not for names they do not recognise.

In your replies to enquiries. "Here's a similar job we did" is the most effective single use, and it requires no traffic at all.

FAQ

How many case studies do I need?

Three or four covering your most common job types is plenty. More matters less than each one matching a situation a real buyer recognises.

What if my work is confidential?

Anonymise and keep the specifics of the problem and the work. Confidentiality restricts identity, not the shape of the story.

Should I include the price?

A range or a shape helps, if the client agrees. It filters enquiries usefully. Exact figures are usually better left out.

Can I write one for a job that partly went wrong?

Yes, and they are unusually persuasive — provided you explain what you did about it. Buyers know projects go sideways; they are choosing who handles it well.

How do I get a client to agree?

Ask right after they have said something positive, show them the draft before publishing, and offer to anonymise. Most people say yes when they can see exactly what will appear.

Want these written?

If your best proof is currently a folder of photos and a couple of testimonials, you are leaving the most persuasive asset you have unwritten.

We do this work — the interview, the structure, and the pages they sit inside. If you want a straight read on which of your jobs would make the strongest one, you can start it here.