How to Write a Case Study That Helps Close New Clients

A case study that helps close new clients tells a prospect, in concrete terms, that you have solved a problem like theirs before and how you did it. The strongest ones read like a short story with a recognisable starting point, a clear approach, honest results and a client who sounds like a real person. The weakest ones are thinly disguised adverts full of superlatives.

For service businesses, case studies are often the most persuasive content on the website, because they answer the question every buyer has: can these people actually do this for someone like me?

Choose the right projects

Pick case studies based on the clients you want more of, not just your most impressive results. A modest result for an ideal client is often more useful than a huge result in a sector you do not want to work in.

Good candidates usually have:

• A client type and problem that represent your target market.
• A clear before and after, even if the numbers are modest.
• A client willing to be named, or at least described in detail.
• Something about your approach worth explaining.

Get permission first

Always get the client’s agreement before publishing, and agree what can be shared: their name, logo, figures, quotes and photos. Some clients are happy to be named but not to share revenue numbers. Some will only allow an anonymised version. An anonymised case study can still work if it is specific about the industry, size and problem. Never invent clients, quotes or results.

Interview the client

The difference between a flat case study and a persuasive one is usually the client’s own words. A twenty-minute call is enough. Useful questions include:

• What was happening before you got in touch with us?
• What had you already tried?
• What made you choose us, and what were you worried about?
• What was working with us actually like?
• What has changed since, in your business, not just in metrics?
• What would you tell someone in your position who is considering this?

Record the call with permission. The phrases clients use to describe their problem are often better copy than anything you could write, and they help with other pages too, as explained in our guide to voice of customer research.

A structure that works

Headline built around the outcome

“How a Leeds dental practice doubled its new patient enquiries in six months” is stronger than “Case Study: Dental Practice”. Use real figures only, and include the timeframe.

The client and the situation

Who they are, what they do, and the problem they faced. Be specific enough that a similar business recognises itself.

The challenge in detail

What made the problem hard, what had been tried before, and what was at stake. This builds tension and shows you understand the situation.

What you did

Explain your approach and the reasons behind key decisions. This is where expertise shows. Avoid a long list of tasks; focus on the choices that made the difference.

Results

Be honest and precise. Show numbers where you have them, explain what they mean for the business, and mention timeframes. If some things did not work, saying so can increase credibility.

The client’s voice

A short quote or two from the interview, in their words, edited only for clarity.

A next step

Invite readers in a similar position to get in touch, with a CTA that relates to the case study. See our guide to writing calls to action.

Writing tips

• Lead with the client, not with your company.
• Use specifics: sector, size, location, numbers, timeframes.
• Keep it scannable, with clear headings and a short summary at the top for busy readers.
• Do not overclaim. If results were affected by other factors, such as seasonality or a price change, acknowledge it.
• Aim for something that can be read in three or four minutes.

Where to use case studies

Do not leave case studies on a single page nobody visits. Link them from relevant service pages, near your pricing information, in proposals, in sales emails after a first call, and in social posts. A short summary with a link often works better on a service page than the full story. Our guide to writing service pages covers where proof belongs.

If you are short on case studies, collect smaller proof in the meantime. Our article on getting and using testimonials covers how to make the most of shorter client feedback.

Want case studies that sell for you?

We help service businesses interview clients, shape their stories and write case studies that support sales rather than just sitting on a portfolio page. See our AI Conversion Copywriting service or get in touch to talk about turning your best work into proof.