How to Write a Case Study That Wins New Clients

A case study is the most powerful piece of content a service business can publish. It demonstrates your work in context, answers the "but have you worked with businesses like mine?" question, and shows results rather than making claims. Done well, a single strong case study will influence more buying decisions than any number of generic testimonials.

Most businesses either do not have case studies or have ones so vague they are nearly useless. Here is how to write one that works.

The structure that works

A case study has three parts: the challenge, the approach, and the results. The challenge sets context — who the client is, what they were trying to achieve, and what was preventing them from achieving it. The approach explains what you did and why, without getting so technical that you lose the reader. The results show what changed — ideally with specific numbers, timeframes and the client's own words.

The client's voice is the most important element. A direct quote from the client describing the result in their own terms is more credible than anything you write about yourself. Ask for a quote specifically about outcomes: "Could you describe in your own words what changed for your business after the project?"

How to gather the information you need

Prepare six to eight specific questions for a thirty-minute call with the client. Cover: what was the situation before you worked together? What was the goal of the project? What were you most uncertain about before starting? What happened as a result? What would you say to another business considering working with us? What numbers can you share?

Ask for permission to record the call. You will get far better direct quotes from a conversation than from a written questionnaire, because people speak more naturally and reveal more detail when they are talking. Transcribe the key quotes and use them verbatim rather than paraphrasing — authenticity is the point.

What makes results credible

Specific numbers beat vague claims every time. "Website enquiries increased by 40% in the first three months" beats "we significantly improved online enquiry levels". "Google ranking moved from page 4 to position 3 for 'web design Norwich' within six months" beats "we improved search rankings". If the client can share any metric — revenue, enquiries, ranking positions, time saved — include it.

Where numbers are not available or the client prefers not to share them, qualitative descriptions of the change are still valuable. "We went from getting occasional walk-in enquiries to a steady stream of online bookings" describes a real outcome without revealing commercial figures. Honesty about what changed matters more than the precise measurement of it.

How to publish and promote the case study

Each case study deserves its own page — not a page per service with projects buried within it. A dedicated URL (/case-studies/[client-name]/ or /work/[project-name]/) gives the page authority to rank in its own right for searches like "web design for accountants Norwich" if the case study is for an accountancy firm.

Link to the case study from your relevant service pages, your homepage (rotating featured projects), and your email signature. Share it when a prospect asks if you have experience in their sector — a direct link to a relevant case study is far more effective than a generic "yes we do" response.