How to Write Interior Design Case Studies That Win Clients

You finished the project in March. Your client teared up at the reveal and promised to tell her sister about you.

It is August. Your website still shows nine photographs and not one word from her.

In six years of running workshops for designers, I have never met one who lacked happy clients. I have met plenty who never asked those clients to say so on the record.

Here is what makes the delay expensive. Proof goes stale. Among consumers researching local businesses, 74% only care about reviews from the last three months.

The goal is not one great case study this weekend. It is a habit that runs at every project close.

Below: the interview questions, a template you can copy today, real interior design case studies, and where to put them. For the photos, see our portfolio guide.

How to earn a case study before you ever ask for one

The quality of your testimonial gets decided months before you ask for it.

Think about the last time a project went sideways on timing. Even if you fixed it beautifully, the client remembers the scramble. Clear expectations at the start let her look back on the whole thing as smooth.

Share this in your proposal, an email, or over the phone.

Here are some things you might include:

• The project phases and what they include
• How long each project phase lasts
• When they need to give feedback by
• The estimated price range of suggested items for each room
• Purchasing procedures (setting expectations for lead time)
• Clarify how you bill design work and project management (and what the difference is)
• Potential hiccups that could happen and what to expect if they occur

Then give her something she did not pay for. A treasured heirloom worked into the design. Fresh flowers on install day. A good bottle of champagne on the counter. These are the details that show up, unprompted, in the testimonial six weeks later.

Case study, testimonial, or review: what to ask each client for

These three are not interchangeable, and you probably need all of them from different people.

Match the ask to how enthusiastic the client was. Your most effusive clients get the case study request, because that one asks for their time. Everyone else gets a testimonial or a review, which takes five minutes.

• Case study – A case study is a problem/solution story (typically 500 – 900 words long) published on your site that covers why the client hired you, what problem they were facing, how you solved that problem, and the final result. You should only ask your most enthusiastic, gushing clients to participate in a case study.
• Testimonial – A testimonial means a written or video account of what it was like to work with you and whether or not they would recommend you. Most designers prefer to ask for written testimonials, but you can also ask for video testimonials if you feel that’s a fit for your brand. You could add video testimonials to your website or post them on social media.
• Review – This refers to a written review on your Google business listing, Facebook page, or other site. The benefit of these is that reviews are good for SEO. Google ranks business listings high up in Map results when they have a high amount of positive reviews.

Here’s how a DesignFiles member approaches the ask:

“Provide some sort of written summary of your process. Within that, mention that your goal is to provide 5-star service and that if you ever fall short, you want the client to tell you and you will fix it. During the process, ask the client how things are going and if there is any way you could improve the process for them. If they give accolades, save those. If they offer ways to improve, obviously acknowledge those and implement them as you can or if you cannot, tell them what you can do. Always offer something! Then make sure your offering is sufficient for them. Once the project is finished, ask for the review. You can tell them that to make the process easier, you have saved some kind words they have expressed. Make sure you reply and acknowledge the review.” – Clare Re of CDR Design

The ask that actually gets a yes

You are not imposing. Of consumers asked to leave a review, 83% did.

One designer I worked with had eleven finished projects and one line of praise on her whole site. We sent seven questions to her three strongest past clients. Two replied that week, and she had two case studies inside a month.

Four things make it land:

1. Time it right. Ask while you are celebrating the finish.
2. Make it easy. Hand her the words she already said.
3. Save the email. Write it once, reuse it.
4. Build it in. Make “request review” a task on every project.

Ask while the client is still standing in the finished room. Waiting three weeks means asking someone who has already moved on. The emotion you want in that testimonial has a shelf life, and it is shorter than you think.

Then put it to work. Our lead generation guide covers where.

How to run the interview and turn it into a case study

Publishing a case study starts with a 15-minute call. That is the whole commitment, for you and for her.

Questions you should ask

Make sure to ask them how they found out about you, why they hired you, what they were struggling with, what it was like to work with you, and whether or not they would recommend you.

Here are the best questions to ask (modify them to fit the type of service you provide):

• What challenges were you facing with the current design of your home?
• What hesitation did you have about working with me?
• What made you decide to work with me?
• Once we started working together, what was your initial reaction about the process?
• How do you feel about the completed design?
• How has this impacted your life?
• Would you recommend me to others? If so, what would you say?

Interior design case study templates you can copy

Search for an interior design case study template and you get PowerPoint decks and gated downloads. Here are three great ones for free.

Every designer I have watched publish case studies consistently uses the same skeleton. They fill in the same fields after each install instead of starting a fresh writing project.

A template does not write your case study. It stops you staring at a blank page. Fill in the six fields right after the install, while the details are fresh, and the writing takes twenty minutes instead of two months.

The six-field case study template

Fill these in the week the project wraps.

1. The client and the space. Who they are, what you started with.
2. What was not working. The frustration, in her words.
3. Why they chose you. Straight from the interview.
4. The constraint you designed around. A budget, a timeline, a wall that could not move.
5. What you did about it. Decisions, not a shopping list.
6. The result, in their words. One quote beats three paragraphs.

Field four is the one designers skip, and the one that earns the read.

The short version for projects with no professional photos

Good work with phone photos is still publishable. Do not hold a project hostage waiting on a photographer you never booked.

Use three fields instead of six: the problem, the decision, the outcome. Around 200 words is plenty. A moodboard or render from the project can carry the visual weight when photography cannot.

Publish it now at the shorter length. Upgrade it after the shoot.

The email that gets the interview booked

Keep the request short and specific. Something like this:

Hi [Name], I am putting together a short write-up of your [room or project] and would love your perspective. It is a 15-minute call, and I picked your project because [reason]. Would Tuesday at 10, or Thursday at 2, work?

Three things do the work. You named the time commitment. You told her why she was chosen. You offered two slots instead of asking when she is free.

Send one follow-up a week later, then move on.

Interior design case studies worth studying, and what each one does right

I picked these because each one solves a different problem I hear in workshops. No photos yet, a niche nobody understands, a project that went sideways, and a client who will not go on camera.

KTID’s Laurel Avenue project: structure around your process, not a formula

Kelly Taylor Interior Design organizes its Laurel Avenue case study around the firm’s real phases. Site survey, schematic design, design development, construction documents, oversight.

The takeaway: if you have a defined process, build the case study on it. The structure proves rigor before she reads about finishes.

Kate Bendewald’s Tudor Revival: pair the before shots with who the space was for

Kate Bendewald’s Tudor Revival project sets before shots of a dilapidated 1925 home beside a narrative about the blended family who bought it. They wanted it to feel collected rather than polished.

The takeaway: the story reframes every after photo. Mismatched brass and black fixtures read as a decision rather than a preference.

Allison Jaffe’s Praise page: what to publish when you have no case study yet

Allison Jaffe’s Praise page puts testimonials and press mentions together on one page.

The takeaway: this is the version you can build this week. It gives your services page something to link to while the long studies get written.

Where to put case studies so clients actually see them

A case study buried three clicks deep does nothing for you.

Create one page that indexes them all, then link out to each study. Our case studies page shows the structure. No case studies yet? A testimonials page does the same job.

Then place proof where hesitation happens. On a services page, link to the study that answers that page’s objection.

Reviews feed local search too. Our interior design SEO guide covers that.

How to use proof on a lead who has gone quiet

Waiting for social proof to work passively is how good leads go cold.

Pick the moment: a week after a paid consultation with no reply. Send one link, not five. Match it to the hesitation she voiced. Worried about project management? Send the study where the timeline held. Worried about budget? Send the one with a hard number.

Interior design case study FAQs

Start with the project you just finished

You do not need a content strategy. You need your last finished client, seven questions, and fifteen minutes on the phone.

Copy the template. Send the email. Then build the ask into your workflow so the next one runs itself.

DesignFiles is the top-rated all-in-one solution for interior designers on Capterra. Get quotes, invoicing, moodboards, 3D floor planning, purchase orders, and more. Explore all of our features.