£35K to £13M: A Supermarket’s A11y ROI

Okay, I need you to stay with me here, because I'm about to throw some numbers at you that are going to feel made up. They are not made up. I have checked them approximately seventeen times because I kept thinking I was reading the decimal point wrong.

According to a widely cited case study, a major UK supermarket chain partnered with a national blindness charity in the early 2000s to make their online grocery store accessible to customers with visual impairments. The reported cost of the accessibility work: £35,000. The reported resulting annual revenue from customers who had previously been completely excluded from the site: £13 million.

That is a reported 37,142% return on investment. I did the math. I did it again. I made my partner check it at the dinner table. We are all in agreement that this number is real and I am not having a stroke. Individual results will, of course, vary.

What They Actually Did

They didn't do anything mystical. They worked with the charity to audit their existing site, identify the barriers that were locking out blind and low-vision users, and then fix them. Screen reader compatibility. Proper alt text on product images. Logical heading structure. Forms that actually worked with a keyboard. The usual suspects.

The charity has a program specifically for this kind of partnership, and they were one of the early adopters. The reasoning was pretty simple: there are roughly two million people in the UK with significant visual impairments, and a big chunk of them wanted to buy groceries online. Grocery delivery is, if anything, more useful to someone with a visual impairment than to a sighted person. The retailer was leaving all of that on the table.

The Bonus Nobody Expected

Here's my favorite part of this story, and it's the part that I think gets overlooked in the "accessibility ROI" conversations. The accessible version of the supermarket's site also happened to work significantly better on the early mobile devices and slow internet connections of the era.

Semantic HTML. Lightweight markup. No reliance on JavaScript for core functionality. All the things that make a site accessible to screen readers also made it work on a basic feature phone with a GPRS connection. The retailer got early-mover advantage on mobile grocery shopping almost as a side effect of building for disabled users.

This pattern shows up over and over again. Accessibility improvements are often performance improvements. Performance improvements are often accessibility improvements. The two things are deeply linked in ways that are not obvious until you start digging.

The £13 Million Question

The obvious question is: how do you get from "we fixed the alt text" to "thirteen million pounds a year"? The answer is that you don't just get existing customers spending a bit more. You unlock an entirely new market segment that was previously inaccessible.

Disabled people in the UK have a combined spending power (the "purple pound") estimated at over £274 billion annually, according to published research. That is not a rounding error. That is a massive, largely untapped market that most e-commerce sites are actively turning away by building inaccessible experiences. Every 404 on a screen reader, every form that can't be navigated with a keyboard, every image without alt text is a customer who leaves and doesn't come back.

The retailer captured their slice of that market. The £35,000 investment wasn't charity. It was the cheapest customer acquisition campaign in the history of the company.

For the Rest of Us

The numbers are going to be smaller for you. Obviously. But the ratio scales surprisingly well. The cost of accessibility remediation is generally much lower than people expect, and the revenue impact from unlocking disabled users and improving overall usability compounds over time.

The specific figures from this case study were published by the charity and have been cited in accessibility business case documents for twenty years. While individual results will vary, the underlying logic holds up: if you're turning away customers because your site doesn't work for them, fixing that can help capture revenue you're currently missing.

The question worth asking isn't "can we afford to make this accessible?" It's "how much revenue are we currently leaving on the table every month because we haven't?"

A quick audit will tell you. You can start finding the issues right now with SCOUTb2, which can help identify potential accessibility barriers across your site, including common WCAG violations that may affect screen reader users. It takes about thirty seconds to install and run your first scan. If you want to check every page across a large site, the Pro plan handles up to 10,000 pages per scan.

They spent £35,000. You might spend considerably less. The ROI math is worth doing.

Disclaimer: This article is for informational purposes only and does not constitute legal, professional, or compliance advice. SCOUTb2 is an automated scanning tool that helps identify common issues but does not guarantee full compliance with any standard or regulation.