Accessibility Maintenance: Keeping a Site Usable

Most conversations about web accessibility focus on the launch. A team builds a site, runs it through a checker before going live, ticks the box, and moves on. What this overlooks is that accessibility is not a state you achieve once and keep forever. It is a quality that erodes quietly as your website changes. New blog posts are published without descriptive image text, a redesigned button loses its colour contrast, a plugin update breaks keyboard navigation, and slowly a site that was usable for everyone becomes usable only for some.

This guide is about the ongoing work of keeping a website accessible, written for business owners rather than specialists. We will explain what accessibility actually means in practice, why it drifts over time, the small set of checks that catch most problems, and how to fold accessibility maintenance into your normal routine without it becoming a burden. The aim is to give you a realistic, sustainable way to make sure your site keeps working for the widest possible audience.

What accessibility really means

Web accessibility means designing and maintaining a site so that people with a wide range of abilities can use it. That includes people who are blind or have low vision and rely on screen readers, people who cannot use a mouse and navigate with a keyboard or other assistive device, people with hearing differences who need captions, people with cognitive differences who benefit from clear and predictable layouts, and people with temporary or situational limitations such as a broken arm or bright sunlight on a phone screen. Accessibility is not a niche concern for a small group; it touches a large portion of every audience at some point.

The most widely referenced standard in this area is the Web Content Accessibility Guidelines, usually shortened to WCAG and published by the W3C. WCAG organises its guidance around four principles, often remembered by the acronym POUR: content should be perceivable, operable, understandable, and robust. You do not need to memorise the entire standard. What helps is understanding that these principles describe the experience you are aiming for, and that most practical fixes map back to one of them.

Why accessibility drifts over time

If you only ever audit accessibility at launch, you are measuring the site at the single moment it is least likely to have problems. From that point on, every change is an opportunity for regression. The most common source of drift is content. Each time someone publishes a page or post, they make dozens of small decisions that affect accessibility, such as whether to add alternative text to an image, how to structure headings, and whether to describe a link clearly or leave it as "click here". Multiply that across hundreds of pages and several contributors, and the cumulative effect is significant.

Design and code changes cause drift too. A brand refresh might introduce a lighter grey for body text that no longer meets contrast requirements. A new interactive component might look beautiful but be impossible to operate without a mouse. A theme or plugin update can silently change the underlying markup so that a screen reader announces things in the wrong order. None of these are dramatic events, which is exactly why they go unnoticed. They are the slow accumulation of small regressions, and the only reliable defence is regular checking.

The cost of ignoring it

Beyond the clear ethical case for not excluding people, there are practical reasons to care. Accessible sites tend to be better structured, which often helps search engines understand them too. They are more usable for everyone, because clear navigation and good contrast benefit all visitors, not only those with specific needs. And in many places, accessibility is increasingly an expectation rather than an optional extra. Treating it as routine maintenance is far cheaper than treating it as an emergency remediation project later. For a deeper introduction to the fundamentals, our web accessibility basics guide is a good starting point.

The checks that catch most problems

You do not need specialist training to catch the majority of accessibility issues. A small number of recurring checks address the problems that appear most often. The first is text alternatives for images. Every meaningful image should have alternative text that conveys its purpose, while purely decorative images should be marked so assistive technology can skip them. This single habit, applied consistently as you publish, prevents one of the most widespread issues on the web.

The second is colour contrast. Text needs enough contrast against its background to be readable by people with low vision or anyone using a screen in poor lighting. Free contrast checkers let you paste in two colours and tell you instantly whether they pass. The third is keyboard navigation. Try using your site with only the keyboard, pressing Tab to move between links and form fields. If you cannot reach or activate something, or if the focus indicator disappears, that is a real barrier for many users. The fourth is heading structure, where headings should form a logical outline rather than being chosen purely for visual size.

Automated tools and their limits

A range of automated accessibility checkers can scan your pages and flag issues. These tools are genuinely useful and should be part of your routine, because they catch many problems quickly and consistently. Running an automated scan across your key pages on a regular schedule is one of the highest-value habits you can adopt. Some tools integrate directly into the browser, others run as part of a build process, and many will produce a prioritised list of issues to work through.

That said, automated tools have real limits, and it is important to understand them. They are good at detecting things that can be measured mechanically, such as missing alt attributes or insufficient contrast ratios. They are poor at judging things that require human understanding, such as whether alt text is actually meaningful, whether the reading order makes sense, or whether a custom widget is genuinely operable. Studies of these tools consistently find that they catch only a portion of all issues. The practical conclusion is that automated testing is necessary but not sufficient, and it should be paired with periodic manual checks.

Building accessibility into your routine

The most effective approach is to make accessibility a normal part of how content is created and how the site is maintained, rather than a separate audit you dread. On the content side, give anyone who publishes a short, practical checklist: add alt text to meaningful images, use proper headings, write descriptive link text, and add captions to video. These become second nature quickly, and they prevent the steady accumulation of new problems at the source.

On the maintenance side, schedule a periodic accessibility review in the same way you schedule other upkeep. A quarterly automated scan of your main pages, combined with a manual keyboard run-through and a check of any new templates or components, will catch the large majority of regressions. When you update themes or plugins, add a quick accessibility check to your testing, since these updates are a frequent source of silent breakage. Folding this into your existing schedule keeps it manageable, and our website maintenance guide shows how it fits alongside everything else.

Prioritising fixes

When a review surfaces a list of issues, you will rarely be able to fix everything at once, so prioritise. Problems that completely block a task, such as a checkout form that cannot be completed with a keyboard, matter far more than minor inconveniences. Issues on high-traffic pages affect more people than those on rarely visited ones. Working from "blocks an essential task" down to "minor polish" lets you make meaningful progress with limited time. This same prioritisation mindset applies to the kind of compliance work covered in our website compliance basics article, which often overlaps with accessibility.

Working with the right people

For straightforward sites, an owner or small team can handle most accessibility maintenance with the checks described here. As sites grow more complex, especially with custom interactive features, it becomes worth involving someone with deeper expertise. The most valuable form of testing is feedback from people who actually use assistive technology, because they encounter barriers that no checklist anticipates. If you can build any relationship with such users, even informally, the insight is far richer than any automated report.

Whatever level of resource you have, the principle is the same: small, regular attention beats occasional heroic effort. A site that gets a light accessibility check every quarter and a careful one once a year will stay in far better shape than one that is audited intensively at launch and then ignored for three years. Accessibility, like the rest of your site, rewards consistency over intensity.

Bringing it together

Accessibility is not a certificate you earn and frame on the wall. It is a quality of your website that lives or dies by how you maintain it. Every new page, design tweak, and software update is a chance for it to slip, and the only reliable counterweight is routine attention. The good news is that the habits involved are modest. Add alt text as you publish, check contrast when you change colours, navigate by keyboard now and then, run an automated scan on a schedule, and fix the things that block people first.

Done consistently, this keeps your site open to the widest possible audience and avoids the far larger cost of a remediation scramble later. Accessibility maintenance is really just good website maintenance applied with a particular group of users in mind, and those users are far more numerous than most owners assume. Treat it as part of your ongoing care for the site, and it stops being a daunting project and becomes simply how you work.

Frequently asked questions

References

1. W3C Web Accessibility Initiative, "Introduction to Web Accessibility" w3.org/WAI
2. web.dev, accessibility learning resources, web.dev

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