Website Accessibility: A Legal and Moral Obligation for UK Businesses

Website accessibility is not a niche concern for specialist organisations — it is a legal requirement and a business imperative that affects every UK company with an online presence. Approximately 16 million people in the United Kingdom live with a disability, representing roughly 24% of the population. When your website is not accessible, you are excluding nearly a quarter of potential customers, clients, and partners from engaging with your business online.

Beyond the moral argument, UK law is clear: the Equality Act 2010 requires businesses to make reasonable adjustments to ensure their services are accessible to disabled people, and this obligation explicitly extends to websites and digital services. The Public Sector Bodies (Websites and Mobile Applications) Accessibility Regulations 2018 impose additional, stricter requirements on public sector organisations, and the direction of travel in UK policy is towards greater digital accessibility obligations for all businesses.

This guide explains what website accessibility means in practice, why it matters for UK businesses, what the law requires, and how to make your website genuinely accessible to all users.

What Is Website Accessibility?

Website accessibility means designing and developing websites so that people with disabilities can perceive, understand, navigate, and interact with them effectively. Disabilities that affect web usage include visual impairments (blindness, low vision, colour blindness), hearing impairments (deafness, hard of hearing), motor impairments (limited fine motor control, inability to use a mouse), cognitive impairments (dyslexia, attention disorders, memory difficulties), and temporary or situational disabilities (a broken arm, bright sunlight on a screen, a noisy environment).

Accessibility is measured against the Web Content Accessibility Guidelines (WCAG), published by the World Wide Web Consortium (W3C). WCAG defines three levels of conformance: Level A (minimum), Level AA (the standard most organisations should meet), and Level AAA (the highest level). UK law does not specify a WCAG level explicitly, but Level AA conformance is widely accepted as the benchmark for meeting Equality Act obligations, and is the explicit requirement for public sector websites under the 2018 regulations.

The Legal Landscape in the UK

The Equality Act 2010

The Equality Act 2010 prohibits discrimination against disabled people in the provision of services. Since websites are a means of providing services, they fall within the Act's scope. Section 29 requires service providers to make reasonable adjustments where a disabled person would otherwise be placed at a substantial disadvantage. A website that cannot be used by people with visual impairments, for example, places those individuals at a substantial disadvantage compared to sighted users.

The Act does not prescribe specific technical standards, but the Equality and Human Rights Commission (EHRC) has indicated that WCAG 2.1 Level AA conformance is a reasonable benchmark for compliance. Legal actions under the Equality Act for inaccessible websites are increasing in the UK, following a trend already well-established in the United States and the European Union.

The Public Sector Bodies Accessibility Regulations 2018

Public sector organisations in the UK face more prescriptive requirements. The 2018 regulations mandate WCAG 2.1 Level AA conformance for all public sector websites and mobile applications, require organisations to publish an accessibility statement, and are monitored and enforced by the Central Digital and Data Office (CDDO). For UK businesses that supply services to the public sector, demonstrating website accessibility can be a competitive advantage in procurement processes.

The European Accessibility Act (EAA)

Although the UK is no longer in the EU, the European Accessibility Act, which came into force in June 2025, affects UK businesses that sell products or services into EU markets. The EAA requires digital services including websites and mobile apps to be accessible, with WCAG 2.1 Level AA as the baseline. UK businesses trading with EU customers must comply with these requirements for their EU-facing digital services.

The Business Case for Accessibility

Beyond legal compliance, website accessibility delivers tangible business benefits that UK SMEs should not overlook.

Market Reach and Revenue

The "Purple Pound" — the spending power of disabled consumers in the UK — is estimated at £274 billion per year. Research by the Click-Away Pound Survey found that 71% of disabled customers leave a website that they find difficult to use, and 86% of disabled users said they would spend more with businesses that have accessible websites. An inaccessible website is not just exclusionary — it is leaving significant revenue on the table.

SEO Benefits

Many accessibility best practices directly improve search engine optimisation. Descriptive alt text helps search engines understand image content. Proper heading structure helps search engines parse page hierarchy. Transcript and caption text provides additional indexable content. Clean, semantic HTML improves crawler efficiency. Businesses that invest in accessibility often see measurable improvements in their search rankings as a welcome side effect.

Improved User Experience for Everyone

Accessibility improvements benefit all users, not just those with disabilities. Clear navigation helps everyone find what they need. Readable fonts and good contrast reduce eye strain for all readers. Keyboard shortcuts speed up power users. Mobile-friendly design — which overlaps significantly with accessibility — serves the majority of UK web traffic that now comes from smartphones and tablets. Captions on videos are used by many people in open-plan offices or public spaces, not just hearing-impaired users.

Practical Accessibility Improvements

Making your website accessible does not require rebuilding it from scratch. Many of the most impactful improvements are straightforward to implement and can be addressed incrementally.

Images and Alternative Text

Every non-decorative image on your website should have an alt attribute that describes its content or purpose. For a product photo, the alt text should describe the product. For an infographic, it should summarise the key information. For purely decorative images, an empty alt attribute (alt="") tells screen readers to skip them. This single improvement addresses one of the most common accessibility failures and is straightforward to implement even on existing websites.

Keyboard Navigation

All interactive elements on your website — links, buttons, form fields, menus, and custom components — must be operable using a keyboard alone. Users who cannot use a mouse rely on the Tab key to move between elements and Enter or Space to activate them. Test your website by putting your mouse in a drawer and navigating with just the keyboard. If you cannot reach or activate any interactive element, keyboard users cannot either.

Colour and Contrast

WCAG 2.1 Level AA requires a minimum contrast ratio of 4.5:1 for normal text and 3:1 for large text (18pt or 14pt bold). Many UK business websites fail this requirement, particularly those using light grey text on white backgrounds or coloured text on coloured backgrounds. Free tools such as the WebAIM Contrast Checker allow you to verify contrast ratios and identify combinations that need adjustment.

Form Accessibility

Forms are critical conversion points on most business websites, and they are frequently inaccessible. Every form field must have a visible label that is programmatically associated with the field using the HTML <label> element. Error messages must be clear, specific, and announced to screen readers. Required fields must be identified in a way that does not rely solely on colour (for example, an asterisk with explanatory text rather than just a red border).

Video and Audio Content

Videos must have captions for hearing-impaired users, and audio content should have transcripts. For pre-recorded video, captions can be added after production. For live video, auto-generated captions (available in platforms like YouTube and Microsoft Teams) provide a starting point, though they should be reviewed and corrected for accuracy. Audio descriptions — narration describing important visual information — are required at Level AA for pre-recorded video content.

Accessibility Area	Quick Win	Impact Level	Effort Required
Images	Add alt text to all images	High	Low
Colour contrast	Check and fix contrast ratios	High	Low-Medium
Forms	Add labels to all form fields	High	Low
Headings	Use proper heading hierarchy	Medium	Low
Keyboard navigation	Test and fix focus order	High	Medium
Video captions	Add captions to all videos	High	Medium
Skip navigation	Add skip-to-content link	Medium	Low

Testing and Auditing Your Website

Accessibility testing should combine automated tools with manual testing and, ideally, user testing with disabled participants.

Automated testing tools such as WAVE, axe DevTools, and Lighthouse can identify many common accessibility issues quickly. However, automated tools typically catch only 30-40% of accessibility problems. They are excellent at finding missing alt text, contrast failures, and missing form labels, but cannot evaluate whether alt text is meaningful, whether keyboard navigation is logical, or whether content is genuinely understandable.

Manual testing is essential to catch the issues that automated tools miss. This includes testing keyboard navigation, checking that focus indicators are visible, verifying that screen readers announce content correctly, and evaluating the logical reading order of the page. The Government Digital Service (GDS) publishes detailed accessibility testing guides that provide a comprehensive manual testing methodology.

User testing with disabled participants provides the most valuable feedback. Nothing replaces observing real users with real assistive technologies interacting with your website. Organisations such as the Digital Accessibility Centre (DAC) in Swansea provide professional accessibility auditing services using teams of disabled testers.