Why Accessibility Should Be at the Heart of Every Website Design
Published by Lintel Digital | Web Development & Website Design Agency
When most businesses think about their website, they think about aesthetics, load speed, and lead generation. Accessibility rarely makes the shortlist. Yet for the estimated 1 in 5 people in the UK living with a disability, an inaccessible website is not an inconvenience. It is a closed door.
For specialist trades and service businesses, whether you're running a structural engineering consultancy, a plumbing and heating company, or a professional services firm, your website is often the first impression a potential client gets of your business. If that experience is broken for a significant portion of your audience, you are not just losing customers. You are also falling behind your competitors and, in some cases, risking legal exposure under the Equality Act 2010.
At Lintel Digital, we build websites and web applications with accessibility baked in from the ground up, not bolted on as an afterthought. Here's why it matters, what best practice looks like, and how we make it happen.
What Is Web Accessibility?
Web accessibility, often referred to as A11y (a numeronym: "A" + 11 letters + "y"), is the practice of designing and developing websites so that people with disabilities can use them effectively. This encompasses a broad range of conditions, including:
- Visual impairments: users relying on screen readers or high-contrast modes
- Motor impairments: users who navigate via keyboard or switch devices rather than a mouse
- Cognitive and learning disabilities: users who benefit from clear language, consistent layouts, and minimal distractions
- Hearing impairments: users who need captions and transcripts for audio and video content
The global standard for web accessibility is the Web Content Accessibility Guidelines (WCAG), published by the W3C. The current benchmark is WCAG 2.2, which organises requirements into three levels of conformance: A, AA, and AAA. For most commercial websites, achieving Level AA is the accepted standard and the baseline Lintel Digital targets on every project.
Why It Matters for Your Business
Accessibility is not a niche concern. Around 16 million people in the UK are living with a disability, and the collective spending power of disabled people and their households (sometimes called the "Purple Pound") is estimated at over £274 billion per year.
For businesses in specialist sectors, the case is even more compelling. Consider a consultancy that provides industrial safety training, or a home services company offering adaptations for elderly or disabled homeowners. Their very audience is likely to include people who depend on accessible web experiences daily. Poor website design in these sectors does not just reflect poorly on the brand; it actively undercuts trust and credibility.
Beyond the moral and commercial arguments, there are practical SEO benefits too. Many of the principles that make a website more accessible also make it more discoverable. Descriptive alt text helps screen reader users understand images, and it also helps search engines index that content. Clear heading hierarchies assist users navigating with assistive technology, and they give search engines a better understanding of page structure. Accessibility and good SEO are, more often than not, two sides of the same coin.
Accessibility Best Practices in Web Development
Here is a breakdown of the core accessibility practices that should be standard on any professional web development project.
1. Semantic HTML
The foundation of accessible web development is writing meaningful, well-structured HTML. Using the correct elements for the right purpose (headings for structure, buttons for actions, links for navigation) gives assistive technologies the information they need to interpret and present a page correctly. A <div> styled to look like a button might fool a sighted user, but it tells a screen reader nothing useful.
2. Keyboard Navigation
Every interactive element on a page, including menus, forms, modal dialogs, and carousels, must be fully operable via keyboard alone. This means logical tab order, visible focus indicators, and no "keyboard traps" where a user can navigate into a component but cannot navigate out. For engineering firms or trade businesses with complex quote request forms, getting this right is essential.
3. Colour Contrast
Text must meet minimum contrast ratios against its background: at least 4.5:1 for normal text and 3:1 for large text under WCAG 2.2 AA. Low contrast text is a common failure point, particularly in designs that favour muted palettes or place text over images. During website design, every colour combination is tested against these thresholds.
4. Alternative Text for Images
All meaningful images must have descriptive alt text. Decorative images should be given an empty alt attribute so screen readers skip them. For a home services or construction business that relies on project photography to build credibility, well-written alt text is also a direct SEO opportunity.
5. Form Accessibility
Forms are among the most common accessibility failure points on the web. Every input field needs a programmatically associated label, not just a visible placeholder. Error messages must be clear and specific, and form validation must be communicated in a way that does not rely on colour alone. For professional services websites where enquiry forms are the primary conversion mechanism, this is critical.
6. Accessible Multimedia
Video content should include captions. Audio content should be accompanied by transcripts. For consultancies or training providers who host webinars, explainer videos, or case study content, this is both an accessibility requirement and a content quality standard.
7. Responsive and Zoom-Friendly Design
Content must remain usable when a browser is zoomed to 200% or more. Mobile-first, responsive website design naturally supports this, but it requires deliberate testing. Reflow, the ability for content to adapt to a single column at high zoom without horizontal scrolling, is a key WCAG criterion.
8. ARIA Landmarks and Labels
Where semantic HTML alone is not sufficient, such as in complex single-page applications or interactive dashboards, ARIA (Accessible Rich Internet Applications) attributes fill the gaps. Landmark roles like main, nav, and aside help screen reader users understand page structure and jump between sections efficiently. Used correctly, ARIA dramatically improves the experience of complex web applications for users of assistive technology.
How We Test for Accessibility
Good intentions are not enough. Accessibility has to be verified. At Lintel Digital, we use a layered testing approach throughout the web development process.
Axe
Axe is an industry-leading accessibility testing engine developed by Deque Systems. We integrate the Axe browser extension and, where appropriate, the axe-core library directly into our development and QA workflows. Axe scans rendered pages and reports on violations against WCAG criteria, categorising issues by severity and providing clear guidance on how to resolve them. It's fast, reliable, and surfaces a wide range of issues that would otherwise require extensive manual checking.
Importantly, Axe is designed to have zero false positives. Every issue it flags is a genuine problem, which makes it a trustworthy tool at every stage of a project.
Lighthouse
Google Lighthouse is built into Chrome DevTools and provides automated audits across performance, SEO, and accessibility. The accessibility score is driven by the axe-core engine, so there is overlap between the two tools, but Lighthouse provides additional context, particularly around performance factors that affect accessibility, such as page load time and cumulative layout shift.
We run Lighthouse audits as part of every pre-launch checklist. Scores are reviewed alongside our clients, and we aim for a minimum Lighthouse accessibility score of 90 on all projects, with most reaching 95 to 100.
Manual and Keyboard Testing
Automated tools, as powerful as they are, cannot catch everything. Issues like logical reading order, meaningful focus management, and the quality of alt text require human judgement. Our team conducts manual keyboard walkthroughs of every page template, verifies that screen readers (including NVDA and VoiceOver) interpret content correctly, and reviews all user-facing copy for plain language and clarity.
Continuous Monitoring
For ongoing web development retainers and hosted projects, accessibility monitoring does not stop at launch. Tools like Axe's CI integration allow accessibility checks to run automatically when new code is deployed, catching regressions before they reach users.
Accessibility in the Industries We Serve
Different sectors bring different accessibility considerations. At Lintel Digital, we work across a range of specialist industries, and accessibility requirements vary depending on the audience and the nature of the content.
Engineering and Technical Consultancies often present complex information: datasheets, technical drawings, compliance documentation. Ensuring these are accessible, including tagged PDFs, accessible data tables, and clearly labelled downloads, is a real challenge that demands both technical skill and careful content design.
Home Services Businesses serve a broad demographic that skews older, where visual impairments, motor difficulties, and cognitive changes are more prevalent. A website that is difficult to use with a keyboard, or that presents important information in small, low-contrast text, is failing a substantial portion of its target audience.
Professional Services and Consultancies often rely on forms, portals, and document-heavy interfaces. Accessible form design and clearly structured content are not optional extras in these contexts; they are fundamental to delivering a professional client experience.
Accessibility Is Good Web Development
There is sometimes a perception that accessibility is an extra cost, something layered on to a project at additional expense. In reality, when accessibility is treated as a design and development principle from day one rather than a compliance checkbox, the cost is minimal and the benefits are substantial.
Better semantic structure, cleaner code, improved SEO performance, a wider potential audience, reduced legal risk, and a demonstrably more professional product. These are the outcomes of building accessibly. They are also exactly what every business should want from their investment in web development.
Building for everyone is not a constraint on great website design. It is the standard it should be held to. Every project Lintel Digital delivers is built with that standard in mind, from the first line of code to post-launch monitoring. If your current website falls short, or you are planning a new build and want to get it right from the outset, get in touch.
Lintel Digital is a web development and website design agency specialising in high-performance websites and web applications for specialist trades, services, and professional consultancies. Get in touch to discuss your next project.