Global
Congratulations on taking the first step toward a website that actually works for your business. Most sites lose visitors to the same avoidable mistakes: slow pages, confusing navigation, weak calls to action and cluttered layouts. This guide walks through the 11 most common web design mistakes, why they happen and how to fix them, then turns every fix into a tick-as-you-go checklist you can run against any site. Backed by real design and optimisation work across 300+ projects.
Explore high-impact fixes pulled directly from the Website Health Check 2026. These practical moves help you fix what slows your site down, make every page easy to navigate and act on, and remove the friction that quietly drives visitors away before they convert.
Fix the Foundation Before Anything Else
Most sites lose visitors before the content even loads. This section covers the technical foundation that decides whether people stay: page speed, mobile responsiveness and a structure search engines can actually read. Compress and lazy-load media, design mobile-first, and build SEO into the design rather than bolting it on later.
Make Every Page Easy to Use and Act On
A site can be fast and findable yet still fail to convert. This part of the checklist shows you how to simplify navigation, sharpen your calls to action and bring consistency to your design. Use clear menus, one benefit-driven CTA per page, generous white space and a unified design system that builds trust.
Respect Your Visitor's Time and Attention
The fixes that quietly win or lose users. This section covers accessibility done right, media that doesn't hijack the experience, and pop-ups that help instead of interrupt. Build to WCAG 2.1 AA, switch off autoplay, and time pop-ups to user intent so they convert without driving people away.
Most sites lose visitors before the content even loads. This section covers the technical foundation that decides whether people stay: page speed, mobile responsiveness and a structure search engines can actually read. Compress and lazy-load media, design mobile-first, and build SEO into the design rather than bolting it on later.
A site can be fast and findable yet still fail to convert. This part of the checklist shows you how to simplify navigation, sharpen your calls to action and bring consistency to your design. Use clear menus, one benefit-driven CTA per page, generous white space and a unified design system that builds trust.
The fixes that quietly win or lose users. This section covers accessibility done right, media that doesn't hijack the experience, and pop-ups that help instead of interrupt. Build to WCAG 2.1 AA, switch off autoplay, and time pop-ups to user intent so they convert without driving people away.
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