Common Web Design Mistakes and How to Fix Them

The most common web design mistakes are a slow site, a layout that breaks on a phone, text people struggle to read, navigation that hides what you sell and no clear next step for the visitor. Each one costs you enquiries, and each one is fixable without starting from scratch. Below is how to spot them on your own site and what to do about them.

Why do small design mistakes cost you customers?

Your website does one job: it turns a stranger into an enquiry. A visitor arriving from Google or a recommendation gives you a few seconds to show them they are in the right place, that you do what they need and that getting in touch is easy. Any friction in those seconds sends them back to the search results, where your competitors are one tap away.

The mistakes in this article are not about taste. They are about whether a visitor can load the page, read it, find what they came for and act on it. Fonts, colours and white space matter, but they matter because they serve those four things, not because they make the site look fashionable.

Is a slow website really a design problem?

Yes. Speed is decided by design choices: oversized hero images, auto-playing video, heavy sliders and a stack of plugins all add weight before your visitor sees a single word.

Google measures this through Core Web Vitals. According to web.dev's guidance on Core Web Vitals (2026), a good experience means the main content loads within 2.5 seconds, the page responds to a tap or click within 200 milliseconds and the layout shift score stays at 0.1 or less, measured at the 75th percentile of page loads. If your pages jump around as images load, or your main heading takes several seconds to appear, you are failing those checks.

The fix is to compress and correctly size every image, remove sliders and plugins you do not need, and keep the top of each page simple so the important content appears first.

Does my website need to work perfectly on a phone?

Yes. Your phone layout is not a smaller version of your site; for Google it is your site. Google Search Central (2026) states plainly that it uses the mobile version of a site's content, crawled with the smartphone agent, for indexing and ranking. If content is missing, cramped or broken on mobile, that is the version Google judges you on.

The common faults are easy to find. Open your site on your own phone and check whether you can read the text without zooming, tap buttons without hitting the wrong one, see your phone number without scrolling through three screens and fill in your contact form without fighting the keyboard. Anything that annoys you will annoy your customers too.

Can people actually read your text?

Readability is where fonts, colour and spacing come together, and it is where sites built purely to look stylish fall down. Pale grey text on a white background, light text over a busy photo and tiny body copy all look elegant in a design mock-up and fail in daylight on a phone screen.

There is a clear standard for this. The W3C's WCAG 2.2 contrast guidance (2026) sets a minimum contrast ratio of 4.5:1 for normal text and 3:1 for large text at level AA. Free contrast checkers will tell you in seconds whether your colours pass.

A few simple rules keep text readable:

• Use two fonts at most, one for headings and one for body text.
• Keep body text large enough to read on a phone without zooming.
• Give paragraphs and sections room to breathe with generous white space.
• Pick one accent colour for buttons and links so they stand out from everything else.

Those rules do more for your brand than any amount of decoration, because a visitor who can read your page is a visitor who can be persuaded by it.

Can visitors find what you do in seconds?

Navigation fails when a site is organised the way the business thinks rather than the way customers search. A menu item called "Solutions" or "What We Offer" tells a visitor nothing. "Kitchen fitting", "Bathroom renovations" and "Get a quote" tell them exactly where to go.

Keep your main menu short, name pages after the services people search for and make sure your homepage states what you do and where you work in the first line a visitor reads. Every service you want to be found for deserves its own page with its own heading, rather than a single long list that neither visitors nor search engines can make sense of.

What should happen when someone is ready to get in touch?

This is the mistake that costs the most, because it loses people who have already decided they like you. A contact page with no phone number, a form asking for ten fields, or a call to action buried at the foot of a long page all leak enquiries at the final step.

Put one clear action on every page, whether that is a call, a quote request or a booking. Show your phone number in the header on mobile so it can be tapped. Keep forms to the details you need to reply: name, contact details and a short message. If you sell to tradespeople or local customers, our guide on what a tradesperson website should include covers the trust signals that help visitors take that step.

Is it better to fix your current site or start again?

The answer sits in what is underneath. If the site is built on a sound platform and the problems are images, copy and layout, targeted fixes will do the job. If it is slow at its core, hard to edit, broken on mobile and missing the structure search engines and AI assistants need to understand it, rebuilding is quicker and cheaper than patching.

Rebuilding does not mean an agency-sized bill. Traditional agencies charge £10,000 to £20,000 for a bespoke website. At DLR Media, our websites start from £1,500 + VAT for a one-page brochure site, or £149 a month + VAT, and a bespoke lead generation site of up to 20 pages is £4,500 + VAT or £499 a month + VAT. We write the copy, every site is SEO and GEO ready, and our sites go live in 5 days on average. For a full breakdown of what you get at each level, read our guide to small business website costs in the UK for 2026.

Frequently asked questions

How do I know if my website is too slow?

Run your homepage through Google's PageSpeed Insights, which reports your Core Web Vitals for mobile and desktop. If your main content takes longer than 2.5 seconds to appear, your site is too slow and images are the first place to look.

Do I need to redesign my whole website to fix these mistakes?

No. Speed, readability and calls to action can be fixed on an existing site if the platform underneath is sound. A full rebuild makes sense when the site is broken on mobile, hard to update and missing basic page structure.

How many fonts and colours should a website use?

Two fonts and a small palette with one accent colour. That keeps your pages consistent, makes buttons and links stand out and gives your brand a clear, recognisable look.

Does web design affect where I appear on Google?

Yes. Google indexes and ranks the mobile version of your site and measures page experience through Core Web Vitals, so a slow or broken mobile layout works against you in search as well as with visitors.

Get a website that avoids these mistakes from day one

If your site is making any of these mistakes, we can fix them or build you something better in days, not months. Request a website quote or call us on +44 1382 699595 to talk it through.