Common Website Design Mistakes That Reduce Conversions

Website design mistakes rarely look like mistakes when you're staring at the homepage on a laptop. They show up when a real customer tries to use the site on a phone with one hand, on a slow connection, in a hurry. I have audited enough small business sites now to say the same handful of problems keep showing up, and none of them are about colour choices or fonts.

Page weight nobody has checked

The single most common conversion killer is a homepage carrying five or six uncompressed hero images, an autoplay video, and a font loading from three different sources. None of that is visible as a mistake — it just quietly pushes load time past three seconds, and on a real mobile connection past three seconds is where visitors start leaving. Core Web Vitals scores exist precisely to catch this, and Google increasingly treats a slow page as a worse page regardless of how good the content is. Run your own site through PageSpeed Insights before assuming the problem is anything else.

Contact information that hides

I still see business sites where the phone number sits in 10px grey text in the footer, not tappable, and the WhatsApp option doesn't exist at all. A visitor who has decided to reach out should never have to scroll and search for how. Put the phone and WhatsApp link in the header, keep them in the same place on every page, and make sure they are actual tap-to-call and tap-to-WhatsApp links, not plain text a thumb can't act on.

• Uncompressed images and autoplay video bloating page weight
• Contact details buried in small footer text with no tap-to-call link
• Navigation menus with ten items when three would serve the visitor better
• Tiny buttons and links placed too close together for a thumb to hit accurately
• Forms asking for more fields than the business actually needs to follow up

Plugin bloat and mobile tap targets

On WordPress sites specifically, plugin bloat is a slow leak — each plugin added for a small feature adds scripts that stack up until the site that loaded fine at launch is sluggish a year later. Nobody notices because it happens gradually. Pair that with tap targets sized for a mouse pointer rather than a thumb, and you get a site where a visitor genuinely interested in your service gives up trying to submit the enquiry form on their phone, which is where most of your traffic almost certainly comes from.

A conversion problem is usually a friction problem, not a persuasion problem. Fix the friction before you rewrite the copy.

The caveat worth stating plainly: not every low-conversion site needs a redesign. Most need an audit — fix image sizes, fix tap targets, move the contact links, remove three unused plugins — and the same design can suddenly perform noticeably better. Redesigning before diagnosing is itself one of the common mistakes, because it burns budget on the wrong fix.

Send me your site link on WhatsApp and I will tell you honestly which of these mistakes is actually costing you enquiries, before we talk about redesigning anything.