A website rarely fails loudly. It does not go down, it does not throw errors, and nobody complains. It just quietly converts fewer people than it should, and because there is no alarm for that, it can go on for years.
These are the signs worth checking, roughly in order of how much they cost.
It takes more than three seconds to load on mobile
Most people will not wait. They will not tell you they left, and they will not appear in your enquiries as a missing number.
Test it on a phone, on mobile data, not on the office wifi with the site already cached. The usual culprit is images uploaded straight from a camera at several megabytes each, which is fixable in an afternoon.
Getting in touch takes more than one step
If someone has decided to contact you, every extra action between that decision and doing it loses a percentage. A contact page they have to find, a form with nine fields, a phone number that is an image rather than a tappable link.
The fix is usually to put the way of contacting you at the end of every page, rather than in one place people have to go looking for.
It says what you do but not who it is for
“We provide bespoke solutions tailored to your needs” describes almost every business that has ever existed. A visitor cannot tell whether you work with someone like them, and the safest thing they can do is leave.
Naming the customer explicitly is uncomfortable, because it means turning some away. It also means the right ones recognise themselves immediately.
There is no evidence anyone has hired you
No named clients, no case studies, no photographs of finished work. A visitor deciding whether to trust you with money has nothing to go on but adjectives.
One real project written up honestly beats a page of testimonials with no surnames.
The content has visibly stopped
A news section whose most recent post is from three years ago, a copyright notice with an old year, a team page listing someone who left. Each one is small. Together they suggest nobody is minding the shop, and a visitor reasonably wonders whether that extends to the work.
If you are not going to keep a news section current, removing it is better than leaving it.
Nothing is measured
If you cannot answer how many people visited last month and what they did, every decision about the site is a guess, including whether any of the above is worth your attention.
This is the cheapest thing on the list to fix and the one that makes everything else knowable.
Where to start
Load your site on your phone, away from the office, and try to hire yourself. Where you hesitate is where your customers hesitate, and you already know the answers.
Most of these are hours of work rather than a rebuild. Describe what you find if you want a view on which ones actually matter for your business. When a rebuild genuinely is the answer, small business website design is set out separately.
Two causes worth ruling out specifically. Speed is the one most often blamed and most easily measured, and it is usually images rather than anything structural.
The other is quieter. A site that is hard to use for anyone with a disability loses those customers silently, and for many businesses that is now a legal question as well as a commercial one.
If people are arriving and not getting in touch and you cannot see why, describe what the site is meant to achieve. An outside read usually finds it quickly.
Each of these, in detail
This page is the sweep. Each of these takes one symptom and goes properly into it, starting with the question that decides where the money should go at all.
Common questions
How would I know if my site is losing customers?
You would not, which is the problem. Nobody reports giving up. Look instead at whether people arrive and leave quickly, whether every page has an obvious next step, and whether the site is genuinely usable on a phone.
Is a slow site really costing enquiries?
Going from eight seconds to three is transformative, because a large share of visitors leave before the page appears at all. Going from two seconds to one is a rounding error nobody feels.
What is the cheapest thing to fix first?
Send yourself a message through your own contact form and confirm it arrives. It takes two minutes and it is the single highest-value check on any small business website.