Not one of the 43 UK plumber websites we tested showed all three of the things a homeowner checks before letting a stranger into their house.
The received wisdom is that trade websites are technically broken. Slow, unusable on a phone, no way to get in touch. We measured 43 of them properly to find out, and that turned out to be wrong. The technical layer is in good shape. What’s missing is everything that requires the business owner to make a decision.
On 2 August 2026 we collected 52 UK plumber websites from Google searches across nine cities: Croydon, Leeds, Manchester, Bristol, Birmingham, Glasgow, Edinburgh, Newcastle and Cardiff. Directories and national lead-generation sites were excluded, so every site belongs to an actual plumbing business.
Each homepage was loaded in headless Chrome at a 375×667 mobile viewport, the same shape as a phone. We then read the rendered page rather than the raw source. That distinction matters more than it sounds: a lot of these sites inject their phone number with JavaScript, so anyone parsing raw HTML would record it as missing. We know, because our first attempt did exactly that.
For page weight we added up every image, script and stylesheet the rendered page actually loads, capped at 40 assets per site.
Six sites returned a 403 to our crawler, which identified itself honestly rather than pretending to be a normal browser. One was serving a Cloudflare SSL error and is therefore broken for real visitors too. Two failed to render. That leaves 43.
Every single site we tested, 43 out of 43, had a mobile viewport tag. 95% offered one-tap contact through a phone link, WhatsApp or SMS. 86% had schema markup and 86% had a meta description. On the technical measures, this is a healthy set of websites.
That contradicts most of what gets written about trade websites, including a fair amount of agency marketing. The explanation is simple enough: templates and page builders solved the technical layer. You can’t buy a website in 2026 that isn’t mobile-responsive, because the theme handles it whether you understand it or not.
One number surprised us. 26% of the sites offered WhatsApp as a contact route, 11 out of 43. That’s faster adoption than we expected for a trade often described as slow to change, and only one site used WhatsApp without also having a phone link.
Below the technical measures, the numbers collapse. Reviews appear on 49% of homepages. Price or a call-out fee is mentioned on 30%. A Gas Safe registration number appears on 14%, six sites out of 43.
The top five ship with the template. The bottom three require a decision.
The Gas Safe gap is the one that stands out. 81% of the sites mention Gas Safe somewhere. Only 14% show the registration number. Four in five claim the credential, one in seven proves it, and the number is free to publish.
For what these signals do to your rankings rather than your conversion rate, see our local SEO for plumbers guide.
Adding up every image, script and stylesheet each page loads, the median came to 2.4MB. Two thirds of the sample, 28 of 43, were over 2MB. Four were over 5MB and the heaviest was 9MB. The lightest was 386KB, which proves the rest is a choice rather than a constraint.
Median 2.4MB. Two thirds are over 2MB, on a device that is usually running on mobile data.
Why does that matter for plumbing specifically? Because 53% of mobile visitors abandon a page that takes longer than three seconds to load, according to SiteBuilderReport’s 2026 Website Speed Statistics. And an emergency plumbing search rarely happens on wifi. It happens standing in a room with water in it, on whatever signal the house has.
Our figures are floors, not ceilings. 25 of the 43 sites hit the 40-asset cap, so their real page weight is higher than what we recorded. We cover what to do about this in our website design for plumbers guide.
A homeowner about to let a stranger into their house wants three things answered. Are you qualified. Do other people rate you. What is this going to cost. We checked how many sites answered all three, using the Gas Safe number, reviews on the page, and any mention of price.
UK plumber homepages showed a Gas Safe number, reviews and pricing together. Fifteen of the 43, just over a third, showed none of the three.
That is the finding. Not that these websites are badly built, because they aren’t, but that every one of them stops short of answering the questions the visitor actually arrived with.
| The three trust signals | Sites | Share |
|---|---|---|
| Reviews visible on the homepage | 21 | 49% |
| Price or call-out fee mentioned | 13 | 30% |
| Gas Safe registration number shown | 6 | 14% |
| All three together | 0 | 0% |
| None of the three | 15 | 35% |
Reviews are the most costly of the three to fix, because you have to go and earn them. The other two are typing. For why the review count matters to Google as well as to the customer, our SEO for plumbers guide covers the ranking side.
Three fixes, in order of how little effort they take. On this sample, doing all three would put you in a category of one.
Six digits, in the footer and near the top. It takes a minute and puts you in the 14% who prove the credential rather than the 81% who mention it.
Embed them live so they stay current. Half the sites we tested show nothing at all, so this alone moves you into the better half.
Not a full price list. The call-out fee and how you charge after it. 70% of the sites we tested say nothing about money anywhere, which leaves the visitor to guess or to ring someone else.
Want a Plumbing Website That Does All Three?
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See Our Plumber Website Design →How heavy should a plumber’s website be?
Under 1MB is achievable and three of the 43 sites we tested managed it, the lightest at 386KB. The median was 2.4MB and two thirds were over 2MB. Anything above 2MB is worth compressing, starting with uncompressed hero images.
Do UK plumbers have to show their Gas Safe number on their website?
There’s no legal requirement to display it on a website. But in our August 2026 audit only 14% of UK plumber homepages showed the number, against 81% that mentioned Gas Safe without one, so publishing it is an easy way to stand apart.
Should a plumber’s website show prices?
30% of the sites we tested mention a price or call-out fee. The argument against is that every job differs. The argument for is that saying nothing pushes the visitor to ring a competitor who did answer. A call-out fee and your hourly rate is usually enough.
How was this study carried out?
On 2 August 2026 we collected 52 UK plumber websites from Google searches across nine cities, excluding directories. Each homepage was rendered in headless Chrome at a 375x667 mobile viewport and the rendered DOM measured. Six sites blocked our crawler, one returned a server error and two failed to render, leaving 43.
The technical layer is solved. UK plumber websites load on phones, carry schema, and let you contact the business in one tap. Anyone still selling on the premise that trade websites are broken is describing 2018.
The commercial layer is wide open. Six digits, a review widget and one sentence about money would put a plumbing business ahead of all 43 sites we tested. None of it needs a developer.
If you want the detail behind each of those, our website design for plumbers guide covers the site itself, and our local SEO for plumbers service covers getting it found.
Sources and method
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