How to Find a Trusted London Plumber: 7 Red Flags to Avoid

When a pipe bursts or your heating gives up in the middle of winter, the last thing you need is a dodgy plumber turning a bad day into a worse one. And in a city like London, where everyone promises to be the “best in the business,” it’s surprisingly easy to get stung.

So how do you make sure the plumber you’re hiring knows what they’re doing — and won’t leave you chasing after unfinished work or hidden charges?

Based on years of hands-on experience helping Londoners with everything from emergency repairs to major installations, here are seven red flags that should make you think twice before letting someone through the front door.

Let’s start with the most important point: if they’re working on your boiler or any gas appliance, they must be Gas Safe registered. Not should be — must.

Ask to see their Gas Safe ID. A professional will have it on hand and won’t hesitate to show it. You can also double-check their credentials at gassaferegister.co.uk.

If they make excuses or change the subject, walk away.

You want a London plumber, not someone advertising across the UK from a call centre miles away. Look for companies with a registered address in the capital and a clear service area.

If their website just says “covering Greater London” without naming any specific boroughs, that’s a sign they may not be truly local — or they might not even turn up.

We all love a bargain — but when it comes to plumbing, you get what you pay for.

If the price seems suspiciously low, chances are they’re cutting corners, using poor-quality parts, or rushing through the job. Worse still, you may find they start the job cheap, then pile on the costs halfway through.

A good plumber will give you a clear quote, explain the pricing, and stick to it.

Before you call anyone, do a quick Google search. Look for verified reviews, not just a few lines of text on their website.

Be wary of companies with no online footprint or lots of complaints. Reviews that mention things like “never turned up,” “left a mess,” or “kept changing the price” should set alarm bells ringing.

Whether it’s fixing a tap or installing a full heating system, your plumber should provide:

• A written quote
• A proper invoice
• A guarantee on the work

If they won’t give you anything in writing, don’t give them the job.

There’s a difference between being well-rounded and claiming to do everything under the sun. If someone says they can handle gas, electrics, plumbing, tiling, plastering — all in one — ask how many of those they’re actually qualified for.

Stick with someone who specialises in plumbing and heating. It’s safer, and you’re more likely to get the job done right first time.

This one’s easy to overlook, but it matters. If they’re slow to respond to your calls, vague about timescales, or give you the runaround when you ask questions, imagine what happens when something goes wrong during the job.

Clear, prompt, respectful communication is a solid sign you’re dealing with a professional.

Here’s what to look for when you’re trying to make the right call:

• Gas Safe registration
• Upfront, transparent pricing
• Solid Google reviews (with real detail)
• Photos of past work
• A registered business address in London
• Paperwork: quote, invoice, and warranty

At Pleasant Plumbers, we’ve built our business on trust, not gimmicks. We don’t just show up and fix the problem — we explain it clearly, work cleanly, and stand by our work.

From emergency boiler repairs to full plumbing upgrades, we’re proud to be one of the most trusted plumbing firms in the capital. Call us any time — we’re here to help.

📲 Call or WhatsApp: 0800 046 1000
📧 Email: [email protected]
🌐 Visit: pleasantplumbers.com

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