Top 8 Leak Detection Companies in London for Emergency Repairs

When a leak starts, every minute counts. But finding someone reliable in London isn’t always straightforward. 

Some companies promise speed but lack specialist tools, while others excel at detection yet can’t handle emergency callouts. The difference matters when your property is on the line. 

We’ve rounded up the best leak detection companies in London, what each does best, and where they fall short.

Our Top 3 Picks

• Best for Non-Invasive Detection & Insurance Reports: London Leak Detection
• Best for Round-the-Clock Emergency Callouts: WeFix
• Best for Complex Drainage & Persistent Leak Issues: J Snow Drainage London

1. London Leak Detection

Best Overall Leak Detection Company in London

London Leak Detection has positioned itself as a go-to choice for homeowners and businesses that want speed, accuracy, and peace of mind. Unlike standard plumbers who may rely on trial and error, this team uses advanced acoustic, thermal, and moisture-mapping technology to pinpoint leaks without ripping up floors or walls. 

Their biggest selling points are fixed pricing, a “no find, no fee” policy, and strong support with insurance claims. 

Reviews are overwhelmingly positive, with customers calling it “the best decision” and praising both the service quality and cost savings.

Features

• No Find, No Fee guarantee for risk-free service
• Transparent fixed pricing (day rates, not hourly)
• Same-day emergency callouts, including weekends
• Specialist equipment: acoustic detection, thermal imaging, moisture meters
• Insurance claim support with full photo reports
• 12-month leak-free guarantee

Pros

• Fast and accurate leak detection (often within an hour)
• Detailed insurance reports that streamline claims
• Professional, polite, and punctual engineers
• Saves customers money by preventing unnecessary repairs
• Consistently praised for reasonable, transparent pricing

Cons

• Premium pricing compared to basic plumbers (though still considered fair)

Score: 4.8/5

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2. WeFix

Best for 24/7 Emergencies & Plumbing Support

WeFix isn’t a specialist leak detection firm alone – it’s a broader home services company covering plumbing, heating, electrics, and more. 

Where they shine is speed and reliability during emergencies. Customers consistently report engineers arriving within an hour, even in the middle of the night or over bank holidays, and leaving jobs tidy and well explained. 

Pricing can feel on the higher side, but the trade-off is immediate response, trusted engineers, and an 18-month guarantee on work.

Features

• 24/7 emergency response, often within 1 hour
• Wide service coverage: plumbing, heating, electrics, drains, air con, carpentry
• DBS-checked, uniformed engineers with ID and liveried vans
• Call centre provides engineer details (name, photo, reg plate) before arrival
• Transparent invoicing with time, labour, and materials breakdown
• 18-month guarantee on work

Pros

• Extremely fast response times, even nights and weekends
• Engineers praised for professionalism, friendliness, and clear communication
• Booking office provides proactive ETAs and updates
• Tidy, respectful work (protective overshoes, dust sheets, rubbish removal)
• Breadth of services means they can handle leaks plus related issues (boilers, electrics, etc.)

Cons

• Higher cost perception compared to smaller independents
• A few mentions of slower job pace relative to hourly charge

Score: 4.7/5

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3. City Plumbers London

Best for Transparent Pricing & Reliable All-Round Plumbing Service

Founded in 2018, City Plumbers has quickly built a reputation as one of London’s most dependable 24/7 plumbing and heating companies. What sets them apart is a straightforward, transparent pricing structure with no call-out, congestion, or ULEZ fees – a rarity in London. 

Customers praise their responsiveness during emergencies (even on holidays), the professionalism of engineers, and clear explanations of the work. 

With coverage spanning everything from leaks and boilers to drainage and gas, they’re a versatile option for both domestic and commercial needs.

Features

• 24/7 emergency call-outs, often within an hour
• Transparent pricing with no hidden fees (no call-out, ULEZ, or congestion charge)
• Wide service coverage: plumbing, heating, drainage, gas work, installations
• Fully qualified engineers with certifications and 100+ years combined experience
• Free advice for plumbing and heating queries
• All work guaranteed for 12 months

Pros

• Consistently fast response times, including weekends and holidays
• Engineers praised for professionalism, friendliness, and clear communication
• Fair, transparent pricing compared to competitors
• Wide service range, from simple leaks to full boiler installs
• Strong reputation as a trusted, go-to service for repeat customers

Cons

• One disputed negative review about cost and rudeness (business denies validity)
• Slight risk that speed may occasionally come at the expense of thoroughness

Score: 4.6/5

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4. Pleasant Plumbers London

Best for Ongoing Cover & “Customer-First” Emergency Support (with Leak Track & Trace)

Pleasant Plumbers blends emergency responsiveness with a membership-style model. They handle the full spread of plumbing, heating and gas work – including Leak Track & Trace – but what makes them stand out is the service ethos: real human help (even FaceTime troubleshooting), exact ETAs you can track, and community initiatives that aren’t just for show. 

If you want a team that’ll pick up the phone at odd hours and also keep you covered year-round with care plans, this is your lane.

They’re big on transparency and credentials (Gas Safe, CHAS, SafeContractor, Which? Trusted Trader), and reviews often mention named engineers going above and beyond. A few customers do flag pricing surprises or misdiagnosis on isolated jobs, so double-confirm scope and costs before work starts.

Features

• 24/7 emergency plumbing and heating with real-time arrival tracking and exact ETA
• Leak Track & Trace, burst pipes, mains water repairs, drainage, boilers, gas, electrics
• Engineers with 7+ years’ experience; vetted, certified, and regularly upskilled
• Remote help available (e.g., FaceTime guidance to avoid unnecessary visits)
• Tiered Monthly Protect Plans (£10.49–£20.49/mo) with priority service and add-ons
• Loyalty Earn programme (£100 referral reward), plus community/charity projects
• Full install/repair spectrum: boilers, cylinders, controls, powerflush, appliances

Pros

• Responsive, personable engineers; clear explanations and practical guidance
• Remote troubleshooting can save a call-out in simple cases
• Exact ETA tracking reduces “wait around” stress
• Membership plans and priority service suit landlords and busy households
• Strong accreditation stack and visible service standards

Cons

• Some reports of pricing disputes or higher-than-expected bills on certain jobs
• Occasional misdiagnosis/punctuality complaints among otherwise positive reviews
• Not a pure-play leak detection specialist; for complex non-invasive tracing with insurer-grade documentation, a dedicated specialist may have the edge

Score: 4.4/5

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5. London Emergency Plumbing

Best for Ultra-Fast Callouts Across London (with Leak Detection + Repairs)

If your priority is speed, London Emergency Plumbing is built for it. They run true 24/7 coverage across Greater London with quoted 30–60 minute arrivals and engineers who can handle leaks, drains, boilers, and electrics in one visit. 

Reviews regularly call out middle-of-the-night saves and calm, professional engineers. The trade-off to know about: pricing can escalate beyond the initial phone quote, and a minority of customers report bill shock or incomplete fixes when parts weren’t on hand.

Features

• 24/7 emergency response, advertised 30–60 min arrival
• Leak detection and repair, burst pipes, blocked drains/toilets, boiler faults
• Local, ID-checked engineers; insured and equipped vans
• Same-day service, weekends and holidays included
• “Transparent pricing” promise with cost breakdowns (ask for written estimate)

Pros

• Very fast attendance, including late nights and bank holidays
• Engineers frequently praised for professionalism and clear explanations
• Can tackle multi-trade problems in one go (plumbing, drainage, heating, electrics)
• Some customers note fair pricing for urgent callouts
• Simple booking flow; phone and online options

Cons

• Recurring complaints about pricing transparency and higher-than-expected totals
• A few reports of no fix but charged, or pressure to pay on the doorstep
• Occasional incomplete resolution due to missing parts and return-visit needs

Score: 4.3/5

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6. Westminster Heating & Plumbing LTD

Best for Long-Term Reliability & Family-Run Service

Westminster Heating & Plumbing has been operating since 2000 as a family-run business with deep roots in London. Many customers mention using them for over a decade, which says a lot about their consistency and trustworthiness. 

They’re Gas Safe registered, offer a 12-month guarantee on all work, and back Vaillant or Worcester boilers with extended manufacturer warranties. 

Reviews highlight professionalism, tidy workmanship, and a reputation built through word of mouth – but there are also occasional mentions of high hourly rates and jobs that needed reattendance.

Features

• Family-run business with 20+ years of experience
• Gas Safe registered (No. 126856)
• Full service range: boilers, heating, plumbing, bathrooms, landlord safety checks
• 12-month guarantee on all work
• Extended 5-year manufacturer warranties on select boiler installs
• Reputation built largely through referrals and repeat customers

Pros

• Loyal repeat clients over decades – strong signal of trust
• Quick response, sometimes within 15–30 minutes for emergencies
• Professional and friendly engineers who tidy up after jobs
• Known for honesty – waiving unnecessary fees or not charging for unneeded work
• Follow-up care to ensure everything runs smoothly

Cons

• A few complaints about being billed for travel or time not spent actively working
• Not all repairs are resolved first-time; some required follow-ups or third-party involvement

Score: 4.2/5

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7. J Snow Drainage London

Best for Specialist Drain & Leak Detection Solutions

While not a general plumber, J Snow Drainage has carved out a reputation as one of London’s most trusted drainage specialists. 

With a spotless 5.0 rating across 40+ reviews, they’re praised for doing what others can’t – fixing stubborn blockages, identifying hidden leaks through detailed CCTV surveys, and providing transparent, fair pricing. 

Customers repeatedly highlight their honesty (only charging for what’s needed), clear communication, and ability to resolve complex issues without upselling or cutting corners. For anyone facing recurring or serious drain-related leaks, they’re a go-to name.

Features

• 24/7 emergency drainage response across Greater London
• Blocked drain clearance, repairs, relining, CCTV surveys, mapping
• High-pressure water jetting and non-invasive diagnosis tools
• 10-year guarantee on repairs, with full £5m liability insurance
• Experienced, fully qualified engineers (Jamie and team praised often)
• Transparent pricing, discounts for seniors and vulnerable customers

Pros

• Consistent 5-star reviews highlighting reliability and trustworthiness
• Detailed CCTV reports and progress updates during jobs
• Fair, honest pricing with no hidden charges
• Quick response for emergencies, including same-day jobs for businesses
• Professional, polite, tidy team – customers often recommend by name
• Proven track record fixing problems other companies couldn’t solve

Cons

• Some complex jobs require extra time/cost, though handled well
• Not a generalist plumber; focus is on drainage, not all heating or boiler issues

Score: 4.1/5

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8. Phone A Plumber London

Best for Value-Focused Boiler & Plumbing Installs

Phone A Plumber is a smaller London outfit with 15+ years in the trade, known for competitive pricing and straightforward service. They’re Gas Safe registered, offer a 12-month warranty on repairs, and cover both domestic and commercial work. 

Reviews are largely positive, with customers describing engineers as professional, honest, and reliable. 

The main caveat is that many reviews are dated or incomplete, so while the track record is good, recent detail is thinner compared to bigger players.

Features

• Boiler installations, repairs, servicing, and central heating systems
• Gas Safe registered engineers and NICEIC-registered contractors
• 12-month warranty on all repair work
• Domestic and commercial plumbing callouts
• Emergency response available at short notice
• Competitive, transparent pricing (no hidden fees)

Pros

• Strong reputation for professionalism and honesty
• Competitive quotes and fair pricing, praised as “value for money”
• Responsive and reliable, often available quickly
• Engineers (Joseph, Bob) called out by name for thorough, high-quality work
• Trusted for both emergency fixes and more complex installations

Cons

• Average online score lower than some rivals (4.1/5)
• Limited recent detailed reviews; many are older or incomplete
• A few jobs noted as “more complicated than expected,” though resolved satisfactorily

Score: 3.9/5

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Comparison: Best Leak Detection Companies in London

How To Choose?

When water is pouring through your ceiling or creeping silently behind walls, the company you call makes the difference between a quick fix and a prolonged, expensive headache. 

Here’s what to look for – and how the top London firms stack up:

1. Company Experience & Track Record

Experienced teams diagnose faster, avoid unnecessary damage, and handle both homes and commercial properties confidently.

• Strong performers: Westminster Heating & Plumbing (20+ years, long-term repeat clients), J Snow Drainage (proven specialist that often succeeds where others fail), and London Leak Detection (10+ years, specialist focus).
• Less strong: Phone A Plumber has 15+ years, but with thinner, older reviews, making recent consistency harder to gauge.

2. Qualifications, Licensing & Insurance

Gas Safe registration, insurance, and DBS checks ensure compliance, safety, and peace of mind during stressful callouts.

• Strong performers: City Plumbers (Gas Safe, all engineers certified), Pleasant Plumbers (Gas Safe, DBS checks, real-time ETA tracking), Westminster Heating & Plumbing & London Leak Detection (Gas Safe, certified team).
• Less strong: WeFix highlight DBS checks but don’t advertise Gas Safe as clearly; Phone A Plumber is Gas Safe but has less emphasis on wider credentials.

3. Advanced Technology & Non-Invasive Methods

Tools like thermal imaging and acoustic detectors locate hidden leaks without ripping up floors, cutting both time and cost.

• Strong performers: London Leak Detection leads here with full specialist kit, “no find, no fee,” and insurer-grade reports. J Snow Drainage is also strong for CCTV surveys and advanced drain diagnostics.
• Less strong: WeFix, City Plumbers, and Pleasant Plumbers solve leaks but don’t emphasise specialist detection tech – they rely more on traditional plumbing expertise.

4. Emergency Response Speed

Minutes count in emergencies; fast arrivals prevent catastrophic damage.

• Strong performers: London Emergency Plumbing (30–60 min ETA advertised, true 24/7), WeFix (engineers often arrive within an hour, even at 3am), City Plumbers (same-day and weekend coverage).
• Less strong: Westminster Heating & Plumbing don’t advertise 24/7; Phone A Plumber respond quickly but aren’t marketed as round-the-clock emergency specialists.

5. Transparent Pricing & Guarantees

Clear, upfront costs and solid guarantees save customers from bill shock and ensure accountability.

• Strong performers: City Plumbers (no call-out, ULEZ, or congestion fees; 12-month guarantee), London Leak Detection (fixed 4-hour day rate; 12-month leak-free guarantee), J Snow Drainage (10-year repair guarantee).
• Less strong: London Emergency Plumbing gets repeated complaints about surprise add-ons; Pleasant Plumbers has occasional disputes about overcharging despite their transparency pledge.

6. Reputation & Customer Feedback

Reviews reveal the real story – professionalism, reliability, and whether companies deliver under pressure.

• Strong performers: J Snow Drainage (perfect 5.0 reputation, praised for integrity and results), London Leak Detection (consistently glowing feedback), Pleasant Plumbers (personable engineers, strong customer loyalty).
• Less strong: Phone A Plumber (solid but lower average score, with dated/incomplete reviews), London Emergency Plumbing (good service feedback but recurring pricing complaints).

Bottom Line: 

• For specialist leak detection, London Leak Detection and J Snow Drainage are standouts. 
• For rapid all-round emergency plumbing, WeFix and London Emergency Plumbing shine. 
• For trust and transparency, City Plumbers and Westminster Heating & Plumbing are strong bets. 
• Pleasant Plumbers and Phone A Plumber deliver solid service, but with occasional gaps in pricing clarity or recent review detail.

Frequently Asked Questions

Do leak detection companies also repair the leak once it’s found?

Some do, but not all. Specialists like London Leak Detection provide reports and can recommend trusted contractors, while companies such as WeFix or City Plumbers usually offer both detection and repair in one visit. Always confirm upfront.

How much does professional leak detection cost in London?

Pricing varies widely – from fixed day rates (£400–£500) with specialists to hourly charges (£120–£180+) with general plumbing firms. Costs can climb if repairs or parts are needed, so get a written estimate before work begins.

Is non-invasive leak detection really accurate?

Yes. With thermal imaging, acoustic detectors, and CCTV, leaks can often be pinpointed within centimetres. It avoids ripping up floors or walls unnecessarily, saving both time and money.

Can leak detection help with insurance claims?

Yes. Companies that provide detailed reports with photos (like London Leak Detection) make it easier to support a claim. Without proper documentation, insurers may delay or dispute reimbursement.

Conclusion 

Finding the right help in an emergency comes down to knowing which company is built for your situation. 

London Leak Detection stands out for specialist non-invasive technology and insurance-ready reports. WeFix is the call for 24/7 reliability when leaks strike at awkward hours. City Plumbers London wins on transparent pricing and fair guarantees, while Pleasant Plumbers add a personable, customer-first touch with membership plans. 

London Emergency Plumbing delivers speed with 30–60 minute arrivals, and Westminster Heating & Plumbing offers long-term trust as a family-run firm. For stubborn drainage issues, J Snow Drainage is the proven specialist, while Phone A Plumber brings competitive value for installs and repairs. 

These are the leak detection companies in London worth considering before the water spreads.