Precise Leak & Route Detection
Drain Tracing & Tracer Dye Testing London
When a drain is blocked or leaking but the source is hidden, you need fast, precise detection. Our emergency drain tracing service in London dispatches engineers 24/7 to quickly locate the exact problem using advanced tracer dye testing and CCTV surveys.

From Victorian terraces in Islington with complex brickwork to modern flats in Canary Wharf with shared drainage runs, hidden faults can cause escalating damage. Immediate action is crucial: if you notice unexplained damp, slow drainage, or foul odours without a visible source, call us straight away. We will guide you over the phone and dispatch a team.
Our focus is rapid, transparent emergency response. We get to you fast, diagnose the issue on-site with clear evidence, and explain your options and our transparent day, evening, and night pricing bands before any work begins.
Our emergency drain tracing is priced using a transparent time-of-day band structure covering standard day, evening, and night/weekend call-outs. The diagnostic fee is confirmed before work begins.
What you get
- 24/7 Emergency Dispatch: We are on call round-the-clock, with rapid deployment across London to contain drainage issues fast.
- Tracer Dye Precision: We use non-toxic, fluorescent dyes introduced into the system to visually trace flow paths and pinpoint leak locations exactly.
- CCTV Survey Integration: Our cameras provide real-time video evidence of blockages, cracks, and misalignments within your pipes.
- Immediate On-Site Diagnosis: Our engineers provide clear findings and visual proof at the scene, so you understand the problem immediately.
- Expertise in All Property Types: We diagnose complex drainage in period homes, basement conversions, and commercial properties across London boroughs.
- Transparent Process & Pricing: We explain every step and our time-of-day pricing structure (day, evening, night bands) upfront, with no hidden costs.
How it works
A method, not a guess
01
Your Emergency Call
Call us immediately upon noticing signs like unexplained damp or persistent blockages. We dispatch an engineer fast and advise on any immediate steps to prevent further damage.
02
Rapid On-Site Assessment
Our engineer arrives and conducts a swift initial inspection to determine the most effective tracing method, explaining the approach and transparent pricing band for the time of your call.
03
Precise Tracing Execution
We deploy tracer dye and/or CCTV equipment to follow the drainage route, visually identifying the exact point of failure, leak, or blockage.
04
Clear Findings & Next Steps
You receive immediate, visual evidence of the problem. We then present your clear repair options, prioritising urgent fixes to restore flow and prevent damage.
Questions
Drain Tracing FAQs for London homeowners
What are the signs I need drain tracing?
Key signs include unexplained damp patches on walls or floors, persistently slow drains with no clear blockage, foul odours from outside drains or underfloor areas, and soggy ground in your garden near drainage runs. If the source isn't visible, tracing is the next step.
How quickly can you get to me in London?
We operate a rapid dispatch system 24/7. Once you call, we assign the nearest available engineer and provide an estimated arrival time, prioritising emergency calls to minimise property damage.
Is tracer dye testing safe?
Yes. We use environmentally safe, non-toxic, and non-staining fluorescent dyes approved for drainage systems. They are introduced in small quantities to vividly trace water flow without harming your pipes or the environment.
What happens after you locate the problem?
We provide you with a clear diagnosis and visual evidence (like CCTV footage). We then discuss all repair options, from a simple clearance to a more complex liner repair or excavation, so you can make an informed decision on the spot.
How does your time-of-day pricing work?
We have transparent pricing bands for standard weekday hours, evening calls, and night/weekend emergency call-outs. The applicable band is always confirmed before we begin the diagnostic tracing work, so there are no surprises.
Explore the cluster
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Underground leaks
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Trace & access
Insurer-ready reports
Pricing
Fixed fees and no find no fee
Areas we cover
All 33 London boroughs
Leak detection guide
How methods compare
Insurance claims
Escape of water explained
London-wide
Drain Tracing across all 33 boroughs
Same multi-method kit and fixed-fee approach from Barking to Richmond. Pick your borough for local housing detail.
Water going somewhere it shouldn't?
Tell us the symptoms and your postcode. We'll confirm the visit, the fixed detection fee and the arrival window before you commit to anything.
Book a detection visit