0800 520 0043contact@cascadewaterservices.co.uk

Supply pipe repairs across London

A leak on a London supply pipe is rarely where the wet patch is. We locate it acoustically before any ground is opened — which matters more here than anywhere, because in London the ground you open is usually somebody’s permit, parking bay or period frontage.

Burst pipe or major leak in London?Call 0800 520 0043

The service

London makes exploratory digging expensive.

Everywhere, opening the ground to look for a leak is a poor way to find one. In London it is worse. Frontages are narrow and often original, driveways are block-paved or tiled, streets are permit-controlled, and a trench across a footway means traffic management and a highway authority to satisfy before anyone lifts a slab.

So the survey earns its place. We locate the defect acoustically — including with the non-invasive PipeMic system — trace the route and depth, and mark the position before excavating. The dig ends up a metre wide instead of a driveway wide, which in London is frequently the difference between a morning and a week.

The supply pipe runs from the point where it crosses the public–private boundary into the building. It is private pipework and the responsibility of the property it supplies, whichever company bills you. Establishing which side of the boundary the defect sits on is the first thing we settle, because it decides who pays.

What we do

Locate it, prove it, then open the ground once.

Three stages, and the London-specific part is how much the first one saves you.

Supply pipe connection at a property being checked during a Cascade Water Services leak investigation
Prove the loss first
01

Confirm the loss and whose it is

Everything off inside, watch the meter. A meter still turning means a genuine continuous loss. We then check pressure and flow at the boundary stop tap to establish whether the defect is on your private run or on the undertaker’s side — in London that may be Thames Water, Affinity Water or another company depending on where you are.

  • Meter test to confirm a continuous loss
  • Pressure and flow checked at the boundary
  • Responsibility established before any work is quoted
  • An honest answer when the cause is not a buried leak
Close-up of a pipe fitting and valve junction of the kind commonly found to be the source of a leak
PipeMic acoustic detection
02

Locate acoustically, allowing for London ground

Ground microphones and correlation find the escape from the surface. London complicates that: made ground in the inner boroughs is full of rubble and old foundations, clay damps the signal differently from gravel, and plastic pipe carries leak noise a much shorter distance than iron. It means more patience and closer sensor spacing rather than a different method.

  • Acoustic detection including the PipeMic system
  • Correlation across the run to pinpoint the position
  • Route, depth and material traced before excavating
  • Position marked on the ground and agreed with you
Cobbled London mews reinstated to match after a supply pipe repair
Reinstatement included
03

Repair and put the surface back

Where the run is otherwise sound we repair on location. Where the pipe is lead, undersized or failing repeatedly we will say a repair is a false economy rather than book the same visit again next winter. Reinstatement — block paving, tiled paths, tarmac, original stone — is part of the job, and where the works reach the footway we handle the highway side.

  • Targeted repair using compression or electrofusion fittings
  • Honest advice on repair versus full renewal
  • Block paving, paths and tarmac reinstated
  • Highway works and permits handled where the run crosses a footway

Why Cascade

Accredited, and the same team digs.

Plenty of firms will find a leak and leave you to arrange the rest. The value is one organisation locating it, repairing it and making good.

  1. 01

    Detection and repair under one roof

    No handover to a groundworker who was not there when the mark was made, and no second call-out charge to begin the actual work.

  2. 02

    Approved to work on drinking water

    WaterSafe approved contractor and WIAPS registered, so the repair is made to the standard the Water Supply (Water Fittings) Regulations require.

  3. 03

    Thirty years under London streets

    Three decades working in the capital and the surrounding counties — we know which areas throw up made ground, unrecorded services and shallow original pipework.

  4. 04

    24/7 for bursts

    Sudden loss of supply and major escaping water are answered on the freephone line at any hour, not queued to the next working day.

  5. 05

    We work in period property properly

    Tiled paths, stone thresholds and original frontages are common in London and are not reinstated with a shovel of tarmac.

Independently assessed

Full accreditation detail on the about page.

Technical detail

What governs the repair.

Ownership boundary
Public / private boundary
From the point where the pipe crosses onto private land, it is private pipework and the responsibility of the property it supplies. On the public side it belongs to the water undertaker — in London most commonly Thames Water, with Affinity Water and others serving parts of the capital.
Reference level of service
0.7 bar / 9 l/min
The minimum static pressure and flow an undertaker must deliver at the boundary stop tap. Good pressure at the boundary with poor pressure inside points at the private supply pipe.
Repair material
Blue MDPE
Renewed sections are installed in polyethylene to BS EN 12201. Repairs to sound runs use compression or electrofusion fittings appropriate to the existing material.
Depth of cover
750–1350mm
A supply pipe outside a building must sit no less than 750mm and no more than 1350mm below ground. Older London runs are frequently shallower, which is one reason a repair sometimes becomes a renewal.
Detection limit
Material dependent
Leak noise travels well along iron and copper and is damped quickly by plastic, so an MDPE run needs sensors closer together. It changes how long a survey takes, not whether it works.

  • Made ground is common in the inner boroughs

    Brick, concrete and demolition rubble in the fill scatter both acoustic signal and excavation plans, and they are the usual reason a trenchless method is ruled out on a London job.

  • London clay moves

    Shrink-swell in clay soils stresses buried pipework and old joints over time, which is part of why period properties see repeat failures on the same run rather than one isolated defect.

  • The footway is not yours

    Where the supply crosses a footway or carriageway, permits, traffic management and the highway authority’s reinstatement specification apply. We deal with that rather than leaving it with you.

Common questions

Before you enquire.

The questions we are asked most often about this service, answered without the sales gloss.

See all FAQs
Is a leak on my supply pipe my responsibility in London?

If it is on your side of the public–private boundary, yes — from the point where the pipe crosses onto your property to the building is private pipework, and it is the responsibility of the property it supplies, including the water lost. On the public side it belongs to the water undertaker serving your area, most commonly Thames Water in London but Affinity Water and others in parts of the capital. Establishing which side the defect sits on is the first thing we check.

Can you find the leak without digging up my front garden?

Locating it, yes — that is the point of acoustic detection. Ground microphones and correlation equipment find the escape from the surface, so the excavation goes where the defect actually is. Repairing it still means opening the ground, but at one marked point rather than along the whole run.

How quickly can you attend a burst in London?

We run a 24/7 response for bursts, major leakage and sudden loss of supply. Attendance depends on where you are and what is already running, so call the freephone line and we will tell you honestly when we can be with you rather than quoting a time that sounds good.

My property is period — will the path be put back properly?

Tiled paths, stone thresholds and original frontages are normal in London and are reinstated to match, not patched with tarmac. Reinstatement is part of the job and part of the price. Where the works reach the footway, the highway authority’s own specification applies and we handle that side.

Should the pipe be repaired or replaced?

If the run is otherwise sound and the defect is isolated, repair is faster, cheaper and less disruptive, and that is what we will recommend. Where the pipe is lead, undersized, or has already failed more than once — common in pre-1970 London stock — repair tends to move the failure along rather than end it. We will tell you which case you are in.

Do you cover my part of London?

London is a core operating area, alongside Hertfordshire, Bedfordshire, Essex, Cambridgeshire and Buckinghamshire. If you are unsure whether we reach your postcode, ask — we will tell you straight away rather than sending someone on a wasted visit.

London repair enquiry

Tell us the postcode and what the meter is doing.

Whether the meter turns with everything off, how the bill has moved, and where you have seen damp are usually enough for us to say what you are dealing with before anyone attends.

Or reach us directly

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Burst main or major leak? The freephone line is answered 24 hours a day.

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Where a London repair usually leads.