HERTFORDSHIRE, BEDFORDSHIRE & CAMBRIDGESHIRE
Leak Detection in Barnet
Hidden leaks in Barnet found with thermal imaging, acoustic and tracer gas equipment rather than by digging, with full written reports for insurance claims.
Leak detection in Barnet, where the hardest leaks to find are on the longest pipes: the supply run under a Totteridge drive, the primary circuit across an Arkley plant room, the heating loop in a Colindale screed. Thermal imaging, acoustic listening, tracer gas and moisture mapping, applied in sequence, so the leak is located before anything is opened. Ring 01462 506 374.
Signs that it is a leak
A meter that turns with the taps off. A boiler that needs topping up every few days. Warmth in a floor that should be cold. A stain that dries and comes back. A water bill out of proportion to the household. Running water audible at night. One sign is often innocent. Two together is water going where it should not, and every week it runs is more damage to the building around it.
Get a fixed price before we start
Call and talk to an engineer, or send us the details and we will come back to you with a price.
Four tools, one sequence
The thermal camera goes first because it is quick and non-invasive: a leaking hot pipe paints a plume across the screen, a cold one shows as a chill where the water is evaporating. Pressurised pipe gets the ground microphone, and we follow the sound along the run to where it peaks, which is the leak to within a tile. Underfloor heating and anything the first two cannot settle gets tracer gas: the circuit is drained, filled with a safe hydrogen and nitrogen mix, and the detector is walked over the floor until it finds the escape. The moisture meter runs alongside all of it, telling us whether we are chasing a pipe or a shower seal, a roof, or the ground.
Where Barnet’s leaks are
The long private supply pipe. This is the Barnet speciality. A Totteridge Lane, Arkley or Hadley house may have tens of metres of supply pipe between the boundary and the kitchen, laid when the house was and never looked at since, on London Clay, under mature trees. London Clay is highly susceptible to volume change: tree roots dry it in summer and it shrinks, the rain returns and it swells, and the geologists list fractured service pipes among the results. The leak shows as a wet patch on a lawn in August or a meter that never stops. Acoustic work along the run with a tracer gas confirmation finds it without digging the length of the drive, and the repair or the new run in plastic is priced separately.
Whose pipe, whose company. Affinity Water covers High Barnet, Totteridge, Whetstone, Finchley and Mill Hill; Thames Water covers Hendon, Golders Green and Hadley Wood. Whichever it is, the company owns the pipe to your boundary and you own it from there. For a leak in the road, ring the company on your bill. For a leak on your side, ring us.
Victorian and Edwardian houses. Wood Street, the streets around the 1872 stations at High Barnet and New Barnet, East Finchley, Cricklewood. Pipework through solid floors, joints that have corroded for a century, and the occasional pipe buried in a screed by a previous owner. The microphone does most of it, the camera confirms.
The 1930s semi’s loft tank. Whetstone, East Barnet, Friern Barnet, Mill Hill, Hendon. A float valve from decades ago and an overflow that goes nowhere useful produce a wet ceiling that is not a burst at all. The loft is checked before any floor is lifted.
Underfloor heating in screed. Colindale, Grahame Park, the developments around Brent Cross, the infill houses across the borough. Common in anything built this century, and a loop nicked at the build stage can take years to declare itself as a boiler that will not hold pressure. Tracer gas locates it and the smallest possible patch of floor comes up.
Showers. Beneath a bathroom, many so-called leaks are a tray seal that has failed, grout that has cracked, or a screen channel pulling away from the tiles, and water arrives only while the shower is running. The shower is tested separately from the pipework.
The plant room and the primary circuit
A different Barnet leak lives in the bigger houses on the ridge, and it is on the heating side rather than the supply. A plant room in the garage or an outbuilding, a system boiler and a cylinder, and long primary pipes running under floors and through voids to radiators and en suites a long way away. When one of those primaries weeps, the boiler loses pressure, the automatic filler tops it up if there is one, and the leak can run for a winter unnoticed while the oxygen in every top up quietly rusts the radiators from the inside. Finding it is a thermal camera job first, because the primary is hot and paints clearly through a floor, and a tracer gas job second where the run passes under a solid floor. What we always do afterwards is check the system for sludge, because a circuit that has been topped up for a season is never clean.
Hampstead Garden Suburb and the listed house
In the Suburb, and in the listed houses at Monken Hadley, Totteridge and Finchley Church End, non-invasive detection is not a preference but a necessity, because the floors, panelling and plaster that would otherwise be opened are protected. The order of work does not change. What changes is that we take the location to within a tile before a single board is disturbed, we photograph everything before and after, and where a floor has to come up we lift the minimum and put it back as it was. Owners of these houses have usually had a bad experience with somebody who started with a crowbar. We start with a camera.
Telling a supply leak from a heating leak
Barnet houses give us both, and the difference decides the tools and the company involved. A supply leak is on the cold main between the boundary and the taps: the water meter turns with everything shut, the bill rises, and the wet patch is in the garden, the drive or under the ground floor. A heating leak is on the sealed circuit between the boiler and the radiators: the meter does not move, the boiler’s pressure gauge falls, the filling loop is used more and more, and the damage is under a floor somewhere between the plant room and the furthest radiator. Two minutes on the phone establishes which you have, because the questions are simple: does the meter move with the taps off, and does the boiler lose pressure. From that we know whether to bring the microphone or the camera first, whether the water company has any part in it, and roughly how long the survey will take. It is worth knowing before you ring.
What to do before we arrive
If water is escaping now, stopcock off, cold tap open, pipes drained. If it is slow and invisible, leave the evidence alone: no dehumidifier, no heater, no lifted boards. A dried leak has to be found from scratch. Read the meter with every tap shut, read it again an hour on, and have both numbers ready when you ring.
Found without the digging
Non-invasive first, every time. We locate the leak, show you the evidence and fix it properly.
The survey fee
Fixed, and agreed before we attend. For that you get the leak pinpointed and marked on site, a report in writing with the camera images and meter readings, and, should you want us to repair it, a second fixed price for the repair. Almost everyone takes that option, because the engineer who found it already knows what is beneath the floor.
Insurance, and why early matters on clay
Trace and access cover, in most household policies, pays for finding the leak and making good afterwards even when the pipe repair itself is not covered. On London Clay there is a second reason to find leaks early: a leaking drain or supply pipe softening the ground under a footing is one of the classic causes of subsidence, and insurers in Barnet take a close interest in it. A report that finds and dates the leak is worth having for that alone. Check your policy wording, and ask us if it is unclear.
Water leak detection in Barnet
Water leak detection in Barnet most often means the long supply pipe under a drive in Totteridge, Arkley or Hadley Wood, on London Clay, under trees. Acoustic listening along the run, confirmed with tracer gas, finds the point without digging the length of it. Whether the supply is Affinity Water in the north of the borough or Thames Water in the south, the pipe from the boundary to the house is the owner’s, and we find and repair it on a fixed survey fee and a separate fixed repair price.
Related work in Barnet
The repair, once found, is usually a job for plumbers in Barnet. A heating circuit topped up for months has sludge in it and wants a power flush in Barnet after the leak is fixed. Water at a gully or a manhole is drainage.
Frequently asked questions
My boiler keeps losing pressure. Nearly always a leak on the heating circuit, occasionally the boiler itself. The boiler is checked first because it is the cheapest place to look.
Related: leak detection across our whole area, all our services in Barnet, bathroom renovation in Barnet.
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Frequently asked questions
Can you find a leak on a supply pipe under a long drive?
Yes. Acoustic listening along the run, confirmed with tracer gas, marks the spot without excavating the length of it.
And under a concrete floor?
Camera for a hot pipe, microphone for a pressurised one, tracer gas where neither is conclusive. One opening, where the leak is.
Do you carry out the repair too?
Yes. The repair is quoted as its own fixed figure once the leak is found.
Is this covered by insurance?
Trace and access cover is in most household policies, and our report is written for it.
The damp comes and goes. Why?
Because the water only arrives when something runs: a shower, a washing machine, rain. It is far more likely to be a seal, a waste pipe or rainwater than a supply pipe, and the moisture readings decide.
How do you find a hidden leak without digging up the floor?
With thermal imaging, acoustic listening equipment and tracer gas, in that order. Thermal imaging shows the temperature change a leak leaves under a floor or behind a wall, acoustic equipment picks up the sound of escaping water in pipework, and tracer gas finds pinhole leaks the other two cannot. Together they pinpoint the leak so only the spot that needs opening is opened.
How much does leak detection cost in Barnet?
A typical leak trace takes around half a day. We tell you the price on the phone before we book, and once the leak is found you get a fixed written price for the repair before anything is opened up. We provide a full written report with photographs for your insurer.
Will my home insurance pay for leak detection?
Most buildings policies include trace and access cover, which pays for finding the leak and for making good the floor, wall or ceiling that had to be opened to reach it. The repair to the pipe itself is often excluded. Check your policy wording, and use our written report and photographs to support the claim.
Who is responsible for a leak on the water supply pipe?
From the boundary of your property inwards, including the pipe between the outside stop tap and the house, the pipe is yours. The water company is responsible for the mains and the pipe up to the boundary or the meter. If your water bill has jumped and there is no obvious leak inside, the supply pipe is the first thing we test.
Areas we cover for leak detection around Barnet
All of the borough: High Barnet, Chipping Barnet, New Barnet, East Barnet, Monken Hadley, Hadley Wood, Arkley, Cockfosters, Totteridge, Whetstone, Oakleigh Park, Friern Barnet, Mill Hill, Edgware, Burnt Oak, Colindale, Hendon, Finchley, North Finchley, East Finchley, Golders Green and Hampstead Garden Suburb, EN4, EN5, N2, N3, N11, N12, N20, NW4, NW7, NW11 and HA8, plus Potters Bar and Borehamwood.
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