Leak Detection in Harlow
Locate the leak before anybody lifts a floor
Taking up flooring on a guess is how a small leak turns into a big bill. We find leaks with thermal imaging, acoustic detection, tracer gas and moisture measurement, so if anything does have to come up, it comes up in one small place, once.
Vantage Plumbing and Heating covers Harlow and the villages around it from our base in Stevenage, about 20 miles away. Gas Safe registered under 956889, genuine 24 hour emergency cover 365 days a year, and a 2 year guarantee on our workmanship.
Vantage Plumbing and Heating covers Harlow from our base in Stevenage. We are Gas Safe registered under 956889, we carry the common parts on the van, and we guarantee our labour for 2 years.
Why Harlow is a solid floor town, and why that matters for leaks
Harlow was designated a new town on 25 March 1947 and the bulk of it was built at speed between roughly 1950 and 1965, planned by Frederick Gibberd across the old parishes of Harlow, Latton, Netteswell, Great Parndon and Little Parndon. The population went from 4,500 at designation to 78,000 by 1971. That building programme fixed the character of the housing stock, and it fixed the character of the leaks.
Most of that stock is two storey terraced houses and maisonettes with solid ground floors, and heating pipework from that era is small bore, with microbore arriving in the later phases. A great deal of it was run in or under the screed, often without sleeving where pipes pass through concrete. When a pipe like that fails, there is nothing to see. No drip, no stain on a ceiling, just a boiler that keeps losing pressure or a water bill that keeps climbing. The water goes down into the slab and the ground, not out where you can find it by eye.
In a 1930s house with suspended timber floors you can sometimes lift a board and look. In a 1950s Harlow terrace you cannot, and breaking out screed in three wrong places before finding the right one is an expensive way to search.
The water feeding those pipes makes things worse. Harlow is supplied by Affinity Water and the town is split across two of its supply zones. Affinity Water’s published figure for the Harlow North zone is 330 mg/l of calcium carbonate, and 310 mg/l for Harlow South, so around 310 to 330 mg/l depending on which side of town you are on. Both zones are classified very hard. Decades of very hard water and old steel radiators mean corrosion and pinholing in ageing heating circuits, and a corroded system often has more than one weak point. Locating the leak precisely is what stops the floor being opened twice.
The signs, in the order Harlow homeowners notice them
The water bill. An Affinity Water bill that jumps with no change in the household is the most common first call. If the meter keeps turning with every tap and appliance off, water is escaping somewhere.
Boiler pressure dropping. Topping the system up every week or two with nothing visible under any radiator almost always means a heating leak into a solid floor.
A warm patch of floor. Heating water escaping under screed warms the slab above it. People often notice it in bare feet before they read it as a symptom.
Damp at the base of a wall that never dries. Regularly misdiagnosed as rising damp or condensation when the cause is a pipe a metre away.
A hiss in a quiet house. Usually near the incoming main, clearest at night.
One Harlow specific caution. The town has a documented history of surface water flooding, and the Harlow Surface Water Management Plan names nine Critical Drainage Areas, among them Sumners, Kingsmoor, Stewards, Latton Bush, Brays Grove, Netteswell, Victoria Gate, Rivermill and Old Harlow. In those areas, low level damp after heavy rain is not automatically a plumbing leak. Part of our job is proving which it is.
How we actually find it
Thermal imaging. A thermal camera displays the temperature pattern spread across a floor or wall. A heating leak under the screed shows up as a warm plume, while a cold mains leak reads as a cold anomaly. The camera reads surface temperature rather than seeing through concrete, so we use it alongside the other methods, but on Harlow’s solid floored terraces it is usually the first tool out of the van and often the one that settles it.
Acoustic detection and correlation. Ground microphones and correlators pick up the noise a pressurised leak makes. Correlating between two contact points on a buried supply pipe narrows the fault to a short section, which is the difference between a small hole in a front garden and a trench across a drive. It works best on metal pipe. Sound doesn’t travel well through plastic, so on plastic pipe runs we switch to tracer gas instead.
Tracer gas. Where a circuit can be isolated and drained, we charge it with a hydrogen and nitrogen mix, harmless and non flammable at the concentration used, which escapes through the smallest defect and is picked up at the surface with a gas detector. For pipework buried in a 1950s slab, this is the method that finds what nothing else will.
Moisture meters and hygrometers. For mapping how far the water has travelled, separating a live leak from old residual damp, and confirming afterwards that the building is drying so you know the repair worked.
Isolation and pressure testing. Sometimes the quickest route is methodical isolation, valve by valve, to prove whether the loss is on the heating, the hot water or the cold main.
The leaks we find most often in Harlow
Heating pipework in the slab. The signature Harlow fault, for the reasons above. Corrosion where an unsleeved pipe passes through concrete, and pinholes in old small bore and microbore runs.
Buried private supply pipes. The pipe from the boundary into the house belongs to the homeowner, not Affinity Water, which surprises most people. In Old Harlow’s period stock that pipe can be lead or old iron, and anywhere in town it can have been buried under a drive or a later extension.
Underfloor heating. Common in Newhall, where the first phase of around 500 contemporary homes completed in 2009, and in extensions and refurbishments across the town. A UFH loop leak can be pinpointed thermally with real accuracy, so one small area of screed is opened rather than the whole floor.
Shower trays and wet rooms. A good share of calls that arrive as plumbing leaks are sealing failures: water tracking past a tray edge, a failed waste seal, or tanking that was never continuous. No amount of pipe testing finds those, so we test the tray and enclosure separately and tell you plainly if that is what it is.
Concealed joints behind boxing and tiling. Anything hidden during a refit without an access panel.
The properties where the job gets more interesting
Mark Hall North. The new town’s first completed neighbourhood, early 1950s, with its centre at The Stow, and a conservation area since 1987. The stock here has the oldest buried services in the new town, and because it is a conservation area, anything that affects the outside of the building needs more care. Precise location matters even more when reinstatement has to be sympathetic.
Bishopsfield and Charter Cross, known locally as The Kasbah. The 1961 patio housing stepping down its hillside, with an underground car park and tight pedestrian access. Getting equipment and materials in is a job in itself, and the slope means escaping water travels downhill through the structure and shows up well away from the source. The wet patch is rarely above the fault here.
The Chantry. Early 1950s houses by Maxwell Fry and Jane Drew, with rendered fronts. Damp behind render can sit unnoticed for a long time, and a leak that would stain brickwork visibly can hide behind it. Thermal imaging and moisture mapping do the work the eye cannot.
Old Harlow and Churchgate Street. The historic village at the north east of the town, both conservation areas, with the genuinely old stock and the oldest supply pipes. We work non-invasively here as a matter of course. Old Harlow is also one of the named Critical Drainage Areas, so separating a supply leak from surface water is a live question after wet weather.
Church Langley. The big expansion built out through the 1990s between the A414 and the M11, around 3,500 homes in CM17 by sixteen different housebuilders. Sixteen builders means sixteen sets of plumbing habits, and the common faults are concealed pushfit joints and shower installations now 25 to 30 years old.
Insurance, trace and access, and what to do first
Many buildings insurance policies include trace and access cover, which relates to the cost of finding the leak and reinstating what was opened to reach it, as distinct from the pipe repair itself. Policies differ and we are not going to tell you what yours covers, because that is between you and your insurer. Look through your schedule for trace and access wording, then speak to your insurer before committing to work. The report we supply covers our findings, the thermal images and exactly where the fault sits, in the form your insurer needs.
If water is escaping right now, turn off the stopcock and call us on 01462 506374. If it is a heating leak, switch the boiler off and stop topping up the pressure. Each top-up simply means more water going into your floor.
What it costs
We price a detection visit as a job rather than by the hour, so you know your commitment before we begin. Cost is shaped by the size of the property, which system is suspected, and whether the run sits inside or is buried outside. Repairs are quoted separately once the fault is located, because any repair price given before that would be guesswork. If the problem turns out to be a sealing failure or surface water rather than a pipe, we say so.
Trusted & Accredited Professionals
Related work in Harlow
We are plumbers first, so we repair what we find: buried heating pipework, private supply pipe renewal including lead replacement in Old Harlow, underfloor heating repairs, and shower tray and tanking rebuilds. Where an old system turns out to be full of sludge rather than holed in one place, see power flushing in Harlow. Where the water is coming from a drain rather than a supply, see drainage services in Harlow, and for everyday work across town, general plumbing in Harlow.
Why choose Vantage
One firm to find it and fix it, rather than a detection company that hands you a grid reference and leaves. Gas Safe registered under 956889. Covering Harlow from Stevenage, around 26 minutes up the road, alongside the rest of Hertfordshire, Bedfordshire and Cambridgeshire. Written reports suitable for insurers. Genuine 24 hour emergency response, 365 days a year. Electrical work is carried out by qualified electricians and certificated as part of the job. A 2 year guarantee on our workmanship.
Areas we cover for leak detection around Harlow
All four Harlow postcode districts, CM17, CM18, CM19 and CM20, including Old Harlow, Church Langley, Newhall, Mark Hall North, Netteswell and Great Parndon, plus Roydon, Nazeing, Epping, North Weald, Hastingwood, Matching Tye, Matching Green, Sawbridgeworth, Gilston, Eastwick, Hunsdon and High Wych.
Nearby: Leak detection in Bishop’s Stortford · Leak detection in Hoddesdon · Leak detection in Broxbourne · Leak detection in Great Dunmow
Why Choose Vantage?
With a 4.9 rating on Google and more than 700 reviews across Google, Checkatrade and Trustatrader, fully qualified and accredited engineers, transparent pricing, and a 2-year labour guarantee on every job, Vantage delivers reliable, high-quality workmanship you can trust with fast response times, and genuine local service.
- Five-star Google reviews
- Gas Safe Registered No. 956889
- CHAS Registered
- City & Guilds qualified
- Checkatrade approved
- 2 year labour guarantee on every job
- Fully stocked vans most jobs fixed on the first visit
- Established local business with a dedicated office team and multiple qualified engineers
- No job too small
- Transparent pricing with a fixed price provided before any work begins
- 700+ reviews across Google, Checkatrade and Trustatrader, 4.9 on Google
Frequently Asked Questions
Will you have to break out my solid floor?
Not to find the leak. We locate the fault first, using thermal imaging, acoustic tracing and tracer gas. If a repair then needs access, it is one small, targeted opening in a known position, which matters in a town where most ground floors are screed over concrete.
My boiler keeps losing pressure but I cannot see water anywhere. Why?
In most Harlow houses the heating pipework runs in or under a solid floor, so the water goes down into the slab and the ground instead of appearing as a drip. Pressure loss with nothing visible is the classic sign of a leak under screed.
Whose job is the pipe between the road and my house?
Yours. Affinity Water is responsible for the network up to your boundary, and the supply pipe from the boundary into the house is the owner’s responsibility, including repairs.
Is the damp in my downstairs room a leak or flooding?
It can be either in Harlow. Parts of the town, including Old Harlow, Brays Grove and Netteswell, are named Critical Drainage Areas with a history of surface water flooding. We test the plumbing properly so you find out which it is before paying for the wrong fix.
Will my insurance cover the detection work?
That depends on your policy and your insurer, not on us. Look for trace and access cover in your schedule and speak to your insurer before work starts. We provide the written report that insurers ask for.
How long does a visit take?
Typically two to four hours. Tracer gas work on a buried slab run takes longer than a straightforward thermal survey, and we would rather cross check two methods than open a floor on one reading.
Suspect a leak in your Harlow home?
Call 01462 506374. We will find it without taking the house apart, and because we are plumbers, we can usually fix it too.