24/7 Technical Response
Emergency Plumber London
The first job on an urgent visit is not the repair. It is control: identifying the valve that governs the failure and closing it, so that the loss stops while everything else is worked out. That sounds obvious and it is regularly the step that does not happen, usually because nobody on site knows which valve does what and the search takes place while water is still arriving.
Quick answer
The first job on an urgent visit is control rather than repair: finding the valve that governs the failure and closing it, then recording what closing it proved. Where nothing is visible the visit becomes diagnostic, and circuits are eliminated one at a time rather than a ceiling being opened at the damp patch. What the visit is worth later is what was written down while it happened.
What builds the fee on an urgent attendance
| Stage of the survey | What sets the fee | What lengthens it |
|---|---|---|
| Locating and operating the controlling valve | Whether the stop tap is known, reachable and turns | Seized taps, boxed in valves and communal risers needing access |
| Making safe and containing | Extent of the immediate risk to electrics, ceilings and demises below | Water still moving through a structure when we arrive |
| Eliminating circuits rather than opening structure | How many wet systems there are to isolate and watch | Systems with no isolation, which must be tested indirectly |
| Moisture baseline and written position | How far the record must go for the next party to act on it | Several demises affected, each needing its own readings |
| Repair, quoted once the failure has been seen | What the exposed defect actually turns out to be | Access, substrate and whether more than one section has failed |
We do not publish a price list, because the figure is built from the property rather than picked from a menu. The detection fee is confirmed in writing before an engineer travels, and repair is quoted separately once there is a located point to quote against.
After control the visit divides. Where the failure is visible, the work is a repair decision and can be scoped on the spot. Where nothing is visible, the visit becomes a diagnostic one and the same discipline applies as on any survey: isolate circuits one at a time, watch what falls, and resist the urge to open a ceiling because that is where the water appeared. Water surfaces at the lowest hole in the structure, which is frequently nowhere near the breach.
For landlords, freeholders and managing agents, what determines whether this visit is useful in three months is what got written down while it was happening. Which valve was closed and at what time, what was wet and how wet on a named scale, which circuits were isolated and which continued to fall, and what remained untested when the engineer left. A make safe with no record becomes an argument. A make safe with a record becomes the first page of the file.
What the attendance covers, and what it does not, is agreed in writing before an engineer travels, including whether the visit is a make safe, a diagnostic survey or both. Detection is priced and recorded separately from repair, so that the decision to open a structure is never influenced by what it earns. Repair is quoted once the failure has been seen rather than estimated from a description on the phone, and anything that lengthens the visit, such as a seized or shared stop tap or a demise we cannot get into, is reported rather than absorbed silently into the bill.
What you get
- Acoustic leak detection for pinpointing pipe breaches under floors and behind walls without excavation.
- Thermal imaging surveys to visualise temperature anomalies from water ingress in underfloor heating and cavity walls.
- Tracer gas (hydrogen/nitrogen mix) injection for locating leaks in pressurised and complex pipe networks with zero residue.
- Electronic moisture mapping to document the exact extent of water damage for insurance reports.
- CCTV drain surveys for diagnosing and locating blockages or collapses in underground drainage systems.
- Pressure testing equipment to systematically isolate and verify leaks in specific pipe sections post-repair.
How it works
A method, not a guess
01
Isolate, and treat the isolation as a test
The controlling valve is found, closed and recorded, along with what it actually governs, which is often not what the label says. Whether the loss stops when it closes is itself a diagnostic result and it goes in the notes, because a loss that continues after the supply is off is telling you the source is a stored or heating circuit rather than the incoming main.
02
Make safe and contain before anything else
Immediate risk first: electrical accessories and light fittings in the path of water, ceilings holding weight, and the rooms and demises below. Containment is set up so that the damage stops growing while the diagnosis proceeds, rather than the diagnosis being rushed because water is still moving.
03
Eliminate rather than open
Supply, hot, heating and any stored system are isolated and watched separately so the failed one is identified rather than assumed. Openings are made after that, at a point a method agreed on, not at the damp patch. The distinction is the difference between one hole and three.
04
Leave a written position, including what is unfinished
What was done, what is now isolated and what that means for the occupier, moisture readings taken as a baseline with the instrument named, and an explicit list of what has not yet been tested. Naming the unfinished part is what allows the next visit, whoever carries it out, to start from evidence rather than from the beginning.
Before you book anyone
Six things worth knowing before you make an urgent plumbing call
01
Find the stop tap now, while nothing is wrong
This is the most repeated piece of advice in every discussion of domestic water failures, and it is repeated because it works. Knowing where the internal stop tap is, and confirming it actually turns, converts most water emergencies into inconveniences. In older London conversions the tap is frequently buried behind a run of kitchen units, and in flats the controlling valve may sit in a communal riser cupboard that needs an agent to unlock. Both of those are discoveries worth making on a quiet afternoon rather than at midnight with water coming through a ceiling.
02
Be clear whether you are asking for a make safe or a diagnosis
They are different visits with different outcomes and it is worth saying which you want. A make safe stops the loss and stabilises the property. A diagnostic visit establishes what failed and why. Where something is visibly broken the two collapse into one job. Where nothing is visible they do not, and a visit booked as a repair will tend to end at the most plausible looking damp patch. Booking it as an investigation changes what happens in the first hour, which is where the outcome of the whole job is decided.
03
Ask what will be written down while the work is happening
For a homeowner this may not matter. For a landlord, a leaseholder or a managing agent it is frequently the only thing that matters three months later, because by then the water is gone and what remains is a disagreement. Which valve was closed and at what time, what was wet and how wet on a named scale, which circuits were isolated and which continued to fall, and what remained untested. A make safe with no record becomes an argument. A make safe with a record becomes the first page of a file.
04
Resist the instinct to open the ceiling where the water appears
That is where the structure let the water out, not where the pipe let it go. Water tracks along joists, follows service penetrations and pools on the top side of a plasterboard sheet until it finds a screw line or a downlight, any of which can be metres from the breach. Opening at the visible point reliably produces a hole, then a second hole once the first proves dry, and no diagnosis in between. Isolating circuits one at a time costs less, takes less time than people expect, and actually answers the question.
05
Get the basis of the charge in writing before anyone travels
Not a price list, which nobody can honestly produce for a fault they have not seen, but the basis: what the attendance covers, whether it includes diagnosis or only making safe, what happens if the cause is not established on the first visit, and whether repair will be quoted separately once the failure is actually visible. As a market reference, Checkatrade publishes typical emergency call out charges of £100 to £120 and hourly rates of £95 to £145. A quotation given over the phone for a fault nobody has seen is either padded or about to be revised.
06
Ask whether detection and repair are priced separately
This is a structural question rather than a commercial one. Where the same party both decides that a structure needs opening and is paid for opening it, every uncertainty in the diagnosis has a direction to fall in. That is not an accusation about individuals, it is a description of an incentive, and the way to remove it is to keep the two priced and recorded apart. It is also why a firm that will tell you a leak is not on your side of a boundary, and charge you for establishing that, is worth more than one that always finds work.
Compare like for like
What an urgent first visit should actually establish
An urgent attendance is judged on the wrong thing most of the time. What determines whether the visit was useful is not how quickly it started but what state the property and the paperwork are in when it ends. Here is that comparison across a make safe and leave visit, a firm that opens structure to find work, and the approach here.
| What to check | A visit that starts by scanning | A firm that finds and opens on one price | London Leak Detection 247 |
|---|---|---|---|
| The first action on arrival | A look at the damage while water is still arriving. | An assessment aimed at scoping remedial work. | Control. The valve that governs the failure is found, closed and recorded, and what closing it proves goes in the notes, because a loss that continues after the supply is off points at a stored or heating circuit rather than the incoming main. |
| Containment and immediate risk | Addressed loosely, if at all. | Addressed to the extent the works require. | Electrical accessories in the water path, ceilings holding weight and the demises below are dealt with first, so the damage stops growing and the diagnosis is not rushed by water still moving. |
| When nothing is visible | The ceiling is opened under the damp patch, which is the point the structure leaked from rather than the point the pipe did. | Exploratory opening is proposed as the next chargeable stage. | Circuits are isolated and watched one at a time so the failed system is named. Openings come after a method agreed on a point, which is the difference between one hole and three. |
| What the occupier is told | That it is sorted. | That works are required. | Precisely what is now isolated and what that means for their water, heating and hot water, and what has not yet been tested. An uncertainty that is stated is manageable. One that is not becomes an argument later. |
| What is left in writing | Very little, which is why so many of these visits turn into disputes between a tenant, a landlord and an agent. | A quotation. | Which valve was closed and at what time, what was wet and how wet on a named scale, which circuits were isolated and which continued to fall, and an explicit list of what remains untested. |
| Detection and repair | Blurred into one figure agreed under pressure. | Deliberately bundled, so opening a structure and being paid for it are the same decision. | Priced and recorded separately, so the decision to open a structure is never influenced by what opening it earns. Repair is quoted once the failure has been seen rather than estimated from a phone call. |
Recurring questions
The arguments that come up again and again
Urgent plumbing generates more public complaint than any other domestic trade, and the complaints are remarkably consistent. What is striking, reading across them, is how many describe a failure of sequence and record keeping rather than a failure of workmanship.
Invoices that bore no relation to what was discussed on the phone
The most common grievance by a distance, and the details vary less than you would expect: an indicative figure given before anybody saw the fault, then a considerably larger one afterwards. Our take: the underlying problem is that the first figure was never possible to give. A fault described down a telephone cannot be scoped, and the honest structure is a stated basis for attendance plus a repair quotation raised once the failure has been seen. Any number offered before that is a guess wearing a quotation's clothes.
The advice that comes up in every flooding thread
Find the stopcock, know it turns, and open the lowest cold tap to drain down the pipework above it. It is repeated so often that it has become the folk wisdom of the genre, and it is correct. Our take: we would add one observation. If the loss continues after the internal stop tap is closed, that is a diagnostic result worth passing on, because it means the water is coming from a stored or heated circuit rather than the incoming supply, and it changes what the first hour of the visit should be.
Confusion over who is responsible in a rented flat
Threads about leaks in tenancies frequently conflate two different sets of obligations. Our take: in most residential tenancies the landlord carries a statutory repairing obligation for the installations supplying water, heating and sanitation, while the tenant is expected to act reasonably to limit damage, which in practice means knowing where the stop tap is and reporting promptly. Between flats it is the lease rather than the tenancy that governs, and the boundary between demised pipework and a communal riser is where most of the genuinely difficult disputes sit.
Exploratory opening that found nothing and was charged anyway
A recurring and expensive pattern: a ceiling or wall opened at the point water appeared, nothing behind it, another opening proposed. Our take: this is what happens when a visit skips elimination. Water surfaces at the weakest point of a structure rather than the nearest one, so the visible damage is a poor guide to the pipe. Isolating and watching circuits is slower on the day and dramatically cheaper by the end of the week.
Uncertainty about whether something is urgent enough to call out
People regularly ask whether a situation justifies an out of hours attendance, and the answers tend to be either dismissive or alarmed. Our take: the useful test is whether the loss can be stopped and contained by the occupier. If the stop tap closes and the loss stops and nothing electrical is in the water path, the situation is usually stable until a scheduled visit. If the loss continues with the supply off, or water is in contact with electrical accessories or above a ceiling that is holding weight, it is not.
Questions
Asked before every booking
What should we do before anyone arrives?
Close the internal stop tap if it can be found and turned, open the lowest cold tap in the property to drain down the pipework above it, and switch off anything electrical in the path of the water at the consumer unit rather than at the accessory. If the loss continues after the stop tap is closed, that is a useful observation to pass on when we arrive, because it means the water is coming from a stored or heated circuit rather than from the incoming supply.
We cannot find the stop tap. What then?
Say so at the point of booking, because it changes what the first part of the visit is. In older conversions the internal tap is often buried behind a kitchen unit run or has seized in the open position, and in flats the controlling valve may sit in a communal riser cupboard that needs the agent to unlock. Where the internal tap cannot be operated, the external boundary stop tap becomes the control point, and locating it is the first task rather than an afterthought.
What should a first visit leave us with?
A property that is not getting worse, a clear statement of what is now isolated and what that means for the occupier, moisture readings recorded as a baseline so drying can later be measured rather than asserted, and an explicit list of what remains untested. If the source has not been established, the report should say that plainly and say what the next step is. A visit that ends in a confident guess is worse than one that ends in a documented uncertainty.
In a tenanted flat, who is responsible for what?
In most residential tenancies the landlord carries a statutory repairing obligation for the installations that supply water, heating and sanitation, while the tenant is expected to act reasonably to limit damage, which in practice means knowing where the stop tap is and reporting promptly. Between flats it is the lease rather than the tenancy that governs, and the boundary between demised pipework and a communal riser is where most disputes sit. We report what we found and where it was; we do not adjudicate liability.
Why not simply open the ceiling where the water is coming through?
Because that is where the structure let the water out, not where the pipe let it go. Water tracks along joists, follows service penetrations and pools on the top side of a plasterboard sheet until it finds a screw line or a downlight, and any of those can be metres from the breach. Opening at the visible point produces a hole, a second hole once it is dry behind the first, and no diagnosis in between. Isolating circuits costs less and answers the question.
How much does an urgent plumbing attendance cost in London?
We agree what the attendance covers in writing before an engineer travels rather than publishing a tariff, because what the visit involves depends on whether it is a make safe, a diagnostic survey or both. As a market reference, Checkatrade publishes typical emergency call out charges of £100 to £120 and hourly rates of £95 to £145, with leak detection averaging £162 against a typical range of £115 to £234. Repair is quoted separately once the failure has actually been seen.
What should we do before anyone arrives?
Close the internal stop tap if you can find it and turn it, open the lowest cold tap in the property to drain down the pipework above it, and switch off anything electrical in the water path at the consumer unit rather than at the accessory itself. Move what can be moved out from underneath. If the loss continues after the stop tap is closed, note that and say so, because it tells us the water is coming from a stored or heated system rather than the incoming main.
We cannot find or turn the stop tap. What then?
Say so when you call, because it changes what the first part of the visit is. In older conversions the internal tap is often boxed in behind kitchen units or has seized open through disuse, and in flats the controlling valve may sit in a communal riser cupboard requiring the managing agent. Where the internal tap cannot be operated, the external boundary stop tap becomes the control point and locating it becomes the first task rather than an afterthought.
What should the first visit leave us with?
A property that is no longer getting worse, a clear statement of what is now isolated and what that means for the water, heating and hot water, moisture readings recorded as a baseline so drying can later be measured rather than asserted, and an explicit list of what has not yet been tested. If the source has not been established, the document should say so plainly and say what would settle it. A visit ending in a confident guess is worse than one ending in a documented uncertainty.
Who is responsible for a leak in a tenanted property?
In most residential tenancies the landlord holds a statutory repairing obligation for the installations that supply water, heating and sanitation, and the tenant is expected to act reasonably to limit damage and report promptly. Between flats the lease governs, and the difficult boundary is between demised pipework and communal risers. We record what was found and where it was, described against fixed features of the building. We do not adjudicate liability, because that follows documents rather than instruments.
Can the cause be established on the first visit?
Frequently, where circuits can be isolated and watched. Sometimes not, particularly where a system cannot be taken out of service, where access to an adjacent flat is needed and unavailable, or where the loss is slow enough that a meaningful decay test needs longer than the visit allows. In those cases the useful outcome is a property made safe plus a written statement of what was eliminated and what remains, so the next attendance starts from evidence rather than from the beginning.
London-wide
Covering all 33 boroughs
Related services
Burst Pipes
A burst is isolated, then located precisely, then repaired.
Learn moreLeak Repair
The fault is located with detection equipment before any repair begins, which is why the opening is small and the reinstatement is predictable.
Learn moreLeak Detection
The method follows the building, not the price list: acoustic correlation on mains, thermal on heating runs, tracer gas where neither will reach.
Learn moreWater 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