Underground Water Leak Detection London

It depends which side of the boundary the leak sits on. The communication pipe running up to the property boundary belongs to the water undertaker. The supply pipe from the boundary to the building is normally the property owner's responsibility, although suppliers including Thames Water will often repair or contribute towards a first leak on an external supply pipe under their published policy. In terraced streets a shared supply serving several properties is common, in which case the owners share both the liability and the excavation. Establish this before instructing anyone, because it occasionally removes the need for a survey altogether.

Yes, but not by listening for it. Blue MDPE absorbs the frequencies acoustic equipment relies on, so a sweep along the route can pass over a substantial leak and register nothing. The workable approach is to trace and bracket the run using sectional isolation where valves allow, then introduce tracer gas into the drained section and detect where it surfaces. Gas needs time to migrate through soil and any surface build up, so this is a slower method than acoustic work on metal and is priced accordingly.

It changes almost everything about the sequence. A shared run means the loss may not originate on your land, the meter reading may not reflect only your consumption, and any excavation may need agreement from neighbours whose surfaces will be disturbed. The useful first step is isolating properties one at a time where valves permit and watching the meter, which apportions the loss before anyone digs. It is also worth involving the water undertaker early, as shared supplies are a situation they deal with regularly.

Closely enough to size an excavation rather than a trench, which in practice means a marked point with a stated tolerance and an estimated depth. Precision falls away with depth, with surface build up, and on plastic pipe, and any firm quoting a single accuracy figure for every job is quoting a brochure. We state the tolerance we are claiming for your specific run and the basis for it, which is the number a contractor actually needs in order to price the dig.

Meter location and any recent readings, the position of the internal stop tap and whether it turns, any knowledge of where the run enters the building, whether the supply is shared, and details of any previous excavation or repair on the route. Site drawings or deeds showing the boundary are useful. If the meter test described above has already been done and recorded, say so, because we will not charge to repeat work that was done properly.

We do not publish a figure, because the fee is built from the length of run, whether its route is documented or must be traced from scratch, what the surface is made of and whether the pipe material forces a second method. As a market reference, Checkatrade's published UK figures put leak detection at an average of £162, a typical range of £115 to £234 and a full spread of £80 to £1,600, with hourly diagnostic rates of £95 to £145. Excavation, repair and reinstatement are quoted separately by whoever performs them, and where the finding falls on the undertaker's side of the boundary the appropriate next step is a claim to them rather than a bill from us.

Normally the property owner, because the supply pipe from the boundary to the building is theirs, while the communication pipe up to the boundary belongs to the water undertaker. Suppliers including Thames Water will often repair or contribute towards a first leak on an external supply pipe under their published policy, so it is worth asking them before instructing anybody. Where a run is shared between several properties, the position is divided and worth establishing early.

Yes, but not by listening for it. Blue plastic absorbs the acoustic frequencies the conventional method depends on, so the run is instead bracketed using sectional isolation where valves allow, and then taken with tracer gas introduced into the drained section and detected where it surfaces. Gas needs time to migrate through soil and any surface build up, so this is a slower and more deliberate method than correlation on metal, and it is scoped that way rather than squeezed into an hour.

The meter sequence is quick and can often be done before we attend. Tracing an undocumented route, establishing the boundary and any shared arrangement, and then bracketing and placing the loss take most of the visit. Plastic pipe and deep runs extend it because gas migration cannot be hurried. Hard surfaces extend it because both tracing and detection have more material to work through.

Closely enough to size an excavation rather than a trench, expressed as a marked point with a stated tolerance and an estimated depth. We state the tolerance for your specific run and the basis for it, rather than a single figure applied to every job, because precision falls away with depth, with surface build up and on plastic. That honest number is what a groundworker actually prices against.

Meter location and any recent readings, the position of the internal stop tap and whether it turns, any knowledge of where the run enters the building, whether the supply is shared with neighbours, and details of previous excavation or repair along the route. Deeds or site plans showing the boundary help. If the meter sequence has already been done and recorded, tell us, because we will not charge to repeat work that was done properly.