Leak under the hall, before the stop tap
The property
A newer detached house whose blue plastic supply runs from a boundary meter, under a block paved drive and up through the hall floor.
The problem
The digital meter logged water moving all night. Shutting the stop tap changed nothing, so the owners assumed the drive would have to come up.
How we found it
Moved along the drive, the ground microphone heard the hiss grow towards the house and peak inside the front door. Tracer gas rose through the hall floor there.
The outcome
The leak lay between the wall and the stop tap, which explained the meter. The drive stayed down, and the repair was quoted separately.