Supply pipe under a rear kitchen extension
The property
A 20th-century semi whose single-storey rear kitchen extension sits on a concrete floor laid straight over the old supply pipe's route.
The problem
A letter reported water passing all the time. The house was dry, and the stop tap now sat in a cupboard inside the extension.
How we found it
The dial kept moving with the stop tap shut, so the supply pipe was losing water. Outside, the microphone heard little; tracer gas then rose where the extension floor meets the old wall, and listening there caught the leak.
The outcome
Our mark and photographs went into the report, which the owner used to ask whether their policy's supply pipe cover applied. The repair was priced separately.