The list below splits by what is leaking rather than by what we do, because almost nobody rings up asking for tracer gas. If you can see the water, pick the thing it is coming out of. If you cannot, pick the symptom instead — a bill that has jumped, a boiler that will not hold pressure, a patch of floor that is warm — and the page will tell you which of these repairs it usually turns into.
Every one of them is the same shape of visit. We prove the loss is real and size it, narrow it with acoustic, thermal and non-invasive tracer gas, open the floor or wall once where the leak actually is, repair the pipework, and then our own handymen and builders put back what was opened. It is one firm and one rate across all three stages, which is the part most London leak companies do not do — detection-only outfits hand you a report and a hole, and the plasterer is your problem.