When this method is useful
It can help compare heating circuits or other appropriately isolated plumbing sections. The method, pressure, duration and equipment must suit the system and its condition.
What happens during the investigation
The engineer reviews the isolation arrangement, records relevant conditions and observes the section. A result is interpreted with the behaviour of valves and connected components rather than treated as a standalone verdict.
What it cannot establish on its own
A pressure change does not identify the physical position of a leak. Temperature, trapped air, passing valves and testing arrangements can influence the result. Testing must be suitable for the installation.
How we combine the evidence
Once a suspect section is supported by evidence, thermal, acoustic or tracer methods may help narrow the actual location.
Good detection is a sequence of decisions. We use the observations to narrow the question, check whether the results agree and explain the practical implications before proposing access. This helps you understand the reason for the work rather than simply seeing a piece of equipment in use.
Preparing for the visit
Provide access to known isolation points and relevant system information. Do not attempt an improvised pressure test or disconnect safety devices.
The method is part of the service
The engineer selects suitable methods within the agreed investigation. Our £1,750 residential package also includes necessary access or excavation, the plumbing repair, parts, materials, appropriate retesting and an Written Trace & Access report. It is not a promise to use every listed technique at every property.
All our work within the agreed scope has a one-year workmanship warranty. Decorative and remedial reinstatement is excluded. Commercial work receives an individual quotation.
Documenting useful findings
Where a result supports the investigation, the report explains its relevance to the source, access or repair. Photographs are included where appropriate. The report can support an insurance submission, but your insurer determines eligibility and reimbursement under your policy.