Pressure testing and data logging are usually used when there is a strong suspicion of a hidden leak, but the cause has not yet been confirmed. This method is especially helpful where pipework is concealed, symptoms are inconsistent, or evidence is needed before moving on to more targeted tracing methods.
- A system is losing pressure over time
- A leak is suspected but not visible
- Other detection methods are inconclusive
- Pipework is underground or inaccessible
- The issue is intermittent or slow developing
- Evidence is required for insurance purposes
Every property and plumbing system is different, so the exact approach depends on the layout, access available, and the symptoms reported. In most cases, the process begins with an assessment of the pipework and a decision on which section of the system should be isolated and tested first.
- Initial assessment of the system and reported symptoms
- Isolation of the pipework or system section to be tested
- Controlled pressure testing using calibrated equipment
- Monitoring for pressure loss over a defined period
- Digital data logging where longer-term behaviour needs to be recorded
- Interpretation of results and recommendation of next steps
If a pressure loss is confirmed, this helps establish that the leak is real and not simply a normal fluctuation within the system. From there, the results can be used to decide whether tracer gas, acoustic testing, thermal imaging, or another method is the most suitable next step.
Digital data logging helps us see how a system behaves over time, rather than relying on a single pressure reading taken at one moment. This is useful where the leak is small, inconsistent, or only shows itself under certain conditions.
- Gradual or intermittent pressure loss
- Whether a leak appears to be active during the test period
- The difference between normal system fluctuation and a genuine fault
- Whether the pressure drop is steady, sudden, or changing over time
- Supporting evidence for insurers, clients, or further investigation
In many cases, data logging provides the evidence needed to move forward with confidence, especially where the leak is not visible and access is limited.
Pressure testing and data logging are useful across a wide range of domestic and light commercial leak detection work. They are particularly valuable where the leak is concealed and the symptoms suggest a pressure-related fault rather than a visible plumbing failure.
- Underfloor heating systems losing pressure
- Underground mains water supply leaks
- Intermittent leaks with no visible surface signs
- Systems losing pressure overnight or over several days
- Hidden pipework within floors, walls, or external runs
Pressure testing is an important part of leak detection because it helps confirm whether a system is losing pressure under controlled conditions. However, it does not always identify the exact physical location of the leak on its own.
A confirmed pressure loss tells us that there is likely a fault within the section tested, but further tracing methods may still be needed to pinpoint the leak accurately. Depending on the type of system and the access available, this may include tracer gas, thermal imaging, digital acoustic detection, or other non-invasive techniques.
For that reason, pressure testing is often used as part of a wider leak detection strategy rather than as a standalone solution in every case.
Professional pressure testing uses calibrated equipment, controlled procedures, and experienced interpretation of the results. This is important because pressure movement on a plumbing system can be misunderstood if the test is not carried out correctly or if the wrong section of pipework is being assessed.
By using a structured testing process, we can reduce guesswork, avoid unnecessary disruption, and provide a clearer direction for the next stage of investigation. In many cases, this saves time and helps avoid opening floors, walls, or external surfaces without proper evidence.
Where required, the findings can also support insurance claims, further specialist investigation, or repair planning.
We use a combination of specialist leak detection methods, selected based on the system and access available, to support the investigation.Each method is selected based on the specific conditions of the property to ensure accurate results with minimal disruption.
We provide pressure testing and data logging leak detection in North London for domestic properties, light commercial buildings, and concealed plumbing systems. This service is particularly useful where pipework is underground, beneath floors, within walls, or otherwise difficult to access without unnecessary disruption.
If your system is losing pressure and the source of the problem is unclear, pressure testing can help confirm whether a hidden leak is present and guide the next stage of investigation.
