Leak Detection in Southwark, London

Victorian terraced properties in Peckham and Camberwell were built as single-family houses and subdivided into flats, typically between the 1960s and 1980s. The floor voids separating each storey were never designed to accommodate contemporary plumbing layouts, and pipe runs from upper-floor bathrooms and kitchens often pass through these voids with minimal sealing. When a joint or section of pipework fails, water collects in the floor cavity before tracking down to the ceiling below. Visible staining rarely sits directly beneath the source — it drifts with the floor slope and structural contours. Clear Flow uses thermal imaging to map moisture within the floor void without lifting floorboards speculatively, so the leak point is confirmed before any access is proposed. This protects both properties from unnecessary disruption and keeps the investigation cost proportionate.

Pressure loss in screed-embedded underfloor heating systems is a frequent callout from the riverside apartment schemes in SE16. New-build developments at Bermondsey Spa and Rotherhithe typically use pipework installed within the concrete screed during construction, and when a joint develops a failure point the circuit pressure drops gradually until the heating becomes ineffective. The source cannot be found visually. Clear Flow engineers first carry out a pressure test to confirm the fault is within the underfloor circuit, then inject tracer gas to pinpoint the precise location within the screed. This allows repairs to be made with a single, targeted opening rather than stripping the floor across the apartment. A full written survey report is provided for the building's service records or for submission as part of an insurance claim.

A trace and access survey is a formal investigation used to locate a concealed leak where pipework is buried beneath floors, within walls, or between ceiling and floor voids. In the conservation areas of Dulwich Village and East Dulwich, where properties are often period-built and subject to Article 4 directions or listed building controls, the non-invasive element is particularly important. Clear Flow engineers combine thermal imaging, acoustic listening equipment, and tracer gas injection to narrow the source location before any physical access is made. Once confirmed, a detailed written report is produced documenting the investigation method, findings, and the specific access point required for the repair. This document is submitted directly to the building insurer as part of the trace and access claim, satisfying insurer requirements without the need for a separate assessor visit.

Georgian warehouse conversions in Bermondsey and Shad Thames present specific challenges: service routes added during residential conversion often run through thick masonry walls or beneath original timber and concrete mezzanine floors. Speculative access into these surfaces risks damaging features that are costly or impossible to reinstate. Clear Flow's approach in SE1 is non-invasive as the default. Thermal imaging cameras detect temperature differentials that reveal moisture movement within masonry and floor structures, while tracer gas detection traces a buried pipe to its point of failure without excavation. Physical access is only recommended once the leak location has been electronically confirmed, and the written report produced alongside clearly documents the justification for that access. This is particularly important in buildings subject to planning or conservation constraints where works records may be scrutinised.

Yes, Clear Flow covers all residential and commercial properties across Southwark, including the large post-war estates around Elephant and Castle in SE17 and Peckham in SE15. These blocks present particular challenges: original pipework is now decades beyond typical service life, communal risers serve multiple dwellings from a single supply, and leak water can travel considerable distances through the building structure before becoming visible. Identifying which dwelling is the source and which section of shared pipework is responsible requires systematic pressure testing combined with acoustic survey techniques. Where a leak originates in a communal service run, Clear Flow produces a report identifying the responsible pipe section and the access required, which can be submitted to the local authority housing team or the building management company to support the remediation and any insurance or recharge process.