Finding leaks behind walls and pipe boxing

A wall can conceal the pipe and the path taken by escaping water. The first task is to establish which system is involved and where it runs, before choosing an inspection or repair opening.

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Describe the whole affected area

Useful observations include recurring paint damage, a damp skirting line, staining near a ceiling and a wall that becomes wetter after fixtures are used. Identify the rooms on both sides of the wall and any bathroom or pipework above it.

Boxing may carry several services through the same space. A wet patch alongside it does not establish which pipe, joint or fixture is responsible. Water can travel before a stain appears.

Identify the pipe route before opening

In the Exeter kitchen, thermal imaging mapped heating routes while initial gas and listening checks were inconclusive. Further gas testing gave a clearer indication at the boxing, and an endoscope confirmed pipework inside. Opening that area then revealed a separated fitting.

The case shows different tests answering different questions: where pipes run, where a signal appears and what is actually inside the void.

An inspection hole and a repair opening serve different purposes

A camera may fit through a small opening, but that does not mean the same opening gives enough room to remove and replace a fitting. Pipe position, nearby services and the space required to work affect the access needed.

Before work starts, identify finishes you are concerned about and establish who can authorise opening them. Discuss whether boxing panels can be removed, whether an existing hatch helps and what would happen if a larger opening is needed. Do not cut into a wall to prepare for the visit.

Separate the pipe repair from the wall restoration

In Stafford, the concealed pipe was repaired, while drying, wall restoration and reinstating the boxing were follow-on work. In Southampton, access near the kitchen ceiling exposed one leak and another faulty fitting was found beneath the basin.

Those outcomes differ. Read what to agree about access, repairs and making good, and use the survey preparation checklist to organise the information and access needed.

Customers who watched it done

“…behind a plasterboard wall with no obvious evidence that the leak was there.”

J E B., Trustpilot review, 26 July 2023

“…narrowed the search down to a tiny area and did minimal damage to our new bathroom in fixing the leak.”

Andy B., Trustpilot review, 13 December 2024

“…pull up the carpet and floorboards with minimal disruption and everything was put back as it was found.”

Jade, Trustpilot review, 24 June 2025

Read ADI customer reviews

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