Hidden leaks outside residential properties are a significant and costly issue for landlords, with more than half originating beyond the building’s structure. These leaks often go unnoticed for extended periods, leading to increased water wastage and substantial repair bills.

Prevalence of External Hidden Leaks

Analysis of 9,000 callouts by property maintenance firm Aspect reveals that 58% of hidden leaks occur in underground mains supply pipes located outside the property itself. While many leaks are commonly associated with internal plumbing or heating systems, the data shows that nearly six in ten cases actually begin in pipework buried beneath gardens, driveways, or boundary lines.

Aspect operates across London and the South and East of England, highlighting that this is a widespread concern rather than a regional anomaly.

Challenges in Detecting External Leaks

Neil Lampton, Aspect’s leak detection manager, explains that hidden leaks outside the home are particularly difficult to identify because they develop underground without visible signs. “They are often mistaken for internal plumbing or heating faults, which can delay diagnosis and increase costs,” he said.

Lampton emphasises the importance of recognising external supply pipes as a key risk area. Since landlords are responsible for these pipes rather than the water supplier, greater awareness can lead to more targeted and cost-effective maintenance strategies.

Consequences of Undetected Leaks

The location of these leaks means they can continue unnoticed for long periods, as tenants may not observe any immediate signs of water loss. This results in significant water wastage, with recent data indicating that hidden leaks can waste approximately 56 litres of water per hour, equating to over 40,000 litres each month.

Responsibility for the external pipes generally falls on the property owner, meaning landlords bear the financial burden of both investigating and repairing these faults.

Financial Impact on Landlords

Repair costs for leaks that have been running for a month typically range from £150 to £160. More severe cases can see costs rise to between £200 and £250. If left unresolved over a year, these leaks can push water bills towards £2,400 to £3,000.

For tenants in metered homes, the first indication of a problem may be unexpectedly high water charges. Unaddressed leaks can escalate into tenant complaints, disputes, and further maintenance issues, adding to landlords’ challenges.

What this means for landlords

Landlords are advised to monitor for sudden changes in water usage, pressure drops, or unexpected bills reported by tenants. Acting promptly on supplier alerts and regularly checking external pipework can help mitigate risks.

Where necessary, landlords should arrange specialist leak detection services to identify and resolve hidden leaks before they cause extensive damage or financial loss.

Source: Based on reporting from Property118

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