Property & Housing · 26 August 2026 · 6 min read

Leaking Pipes and Water Damage in Hong Kong Flats: What to Do, Who’s Liable, and How to Fix It Fast

Water seepage is one of the most common — and most disputed — problems in Hong Kong flats. Here’s how to trace the source, who’s liable under your DMC and tenancy agreement, and how the Joint Office’s new fast-track process can resolve a case in weeks instead of months.

What Usually Causes Water Seepage in Hong Kong Flats

Most seepage cases come down to defects in plumbing or waterproofing somewhere in the building. The Joint Office (JO) — run jointly by the Food and Environmental Hygiene Department (FEHD) and the Buildings Department (BD) — points to a handful of repeat offenders:

• Leaking drainage pipes, whether in your own flat, the flat above, or a neighbouring unit
• Leaking fresh or salt water supply pipes
• Worn waterproofing on floor slabs, bathtubs, or shower trays
• Rainwater getting in through roofs, balconies, external walls, or window frames

Older buildings are especially prone to this, since ageing pipework and years of piecemeal renovation work tend to compound the problem.

It’s Not Just Individual Flats — Hong Kong’s Mains Are Under Strain Too

Leaks inside a flat tend to make headlines only when a dispute drags on, but Hong Kong has seen a string of larger watermain failures this month that put the same underlying issue — old, deep, hard-to-access pipework — in the spotlight citywide.

• On 2 August 2026, a 200mm fresh water supply main burst under a footpath in Kwai Chung, cutting off water to Po Sing Centre. The Water Supplies Department (WSD) trucked in temporary water tanks and bottled water for affected residents and shops while crews carried out emergency repairs, restoring supply by that evening.
• On 11 August 2026, an 800mm salt water main leaked on Hoi Kwai Road in Tsuen Wan. WSD said the pipe sat unusually deep and beneath a dense tangle of underground utilities, forcing crews to dig and clear rock by hand — a good illustration of just how disruptive even a routine pipe repair can become once you’re dealing with decades-old infrastructure.

Neither incident is directly comparable to seepage inside a private flat, but they’re a useful reminder for owners and tenants alike: pipework across the city is ageing at roughly the same pace, and the “it’s just an old building” excuse from a neighbour or management office often has more truth to it than people assume.

What to Do the Moment You Spot Water Damage

Damp patches, peeling paint, or water dripping from a ceiling or wall are all signs to act on quickly:

1. Document everything. Photograph and film the damage, note when it appeared or worsened, and save any messages exchanged with neighbours or management — you may need this evidence later.
2. Notify your property management company. They can inspect common areas and arrange access to the flats above or beside yours if the leak seems to originate there.
3. File a complaint with the Joint Office if the source looks like it’s coming from another unit and management is unable to resolve things directly.

The New Fast-Track Investigation Process (From July 2026)

To address long-standing complaints about delays, Hong Kong rolled out a streamlined investigation process for private buildings on 16 July 2026.

Stage I — Rapid Screening (~14 working days)

• The JO uses infrared thermography and electronic moisture meters to assess the seepage and narrow down its likely source.
• If the flat above is suspected, the JO issues a Notification Letter within roughly 14 working days, giving that owner 28 calendar days to inspect and repair.

Stage II & III — In-Depth Testing (If the Leak Persists)

• If the seepage hasn’t stopped after 28 days, the JO moves to more advanced testing — such as microwave leakage detection — and may issue a Nuisance Notice under the Public Health and Municipal Services Ordinance (Cap. 132).
• Ignoring the notice can lead to prosecution, a court-ordered Nuisance Order, and recovery of inspection costs — at least HK$17,000 — from the owner of the upper unit.

The goal of the new framework is to settle straightforward cases in a matter of weeks rather than the months it used to take.

Who’s Actually Liable?

Responsibility hinges on where the leak starts and what your building’s Deed of Mutual Covenant (DMC) says.

Under the Building Management Ordinance, owners are required to keep their exclusive areas in good repair — even if the DMC says nothing about it directly.

Tenants vs. Landlords: Heading Off a Dispute

Most tenancy agreements split things fairly predictably: structural maintenance (like external waterproofing) falls to the landlord, while day-to-day upkeep (like clearing a drain) falls to the tenant.

A few habits that go a long way toward avoiding arguments later:

• Report leaks in writing, as soon as you notice them
• Keep every message and photo, even ones that seem minor at the time
• Spell out in the tenancy agreement who’s responsible for plumbing repairs
• Consider home insurance with third-party liability cover for accidental water damage to neighbours or common areas

Worth noting: insurance typically covers the damage the leak causes (ruined flooring, for example) — not the cost of fixing the leak itself.

When to Bring in Mediation or Legal Help

If a neighbour or landlord simply won’t engage, you still have options:

• eBRAM’s pro-bono online mediation service, set up specifically for water seepage disputes
• A solicitor, who can send a formal demand letter or help you pursue a civil claim for damages and repair costs

Preventing Leaks Before They Start

• Book regular plumbing inspections, particularly in buildings over 30 years old
• Reapply waterproofing sealant in bathrooms every few years
• Fit water leak detectors or smart sensors for early warning
• Steer clear of unauthorised alterations that could compromise waterproofing or drainage