Bought a Flat and Found a Hidden Leak? Chasing the Seller in Hong Kong

You've barely moved into your newly purchased flat when you spot an odd patch in a corner — scratch at the paint, and underneath is a long-dried water stain. Ask around, and a downstairs neighbour mentions the seller already knew about the leak before putting the flat on the market — and may even have repainted specifically to hide it. What stings most here usually isn't the leak itself; it's the sense of being played — if you'd known, you might not have paid what you did.

This guide draws on public materials from CLIC (the Community Legal Information Centre), the Consumer Council, the Hong Kong Judiciary and the Joint Office for Investigation of Water Seepage to explain what an "as is" clause actually protects, the legal basis for a concealed-defect claim, how to gather evidence the seller knew, and which claim amounts fit which forum. If you'd like the general water-damage claim process first, see our complete guide to water-damage claims.

Does "As Is" Mean You Bear It All?

Hong Kong second-hand property sale agreements typically state the property is sold "as is." In practice, this shifts the risk of a defect a buyer could reasonably have found through inspection onto the buyer — in other words, if you didn't inspect before buying, or your surveyor missed something that was actually visible, trying to recover afterwards on the basis that "the contract never mentioned it" has a low chance of success.

Who does "as is" actually protect?

"As is" protects a seller from liability for a problem the seller genuinely didn't know about, or one a reasonable inspection wouldn't have found. But that shield has a clear boundary: a seller who knew about a problem and actively concealed it, or made a false statement about it, is not protected by an "as is" clause. A seller who deliberately repaints before a viewing to hide a water stain, and a seller who genuinely had no idea there was a leak behind the ceiling, are not the same thing in law — the first deliberately created a false impression; the second is exactly the kind of risk the "as is" clause was meant to allocate.

In practice, "concealment" can take several forms. Some sellers are blunt about it — repainting right before moving out and blocking the corner with a wardrobe during viewings. Others are subtler — a downstairs neighbour mentioning something like "they're selling soon, talk to the next owner," which isn't a lie on its face but, combined with other signs, can still point toward knowledge. Distinguishing "a reasonable inspection should have found it" from "the seller took action to hide something a reasonable inspection would otherwise have found" is often what decides the whole claim — if the defect was something an ordinary person, or a surveyor doing a normal inspection, would likely have noticed, a court tends to treat that as the buyer's own risk. But where the evidence shows the seller took concrete steps (fresh paint, blocking furniture) to make an otherwise-visible problem invisible, that's a materially different situation.

The Legal Basis for a Concealed Defect

Once you understand that "as is" isn't a blanket shield, the next question is: what can you actually claim on, if the seller did conceal something?

What's the legal basis for a concealment claim?

The answer is misrepresentation. Per CLIC, a person who makes a false statement of fact that induces another to enter into a contract commits a misrepresentation — three elements are required: (i) a statement of fact was made, (ii) the statement was false, and (iii) it induced the innocent party to enter into the contract. The Misrepresentation Ordinance (Cap. 284) lets the misled party apply to court to rescind the contract and claim compensation.

"Concealment" and "a false statement" sound different, but in this type of case they often overlap. If a seller was asked directly at a viewing "has this ever leaked?" and lied, or deliberately covered up signs so you'd believe the flat had no issue, both can form the factual basis for a misrepresentation claim. On rescission: since a property transaction is usually already completed and title already transferred, actually asking a court to unwind the entire deal is rarely realistic — which is why, as covered below, most claims in practice pursue money compensation rather than reversing the transaction itself.

Proving the Seller Knew

This is the part of the whole process that genuinely takes the most work. The legal theory isn't hard to grasp — proving it is what's difficult, and you need to satisfy an adjudicator with more than a guess.

What evidence is most persuasive on "concealment"?

A few types of evidence are relatively common and relatively achievable to gather:

• Mismatched paint or renovation age: if the suspect corner's paint looks noticeably newer than the rest of the flat, ask a surveyor or contractor for a written opinion connecting the paint's age to the water stain
• A prior complaint record from a downstairs or nearby unit: if a resident had already reported seepage to the Joint Office for Investigation of Water Seepage before your purchase, that record can indirectly support that the seller should have known
• Message records with the seller or agent: WhatsApp, email, texts — particularly if you asked "has this leaked before" and how they responded; keep the original wording, don't just paraphrase from memory
• Maintenance records from the management office or Owners' Corporation: if the building has a repair request or complaint record tied to your unit or an adjacent one over seepage, it's worth checking

It's worth reading our case study Three Years of Ceiling Leaks, No Compensation — Until a Tribunal Filing Recovered It at this point — while that illustrative case involved a landlord-tenant repair dispute rather than a purchase concealment, the evidence-organising method it shows is the same: laying out scattered conversations and photos in date order until an adjudicator can immediately see who knew what, and when. Your case is slightly different — you're proving "the seller knew and didn't tell you," not "the landlord knew and didn't fix it" — but the underlying logic of building the evidence is identical.

If you're already assembling evidence and want a fuller checklist and presentation format, see our complete guide to preparing evidence.

It's also worth noting that even where the Joint Office has previously investigated, its role is limited to determining whether the seepage amounts to a public-health nuisance — it does not reach a conclusion on whether a former owner knew about it. In other words, a Joint Office record at most proves "this unit genuinely leaked, and there's a dated record of it"; whether the seller knew and concealed it still rests on the other evidence above. Combining an official record with your own private evidence is what builds a complete account.

Is the Estate Agent Liable Too?

Beyond the seller, it's worth thinking through whether the estate agent who was present throughout viewings carries any liability as well.

If the agent knew and said nothing, are they on the hook?

An estate agent has a duty to exercise reasonable care during viewings and when answering a buyer's questions, and a responsibility to make reasonable enquiries before answering. Per the Consumer Council, if an agent makes a false statement about a property's condition that induces a buyer to purchase and causes loss, the buyer can claim compensation from the agent under the Misrepresentation Ordinance. But an agent's liability isn't unlimited — if the false statement wasn't made deliberately by the agent, the agent may not be liable for every loss the buyer suffers; conversely, if the seller was present at the viewing and stayed silent about a known defect, the seller can share liability too. In short, the seller isn't necessarily the only party worth pursuing — the agent's actual role during the sale is worth weighing as well.

Tribunal or District Court — Where Should You File?

Once the legal basis and evidence are in order, the last step is genuinely practical: how much are you claiming, and where does it belong?

How does the claim amount map to the right forum?

First, a reality check: since the transaction has already completed, asking a court to unwind the whole deal is rarely realistic, so in practice most claims pursue money compensation instead — repair costs, or the reduction in the property's value caused by the defect, claimed against the seller (and/or the agent). Per the Hong Kong Judiciary, the Small Claims Tribunal deals with monetary claims not exceeding HK$75,000; a claimant may not artificially split a larger claim to fit within that limit, but may choose to abandon the excess in order to bring the remainder to the Tribunal. For the Tribunal's actual filing process, see our complete guide to the Small Claims Tribunal's HK$75,000 limit.

It's worth being upfront: a claim involving a property defect — repair costs plus the drop in the flat's value — can easily exceed HK$75,000. If your estimated loss goes beyond that ceiling, you'll need to consider the District Court instead — the process differs from the Tribunal's, and it's generally worth getting legal advice first. For the basics of the recovery process itself, such as writing a formal demand letter or whether there's a time limit, see our demand letter guide. If you'd like someone to walk the whole process with you, see what our filing assistance service actually covers, or browse more on how a water-leakage claim plays out in practice.

What can you do differently on your next purchase?

Recovering here is a repair after the fact; longer term, one extra step before your next purchase can save you the whole ordeal. It's worth commissioning a surveyor for a leak-specific inspection before signing the provisional agreement, not just a general walkthrough, and — budget permitting — negotiating a written leak-disclosure or warranty clause into the formal agreement requiring the seller to confirm in writing whether the unit has any seepage history. Not every seller will agree to sign one, but if they do, it resolves half of the "did the seller know" problem in writing before a dispute ever starts.