A ceiling leak between flats is miserable precisely because the cause is in someone else's home and the fix needs their cooperation. In Singapore there is an established framework for exactly this, and knowing it turns a standoff into a process.
The starting point: joint responsibility
For an inter-floor leak in an HDB flat, the law treats the floor slab between the two flats as a party structure — shared between the upper and lower units. The default is that the upper and lower flat owners are jointly responsible for repairing it, with the cost shared 50-50. This holds regardless of whose flat the water appears in, because the slab belongs to both.
That default can shift if the leak is clearly caused by one party — for example, by a failed waterproofing membrane the upper owner damaged during their own renovation. But the sensible first assumption, and the one the process is built around, is shared responsibility.
What to do, in order
- Tell your upstairs neighbour. Many leaks are resolved neighbour-to-neighbour once the upper owner understands the water is coming from their floor.
- Inform HDB / your Town Council. They can assist in investigating the source and facilitating repairs.
- Use HDB's help with investigation. HDB can carry out tests to locate the source, which matters because guessing wrong means paying to open up the wrong floor.
- Mediation, then the tribunal. Where the neighbours cannot agree — on access, on cause, or on cost — HDB mediates. If that fails, the Community Disputes Resolution Tribunal has jurisdiction over disputes between neighbours.
The help that exists: Goodwill Repair Assistance
HDB offers a Goodwill Repair Assistance (GRA) scheme for eligible inter-floor leak cases, under which HDB co-pays 50% of the repair cost and the upper and lower flat owners share the remaining 50% between them. In effect, each owner may end up paying a quarter of the cost of a repair that neither caused and both suffer from — which is far easier to accept than the full 50-50 standoff.
How renovation connects to this
Many inter-floor leaks trace back to failed waterproofing in a wet area — which is a renovation decision. This is why a careful renovation treats bathroom waterproofing as a specification to get right, not a line to trim: proper membrane, proper upturns at the walls, proper falls to the drain, and a water test before anything is tiled over. The cost of doing it well is small against the cost — financial and neighbourly — of a leak into the flat below two years later.
If you are the one with the leak and renovation is involved, keep records: photos, dates, what was done and by whom. A clear record is what turns a he-said-she-said into a resolvable claim.
Sources
Figures in this article were checked in October 2026 against the pages below. Schemes, rules and rates change — please confirm the current position before relying on them.
This is general information about renovating in Singapore, not legal advice. GoDesign is not a law firm. For a dispute or anything turning on your specific circumstances, consult a qualified practitioner.