Handle It Fairly · Fix It No-Hacking · 2-Year Warranty
Few messages create as much stress as your downstairs neighbour knocking on the door to say, "There's water dripping from my ceiling and it seems to be from your toilet." Whether you rent or own your HDB flat, this situation needs to be handled quickly, fairly, and correctly — because ignoring it makes everything worse: relationships, repair costs, and eventually, HDB or Town Council involvement. This guide walks you through exactly what to do, step by step.
The most important first move is simply to respond kindly and take the complaint seriously. Your neighbour is dealing with water in their home — that's stressful for them too. A polite, cooperative attitude at the start prevents the situation from escalating into a formal complaint. Ask if you can come and see the ceiling stain yourself, or ask them to send you a photo. This shows you're taking it seriously.
What not to do: don't dismiss the complaint, don't argue that "it can't be from us", and don't wait weeks to respond. In HDB flats, leaks from an upper unit's bathroom to the lower unit's ceiling are the most common cause — and if unresolved, HDB or the Town Council may eventually get involved, which makes the situation more formal and stressful for everyone.
Not every ceiling leak downstairs is from the unit directly above. Before assuming anything, do a simple check: stop using your toilet or bathroom for 24 hours (as much as reasonably possible). If the ceiling stain downstairs stops growing during that period, the leak almost certainly is from your unit. If it continues to spread, the source may be elsewhere — a common water pipe, a unit two floors up, or an external issue.
For a proper diagnosis, a waterproofing specialist can inspect both your bathroom and the neighbour's ceiling and confirm the source in minutes, saving days of back-and-forth guessing.
This is where most people get it wrong, so it's worth being precise. HDB's own position is that flat owners are responsible for maintaining the interior of their flats, and that the repair of leaks in the floor slab between flats is a joint responsibility between the upper- and lower-floor flat owners. It isn't automatically "the upstairs unit pays everything" — both households are expected to liaise with each other, investigate the cause, and get the repair done together.
To help resolve ceiling leaks caused by ordinary wear and tear, HDB offers the Goodwill Repair Assistance (GRA) scheme. Under the GRA, HDB co-pays 50% of the repair cost, and the remaining 50% is shared equally between the upper- and lower-floor flat owners — so each household pays roughly a quarter. It exists specifically to break the deadlock between neighbours and get leaks fixed quickly.
Two important limits to understand. First, the GRA covers leaks in the floor slab between flats caused by wear and tear — it does not cover damage to personal fixtures and fittings such as lighting, cabinets or shower screens, which owners settle privately between themselves. Second, if the leak is traced to something that isn't slab wear and tear — a leaking water supply pipe within one flat, for example, or damage caused by renovation works or negligence — then it falls outside the GRA, and that flat owner bears the repair.
Practical takeaway: don't assume you must bear 100% of the cost, and don't assume your neighbour must either. Report the leak to HDB, let them establish the cause, and if it qualifies as slab wear and tear, the GRA splits the burden fairly between HDB and both households. Acting early keeps the process simple and the relationship civil.
A trustworthy waterproofing contractor will inspect and diagnose the true source of the leak before quoting. Beware of anyone who gives a price over the phone without seeing the problem, or who immediately recommends hacking up all your tiles. A proper diagnosis takes 20–30 minutes and identifies whether the leak is from:
Once the source is confirmed, you get a clear picture of what needs fixing and what it will cost — before committing to anything.
The old assumption that fixing a downstairs leak means hacking up your entire bathroom is outdated. In most cases, modern no-hacking waterproofing methods can stop the leak in 1–2 days without removing a single tile:
Your bathroom stays intact, the work is clean and quiet, and — critically — your downstairs neighbour sees the leak stop within days, not weeks. That resolves the situation before it can escalate.
Once the waterproofing work is complete, ask your neighbour to monitor their ceiling for 1–2 weeks. It takes time for the wet ceiling to dry out, so the stain may still look damp for a while — but no new water should appear. Once they confirm the leak has stopped, the situation is resolved. It's good practice to keep a copy of the waterproofing invoice and warranty in case anything is queried later.
For a standard HDB toilet or bathroom, no-hacking waterproofing to stop a downstairs leak typically starts from $400, depending on the size of the area and the extent of the problem. Full hacking and re-tiling is far more expensive and rarely necessary. For a broader breakdown of all leak repair costs, see our water leak repair cost guide.
Not necessarily. HDB treats leaks in the floor slab between flats as a joint responsibility between the upper- and lower-floor owners. If the leak is due to ordinary wear and tear, the Goodwill Repair Assistance scheme has HDB co-paying 50% of the repair, with the remaining 50% split equally between both households. However, if the leak is traced to a cause outside that scope — a pipe within one flat, or damage from renovation works or negligence — that owner bears the cost. The best first move is always to report it, get the cause properly established, and cooperate early.
Ideally, both units are inspected to confirm the source clearly. If the downstairs neighbour won't allow access to see their ceiling, a specialist can still often diagnose the issue from your unit alone by testing the waterproofing and checking for signs of water escaping. If the dispute becomes serious, the Community Mediation Centre can help.
Most no-hacking waterproofing jobs are completed in 1–2 days. The stain downstairs may take an additional 1–2 weeks to fully dry out, but no new water should appear once the fix is done.
In the majority of HDB toilet leak cases, yes. Overlay membrane and injection methods are highly effective when applied correctly. In rare cases where the waterproofing has failed extensively, traditional hacking may be recommended — a proper inspection tells you which applies. An honest contractor will only recommend hacking when it's genuinely needed.
Yes — our bathroom waterproofing work comes with a 2-year written warranty. If the treated area leaks within that period, we return and fix it free of charge. This protects both you and your downstairs neighbour.
If you rent, notify your landlord immediately — the landlord (as the owner) is usually the party responsible for arranging and paying for the waterproofing repair. Don't ignore the neighbour's complaint just because you don't own the flat; the situation still needs to be handled promptly.
A toilet leaking to a downstairs HDB neighbour is stressful, but it is one of the most common and most fixable problems in Singapore housing. The winning approach: respond kindly and quickly, get a proper diagnosis, use no-hacking waterproofing to stop the leak in 1–2 days, and give your neighbour reassurance backed by a written warranty. Handled this way, the whole matter can be resolved within a week — with your bathroom intact, your neighbour satisfied, and your peace of mind restored. If you're facing this situation right now, a free inspection is the fastest first step to knowing exactly what you're dealing with.
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