Ceiling leaks and water seepage in a new HDB flat: what to check and who fixes it

A damp patch on the ceiling is one of the most stressful things to find in a new flat. The good news: in a new HDB flat, a leak found early is usually straightforward to get fixed. The key is to spot it before renovation covers it up, and to record it properly.

Where leaks show up first

• Bathroom and kitchen ceilings. These sit under the wet areas of the flat above, so they're where slab leaks usually appear.
• Around the ceiling access panel in the bathroom. Lift it if you can and look at the slab above with a torch.
• External walls, especially below windows, around aircon ledges and in corners facing the rain.
• Around pipes and floor traps, where pipes pass through the slab.

Signs to look for

• Water stains, brown or yellow rings, or a darker patch on the ceiling.
• Paint that is bubbling, blistering, peeling or flaking.
• Drips, or water collecting on the ceiling access panel.
• Mould or black spots, or a musty smell that doesn't go away when you air the room.
• Wall paint that feels damp or cold to the touch compared with the wall next to it.

A dry crack on its own is not the same as a leak. A crack with a stain, damp or bubbling paint around it is worth reporting straight away.

How to check at key collection

1. Bring a torch. Bathroom ceilings are often dim, and stains are easy to miss without one.
2. Look up in every wet area, slowly, corner to corner. Then check the external walls in each room, especially under windows.
3. Go back after heavy rain if you can. External wall seepage often only shows when it has rained for a while.
4. Visit again before renovation starts. Some leaks only appear once the flat above is occupied and their bathroom is in daily use.

Record it before you report it

• Put a strip of painter's tape next to the stain (not on the wet paint) and write a number on it, for example #12.
• Take a close-up photo and a wider photo that shows which room and which corner it's in.
• Note the date, and whether it had rained. If the stain grows, photograph it again from the same spot a few days later.
• Mark the spot on a floor plan, so the BSC and contractor can find it quickly, especially in flats where two bathrooms look alike.

During the defects liability period

For the first year after key collection, report leaks and seepage to HDB's Building Service Centre (BSC) for your project, either online or at the BSC office on site. The BSC arranges a joint inspection, investigates the source and gets its contractor to fix it. Report as early as you can, ideally in the first month and before your renovation contractor starts, so there's no question of the leak being caused by renovation work.

Don't paint over a stain, and don't let your contractor "fix" it by patching or waterproofing over it before HDB has seen it. Once it's covered, it's much harder to show it was there from the start.

After the first year

HDB provides longer warranties for some items beyond the one-year defects liability period. Commonly cited ones are 5 years for ceiling leaks in toilets and kitchens, 5 years for external wall seepage, and 10 years for spalling concrete. Check the warranty terms for your own flat on HDB's website, since conditions apply.

One condition matters a lot for renovation: HDB doesn't allow the bathroom floor tiles of a new flat to be hacked within the first 3 years, to protect the waterproofing layer. Changing the bathroom floor finish or tampering with the waterproofing can mean HDB is no longer responsible for leaks from that area. Overlaying tiles instead of hacking is a common way around this, but confirm with your contractor and HDB's renovation guidelines first.

Leaks from the flat above, later on

Once warranties no longer apply, the floor slab between two flats is treated as the joint responsibility of the upper and lower flat owners. For leaks caused by wear and tear, HDB's Goodwill Repair Assistance scheme co-pays 50% of the ceiling repair cost and the two owners split the rest equally. If the leak was caused by renovation work in the upper flat, that owner is responsible for the full repair. Leaks from inside your own flat, such as a pipe, window frame or aircon trunking, are your own to fix. External walls and the roof are common property, so contact your Town Council for those.

Quick checklist

• Torch on every wet-area ceiling and external wall at key collection.
• Lift the bathroom access panel and look at the slab.
• Tape, number and photograph every stain, with a wider shot for location.
• Re-check after heavy rain and before renovation starts.
• Report within the defects liability period, and don't paint over it.
• Keep all photos and reports. They're your evidence if the same spot leaks again.