Drains and smells
What causes a floor trap smell?
Trapped solid bits and grease are the usual cause. HDB's floor trap guide says to deal with smells by removing the particles and flushing water into the trap. Lift the grating, pick out hair, pour a pail of water through and close the grating again.
Why does water pool around the trap?
A partly choked trap or pipe. HDB says overflow happens when solid particles or grease choke the floor trap or its pipe, and that serious chokes need a licensed contractor. If water still sits on the floor after you clear the grating, call for help.
How do I stop grease choking the pipes?
Keep cooking oil out of the kitchen sink, because HDB notes that oil solidifies and chokes the pipe. It also suggests pouring degreaser into the sink discharge pipes regularly. For a smell that lingers anyway, see our bathroom drain smell guide.
Toilets and cisterns
HDB's toilets guide gives these first fixes.
| Fault | First fix |
|---|---|
| Cistern overflows or fills slowly | Adjust the water level screw, or replace a damaged ball float or worn washer |
| Toilet flushes slowly | Place a plunger over the waste hole and pump vigorously |
Why does the cistern keep running?
This toilet cistern problem usually comes down to a part that has drifted or worn. HDB points to the water level screw, the ball float and the washer. Turn off the cistern's supply valve before lifting the lid. Our toilet keeps running guide shows each step.
When should I stop plunging?
After a few firm pumps with no change. HDB says a slow-flowing toilet has a partial blockage in the sanitary pipe that usually clears after a few vigorous pumps. If it does not, engage a licensed plumber rather than pouring in chemicals.
How often should the toilet be cleaned?
Daily, going by HDB's guide. It suggests cleaning the toilet every day with diluted household bleach and disinfecting the pedestal with a household disinfectant. Follow the dilution on the bottle, rinse the bowl well and leave the door open afterwards so fumes clear.
Leaks and ceilings
Why is my bathroom ceiling dripping?
Water from the flat above is getting through the floor slab. HDB explains that this happens when the waterproof membrane and screed wear over time, and says it is common in older buildings, usually in toilets and bathrooms. A stain that spreads after upstairs showers is a strong hint.
Who arranges the repair?
You and your upstairs neighbour do. HDB says flat owners are responsible for the upkeep of their own flats, including the floor and ceiling slabs. When a slab needs repair to resolve the leak, you and your neighbours arrange the work and split the costs. Photos of the stain help.
Can a small leak wait?
Not for long. HDB warns that untreated leaks may damage electrical items and cause mould growth. If the water seems to come from a shared pipe or a common area rather than the flat above, ask your Town Council to check. Our ceiling leak from upstairs guide covers tracing the source.
Mould and slippery floors
Why does mould keep coming back?
Because the room rarely dries out. Shower steam, plus any slow leak from upstairs, keeps grout and ceiling paint damp. Run the exhaust fan or open the window after each shower and squeegee the walls. Our guide to remove bathroom mould covers stained grout and ceilings.
Why do wet tiles matter for older parents?
Because home is where falls often happen. HealthHub says most falls among older people happen at home, and that the majority occur due to clutter or hazards such as slippery floors or loose cords. A wet bathroom floor is exactly that kind of hazard.
How can I make the floor less slippery?
Deal with the surface, the light and the footwear. HealthHub's list of fall risks includes slippery surfaces, unsecured rugs, inadequate lighting and wrong footwear. Swap loose mats for rubber-backed ones, make sure the shower area is well lit and keep non-slip slippers at the door.
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Compare plumbersUpgrades for HDB bathroom problems
What is the HIP toilet package?
It is an Optional Improvement: a package to upgrade existing toilets or bathrooms. HDB says you pay only your share of the items you choose, and the block must first vote in favour of HIP. Works take 10 working days or less per flat, depending on the improvements chosen. See our HDB HIP guide for more.
What if I opt out of it?
Your toilets must then pass a water test for leaks, which HDB says is to prevent ceiling leaks in the flat below. For older residents, HIP's Enhancement for Active Seniors (EASE) items include grab bars, a wall-mounted foldable shower seat, a lowered toilet or bathroom kerb and slip-resistant treatment for existing floors.
Where to go next
If damp is creeping into a bedroom wall, or you and your neighbour disagree on the source, the leaks and seepage FAQ picks up from here. Beyond a first fix, quotes depend on the job, so ask each plumber to see the problem and name the cause before agreeing to a repair. The plumbing directory lists companies with their published prices.
Questions
Who pays to fix a leak into the flat below?
The owners of the two flats share it. HDB says flat owners are responsible for the upkeep of their own flats, including the floor and ceiling slabs, so when a slab must be repaired to stop the leak, you and your neighbours arrange the work and split the costs.
Can I fix a running cistern myself?
Often, yes. HDB's toilets guide describes adjusting the water level screw and replacing a damaged ball float or worn washer, which many households manage with basic tools. If your flushing system differs from HDB's illustrations, for example a concealed cistern behind a wall panel, call a plumber instead.
Why does my bathroom smell after rain?
The floor trap is the first place to look. Smells from trapped debris can become more noticeable in damp weather, so clear the grating and flush water into the trap, as HDB suggests for smells. If it keeps returning, ask a licensed plumber to check the trap and pipe.
Does the Town Council fix bathroom leaks?
Not usually for a leak between two flats. HDB says owners are responsible for their own flats, including the floor and ceiling slabs, so you and your upstairs neighbour arrange and share slab repairs yourselves. If water seems to come from a shared pipe or a common area instead, report it to your Town Council.
Can a handyman clear a choked toilet?
For a simple choke, yes: plunging is the first fix HDB gives homeowners. PUB says regulated water service and sanitary plumbing works must be done by PUB Licensed Plumbers, apart from the simple plumbing works handymen may do, and since 2018 it has been an offence to engage a plumber not licensed by PUB for regulated works. If plunging fails, call a licensed plumber.
How do I stop grout from turning black?
Keep it dry between showers. Black grout is usually mould, and mould needs moisture, so squeegee the tiles, run the exhaust fan or open the window, and fix any leak from upstairs early. Scrub the lines weekly with a mild bathroom cleaner and an old toothbrush, and the mould guide above covers stubborn stains.
Practical guidance for planning a home job in Singapore. Company prices come from the HomezyPro directory, each linked to its source; rules and safety points link to the agency or manufacturer that sets them. This is not a site inspection, a quote or professional advice for your home.
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