Why bathroom floor water ponding happens
Water collects on the bathroom floor instead of draining when it cannot get into the drain fast enough, or when it cannot reach the drain at all. The first is a flow problem you can often fix yourself. The second is the shape of the floor.
As practical advice, these are the usual causes:
- A slow floor trap. Hair, soap scum and sand build up under the grating and slow the water down.
- A choked branch pipe. The trap looks clear, but the pipe beyond it is partly blocked, so water backs up.
- A low spot. Poor floor slope or popped tiles leave a dip where water sits away from the trap.
- A shower screen kerb. The kerb or its seal holds water on one side and keeps it from running to the drain.
HDB's floor traps guide says floor trap overflow is caused by solid particles or grease choking the floor trap or pipe, and asks you to keep the floor trap grating closed. Its floor finishes guide adds that popping tiles are caused by thermal movement and water absorption.
Clear the floor trap
A floor trap slow to drain is usually holding hair and soap just below the grating. Clear it first, before you call anyone.
- Lift the grating. Pull the grating off the floor trap. Wear rubber gloves, as the trap will be dirty.
- Remove hair and debris. Pick out hair, soap scum, sand and any small items from the trap and grating.
- Flush water. Pour a pail of water into the trap and watch how quickly it goes down.
- Refit the grating. Put the grating back so it sits flat and closed over the trap.
HDB's floor traps guide gives similar steps for a smelly floor trap: remove particles and flush water into the trap. It also asks you to keep the floor trap grating closed, so do not leave it off.
If the water now runs away quickly, the trap was the cause. If you still have water not draining from the bathroom floor, the blockage is likely further down. See the guide on a shower drain choke.
If the drain is choked
A bathroom floor not draining after you have cleared the trap usually has a choke deeper in the trap or in the branch pipe. This is the point to call a plumber.
FROM THE HOMEZYPRO DIRECTORY
Published choke clearing rates
For the most common unit (per job), the lowest published choke clearing rates from 22 companies run from S$50 to S$150 per job (middle rate S$80), to clear one choke in a toilet bowl, floor trap or sink. The middle figure is a real published rate, not an average. Each figure is one company's own advertised rate with its conditions, not a quote.
See 22 published choke clearing rates and sources
| Company | Service as listed | Rate | Source |
|---|---|---|---|
| Kiasu Plumber | Remove kitchen sink choke | From S$50 per job | kiasuplumber.com |
| SG1 Plumber Singapore | Floor-trap Choke Cleaning | S$50 per job | sg1plumber.com |
| AquaHero Plumbing | Clear Clogged Floor Trap | S$60 per job | aquahero-plumbing.sg |
| EZ Plumber SG | Clear Clogged Floor Trap | S$60 per job | ezplumber.sg |
| Plumber - Singapore Plumbing 24hrs | Supply Labour to Clear Toilet Bowl Choke | From S$60 per job | singaporeplumbing24hrs.com.sg |
| Sin Plumbing Singapore | Clear clogged floor trap | From S$60 per job | sinplumbing.com |
| Uncle Plumber | Clear clogged floor trap | From S$60 per job | uncleplumber.sg |
| GD Plumbing | Clogged toilet bowl / Clearing toilet bowl choke | From S$70 per job | gdplumbing.com.sg |
| Hdbplumber Service SG | Clearing toilet bowl choke | From S$79 per job | hdbplumberservice.com.sg |
| Ace Plumbing Specialist | Clogged toilet bowl / clearing toilet bowl choke | From S$80 per job | aceplumbing.sg |
| Active Plumbing Singapore | Clearing toilet bowl choke | From S$80 per job | activeplumbing.sg |
| Home Plumbers Singapore | Clear a toilet bowl choke | From S$80 per job | homeplumbers.com.sg |
| PlumbersGuru Singapore | Basic unclogging starts . Complex jobs with grease traps or root intrusion cost more. We | From S$80 to S$150 per job | plumbersguru.com |
| PW Plumbing Services | Toilet Choke Clearing | S$90 to S$150 per job | pwplumbing.com.sg |
| SR Power Plumber Pte. Ltd. | Clearing toilet bowl choke / clogged toilet bowl | From S$90 per job | srpowerplumber.com |
| Huat Plumbing | Toilet Bowl Choke Clearing | From S$100 per job | huatplumbing.sg |
| Prima Technologies Pte. Ltd. (Prima Services) | Toilet Bowl Choke Clearing | From S$100 per job | primaservices.sg |
| Sk Plumber | Toilet bowl choke clearing | From S$115 per job | sksplumber.com |
| Best Plumbing | Clogged toilet bowl / Clearing toilet bowl choke | From S$120 per job | bestplumbing.com.sg |
| Summer Plumbing Service | Clogged toilet bowl / Clearing toilet bowl choke | From S$120 per job | sgplumbing.com.sg |
| NILE Plumbing | Clear Choke (Sink/Basin) | From S$150 per job | nileplumbingsg.com |
| Siam Engineering Pte Ltd | Choke Clearing & Drainage | S$150 per job | siamengineeringsg.com |
22 companies publish a choke clearing line, and all 22 price it per job. Their published rates run from S$50 to S$150 per job, as printed. The two middle rates are both S$80 per job, so S$80 is a real published rate rather than a calculated figure. Lines that name the floor trap itself are printed at S$50 per job and S$60 per job, some with "From" in front.
The scope as printed is clearing one choke in a toilet bowl, floor trap or sink, so each price covers one choke. If both the floor trap and the toilet bowl are choked, ask whether that counts as two jobs. Where a line starts with "From", ask what would raise the final price. See also the floor trap choke cost guide.
Fixing the floor slope
If the trap and pipe run freely but water still stands in the same spot, the floor itself is the problem. Tiles that dip, or that fall away from the trap, leave water with nowhere to go. A squeegee helps from day to day, but the lasting fix is to change the slope.
As practical advice, a tiler can re-lay the affected area so that it falls towards the floor trap. In an HDB flat, HDB's renovation guidelines for building works say:
- Replacing floor finishes needs a permit.
- In bathrooms, a waterproofing screed and membrane go in before the new finishes, with the membrane turned up at least 150mm.
- In new flats, bathroom finishes may not be removed in the first 3 years. After that, a permit is needed.
- An overlay of new tiles with adhesive needs no permit if there is only one existing layer of finishes, the new layer is 13mm or less, the floor trap is not tampered with and there is no backflow of water.
Ask your contractor whether the work they propose needs a permit. More detail is in the guide to HDB floor tile rules.
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Compare plumbersPonding and leaks
Daily ponding keeps the bathroom damp. HDB's floor finishes guide advises you to avoid dampness, dry the surface after mopping and ventilate rooms.
As practical advice, check the ceiling of the unit below if ponding has gone on for a while. Stains, damp patches or drips there suggest water is getting through the floor, and that needs a waterproofing check rather than another round of drain clearing. A plumber deals with chokes and pipes, while a waterproofing contractor deals with the membrane under the tiles. To decide who to call, compare a plumber or waterproofing specialist.
Questions
Is some water on the bathroom floor normal after a shower?
Yes, a thin film of water is normal after a shower. It should run to the floor trap and clear within a few minutes. Pools that are still standing long after you finish are not normal, and usually point to a slow trap, a choked pipe or a low spot in the floor.
Can I fix the floor slope without re-tiling?
Not really, but you may not need to redo the whole floor. A tiler can re-lay just the low area so it falls towards the floor trap. HDB's building works guidelines say an overlay of new tiles with adhesive needs no permit if its conditions are met, including that the floor trap is not tampered with and there is no backflow of water.
Does a bigger floor trap grating help?
Not on its own: a clean grating and a clear trap matter more than size. Remove hair and soap from the grating regularly and keep it closed, as HDB's floor traps guide asks. Do not tamper with the floor trap itself. HDB's building works guidelines list a floor trap that is not tampered with as one condition for a tile overlay without a permit.
Why does water pool near the shower screen?
Because the screen's kerb or seal is holding water back on one side. If the kerb sits between the shower area and the floor trap, water collects against it instead of draining. A worn or badly fitted seal can do the same. Ask your contractor whether the kerb or seal can be adjusted so water runs towards a drain.
Can standing water damage the waterproofing?
It can, if ponding goes on for long enough. Water that sits on the floor day after day can find gaps in grout, sealant or the waterproofing below and reach the unit underneath. Check the ceiling below for stains or damp patches, and if you see any, have the waterproofing checked.
How do I dry a bathroom floor faster?
Squeegee standing water towards the floor trap, then ventilate the room. HDB's floor finishes guide suggests avoiding dampness, drying the surface after mopping and ventilating rooms. Open the window or run the exhaust fan after a shower, and keep the grating clear of hair.
Prices come only from the sourced company rates in the HomezyPro directory, shown with each company and its source.
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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