Most blocked toilets in London clear with a plunger and a bucket of hot water. If they do not, the fault is usually in the drain run, not the toilet. This is common in Victorian terraces, where one shared run drains the toilet, bath and basin. That needs a drain engineer, not a plumber. If you would rather hand it over, see our toilet unblocking across London service.
A blocked toilet is unpleasant, and most London households will face one. The bowl may drain slowly, flush weakly or fill to the brim. Quick, safe action can stop a small problem becoming a flood.
Common Causes of Blocked Toilets in London
Items that should not be flushed. Wet wipes, cotton buds, sanitary products, nappies and dental floss are the usual culprits. They do not break down like toilet paper, so they catch in bends and narrow sections.
Too much toilet paper. Even paper can block a pan if you flush a lot at once. It can also block when the drain has a partial obstruction further down.
Limescale. London has hard water, so scale builds up inside the pan and the U-bend. Because it narrows the pipe, blockages become more likely.
A fault in the drain run. Sometimes the toilet is fine, but a blockage further along the shared run makes it drain slowly. This is common in Victorian terraces, since the toilet, bath and sink often use one run.
Old toilets. Some older toilets use too little water to clear waste. They can block even when used with care, although the fix is a better toilet.
Immediate Steps: What To Do
Step 1: Stop flushing. If the bowl is filling and not draining, do not flush again. It can overflow, and the water will flood the room.
Step 2: Try a plunger. Use a cup plunger, not the flat sink type. Press it firmly over the outlet and pump several times. While you work, keep old towels around the toilet.
Step 3: Try hot water. Pour a bucket of hot water into the bowl from waist height. Do not use boiling water, because it can crack the ceramic.
Step 4: Try washing-up liquid. Squirt a good amount into the bowl and leave it for 15 minutes. Then add a bucket of hot water. The soap helps the blockage slide through, since it makes it slippery.
Step 5: Call a professional. If these steps fail, or you think the fault is in the shared run, call a blocked toilet service. Do not force it with a coat hanger, because that can scratch the pan or harm the pipes.
When Is It an Emergency?
Because a full blockage can flood fast, contact our blocked toilet service at once if.
- The toilet is overflowing or about to overflow
- Sewage is coming up through another outlet, such as the bath, shower, basin or a floor gully, since that points to a full blockage in the shared run
- A bad smell comes from the drains, because sewage may be backing up in the pipes
- You live in a flat with one toilet and it is fully blocked
Preventing Blocked Toilets in London
Follow the "three Ps" rule, since it prevents most blocks. Only flush paper, pee and poo. Wipes, cotton products and sanitary items go in the bin, so keep a small covered bin next to every toilet.
In hard water areas, use a limescale remover now and then. While it takes little time, it keeps the pan and waste pipe clear of scale. If your home has old plumbing and repeat blockages, an inspection of the drain run can find the cause, such as roots or a collapsed section.
Frequently Asked Questions
Why does my toilet keep blocking even after it's cleared?
A repeat blockage almost always means a fault in the drain run. Roots may be narrowing the pipe, a joint may catch debris, or a section may lack the right fall, yet the toilet itself is fine. A CCTV drain survey finds the cause.
Can I use a wire coat hanger to clear a toilet blockage?
It is best not to. A hanger can scratch the porcelain, and rough patches trap debris later. A closet auger is the right tool if a plunger fails. If that fails too, call a professional, because forcing a blockage can push it deeper.
Why is sewage coming up through my bath when my toilet blocks?
Sewage from several outlets at once means the shared drain run is fully blocked. This is a drain emergency. Do not flush anything, and call a drain unblocking service at once. If the blockage may be in the public sewer, report it to Thames Water too.
How long does professional toilet unblocking take in London?
A simple blockage is quick to clear. However, if the drain run needs jetting instead of rodding, the job takes longer. Request a quote online and we confirm the price before any work starts.
Does home insurance cover a blocked toilet in London?
Some policies include drain or underground services cover. It may pay for unblocking when the fault is in your private pipes. Check your policy documents. Most insurers ask for a written report from the drain company.
Because every property is different, start with our guides to blocked toilets and sewage emergency advice. We also cover blocked toilets in Battersea and blocked toilets in Beckenham, so you can see how the work runs near you.
