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Blocked Drains in London — Your Local Drain Expert Sorts It Today

A blocked drain does not wait for a convenient time. A sink full of standing water, a toilet backing up into the bowl, a bath that drains so slowly you end up standing in six inches of dirty water. These things need sorting now, not at the end of someone’s diary.

Your local drain specialist from 247 Plumber London carries everything needed to clear blockages at any level of your drainage system. From the simple kitchen sink blockage to the collapsed section of clay drain buried three metres down, we have dealt with it in London properties and we know what to expect.

What Causes Blocked Drains in London

Blocked Kitchen Sink

The kitchen sink is the most commonly blocked drain in any London home. Cooking grease is the primary culprit. When you wash up after cooking, melted fat goes down the drain as a liquid. It cools in the pipe and sticks to the walls. Over months and years, layers build up until the pipe is narrowed enough that even washing up water barely drains. Food particles, coffee grounds and tea leaves add to the problem.

The first thing most people do is pour boiling water and washing up liquid down the drain. This works for minor grease blockages but rarely touches a full one. The next step is a plunger, which can dislodge a soft blockage in the trap under the sink. The P trap, the U shaped section of pipe below the sink, is where most kitchen sink blockages actually live. Unscrewing the trap and cleaning it manually is the most effective first step and it costs nothing if you feel comfortable doing it yourself.

If the blockage is further down the pipe, beyond the trap and into the soil stack or the underground drain, you need professional equipment. We use professional drain rods and high pressure jetting to clear blockages at any point in the system.

Blocked Bath or Shower

Hair is the main cause of blocked baths and showers. A shower drain that starts taking thirty seconds to clear becomes one that takes five minutes, then ten, then it is completely solid. Hair combines with soap scum and shampoo residue to form dense plugs that sit just below the drain cover or in the first bend of the waste pipe.

A wire hook or a standard drain clearing tool can often pull a hair blockage out yourself. Reach into the drain past the cover and feel for the plug. Pull it out in one go. It will not be pleasant but it works. If the blockage is further down, or if the waste pipe to the bath is partially collapsed from decades of movement in old timber floors, it needs professional attention.

Baths in Victorian and Edwardian London properties often have their waste pipes running through inaccessible voids in timber floor structures. The pipe may have partially collapsed or delaminated from the inside over decades. A CCTV drain survey is the only way to see what is happening in these situations.

Blocked Toilet

Despite what packaging claims, wet wipes do not break down in drains. Sanitary products, cotton wool, cotton buds and baby wipes are also commonly flushed and none of them belong in a toilet. These items collect on any rough spot in the soil pipe or at any change in direction and build up over time into a solid mass.

London flats on upper floors of converted Victorian houses often have soil pipes that have been rerouted several times as the building was converted. Joints that were not made cleanly, changes of direction at odd angles, and sections of pipe with internal scale buildup are all common. A toilet that blocks repeatedly in the same property despite normal use almost always has a drainage issue that a CCTV survey will confirm.

A plunger with a flange, not just a cup plunger, is the right tool for a blocked toilet. Push down firmly and pull up sharply in quick succession. If the blockage does not clear with ten or fifteen attempts, call us. We use professional drain rods with cutting heads and jetting equipment that clears even the most compacted blockages without damaging the toilet or the pipework.

Blocked Outside Drains and Gullies

The gully at the corner of your house where the kitchen waste and rainwater runs out is often neglected until it overflows. Leaves, moss, food waste from kitchen pipes and general debris builds up in the gulley trap over the autumn and winter. When it overflows, water backs up and can cause damp issues at the base of external walls. Clearing a gulley yourself is straightforward. Lift the cover, remove the trap and scoop out whatever has accumulated. Flush with a hose.

If the drain is backing up from further down the system, from the main underground drain that runs under the garden or under the public pavement, that is a different matter. Root ingress from trees growing near drains is a major problem across London, particularly in streets with mature plane trees and in gardens with large shrubs near drain runs. Tree roots can crack clay drain sections and grow inside the pipe, eventually blocking it completely. A CCTV drain survey shows exactly what is happening and where, so we know whether jetting will clear the blockage or whether a section of drain needs to be excavated and replaced.

CCTV Drain Survey

A CCTV drain survey uses a small camera on a flexible rod pushed through your drainage system to show us the inside of every pipe. We can see cracks, root ingress, collapsed sections, displaced joints, blockages in formation and the general condition of the drainage. The survey records to video and we provide you with a report and a copy of the footage.

If you are buying a property in London, a CCTV drain survey is one of the most valuable checks you can make before exchange. Drain repairs are expensive and the survey is comparatively cheap. We have seen buyers save tens of thousands of pounds because a survey identified a collapsed drain that would have been their responsibility from day one.

High Pressure Water Jetting

High pressure jetting sends a powerful stream of water at up to 4000 PSI through your drain, cutting through grease, scale and debris and washing everything to the main sewer. It is the most effective way to restore full flow to a partially or fully blocked drain and it also cleans the pipe walls, reducing the rate at which blockages reform.

Jetting is also used to cut through tree roots that have grown into the drain. The jet head spins as it travels through the pipe, cutting roots flush with the pipe wall. This does not prevent regrowth but clears the drain completely and often keeps it clear for two to three years before roots regrow to a problematic level.

Why London Drains Block More Often

London has some of the oldest drainage systems in the world. The main London sewer system was designed by Bazalgette in the 1860s and while it has been extended and upgraded many times, much of the infrastructure dates back well over a century. Individual property drains in Victorian and Edwardian housing are often original clay sections that have shifted, cracked and partially collapsed over a hundred years of ground movement and root ingress.

London’s hard water also contributes to drain problems. Limescale builds up on the inside of waste pipes from baths, sinks and showers, narrowing the bore gradually until flow is severely restricted. A drain that looks clear when you look down it from above can have significant internal scale buildup that is not visible without a camera. Jetting strips this scale and restores the original internal diameter.

Frequently Asked Questions

How much does drain unblocking cost in London?

Simple blockages cleared with rods or a hand machine typically cost between eighty and one hundred and fifty pounds. High pressure jetting is more depending on the length of drain and the severity. We will give you a fixed price before we start.

Can I use chemical drain cleaners?

Chemical drain cleaners work on minor grease blockages and slow drains but they rarely clear a full blockage and they can damage older pipework over time, particularly cast iron soil stacks and clay drain sections. They are also harmful if they come into contact with skin or eyes. For a full blockage, mechanical clearing is more effective and safer.

My drain keeps blocking in the same place. What is wrong?

A drain that blocks repeatedly usually has an underlying structural issue. A partial collapse, a displaced joint, an internal protrusion from a joint that was made incorrectly, or root ingress. A CCTV survey will show exactly what is causing the recurrence and we can then give you a proper long term fix rather than just clearing it again.

Do you do emergency drain unblocking at night?

Yes. We cover drain emergencies twenty four hours a day, seven days a week. A blocked toilet or a drain that is backing up into the property is a genuine emergency and we treat it as one.