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Home Blocked Drains
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Blocked drain?
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Common causes

What causes a blocked drain?

Fat, grease & food waste

The most common cause of kitchen sink blockages. Cooking fat cools and solidifies on pipe walls, narrowing the pipe over time until flow is restricted or stopped entirely.

Tree roots

Tree and shrub roots seek out moisture and can infiltrate hairline cracks in older clay or concrete drain pipes. Once inside, roots grow rapidly and cause major obstructions.

Hair, wipes & foreign objects

Hair accumulates in bathroom drains and showers; wet wipes and nappies flushed down toilets are a leading cause of sewer blockages. Even “flushable” wipes do not dissolve properly.

Collapsed or damaged pipes

Older clay and concrete pipes can crack, collapse or become misaligned. Ground movement, frost, and heavy vehicle loads are common causes. A collapsed pipe requires repair, not just jetting.

Mineral & scale build-up

In hard water areas like London and the South East, limescale deposits coat the inside of pipes over time, reducing their diameter and trapping other debris, leading to progressive blockages.

Soakaway & drainage failure

Soakaways have a limited lifespan and eventually become saturated or collapse. A failing soakaway causes water to back up into the drainage system, flooding gardens and drives.

Warning signs of a blocked drain in a British home

Signs you have a blocked drain

Caught early, most blockages can be cleared quickly and cheaply. Left too long, they can cause structural damage costing thousands of pounds. Know what to look for.

  • Water draining slowly from sinks, baths or showers
  • Gurgling or bubbling sounds from plugs or toilets
  • Unpleasant sewage or rotten egg smell from drains
  • Water or sewage backing up into sinks, baths or toilets
  • Raised water level in outside inspection chambers
  • Damp patches on walls or floors near drains
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Simple process

How it works

1
Enter your postcode

We check whether we have a vetted engineer available in your area right now.

2
Leave your details

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3
Engineer calls you back

A local vetted engineer calls you directly — typically within minutes — with a free no-obligation quote.

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Local engineers near you

Common questions

Blocked drain FAQs

Most engineers on our network offer same-day appointments. After submitting your request you will typically receive a callback within 10 minutes, and many engineers can attend within a few hours.
The most common causes are fat and grease in kitchen drains, hair and soap in bathroom drains, tree root ingress in outdoor pipes, and foreign objects flushed down toilets. Collapsed or misaligned pipes can also cause persistent blockages.
Minor blockages can sometimes be cleared with a plunger or chemical unblocker. However, if the blockage persists after 24 hours, is recurring, or is accompanied by gurgling sounds or bad smells, a professional engineer with jetting equipment is needed.
A standard clearance typically costs between £75 and £200 depending on blockage type and location. The engineer will quote you a fixed price before starting any work. Using Blocked Drain Quotes to find an engineer is completely free.
A recurring blockage suggests an underlying problem. A CCTV drain survey will identify whether you have a structural defect, root ingress, or collapsed section so the root cause can be fixed permanently.

Drain blocked? Don’t wait.

A local engineer will call you back within minutes — free, no obligation, no call-out charge to quote.

Get a free callback now Call 0800 123 4567