Common Causes of Blocked Drains (and How to Prevent Them)

  July 01, 2026

Blocked drains are one of the most frequent plumbing issues faced by homeowners. Whether it’s a slow-draining sink, unpleasant smells, or water backing up unexpectedly, a blockage can quickly become a serious inconvenience.

At Ansell Plumbing, we regularly help customers across Tunbridge Wells, Tonbridge and Paddock Wood deal with drainage problems - and in many cases, the cause is something simple that has built up over time.

Here are some of the most common reasons drains become blocked, and what you can do to prevent it.

Grease and Food Waste in Kitchen Sinks

One of the leading causes of kitchen drain blockages is cooking fat and grease.

When hot oil is poured down the sink, it may seem harmless, but as it cools it solidifies inside the pipework. Over time, this builds up and traps food particles, eventually creating a stubborn blockage.

To reduce the risk:

• Avoid pouring oils or fats down the sink
• Wipe greasy pans with kitchen roll before washing
• Use sink strainers to catch food waste

Hair and Soap Build-Up in Bathrooms

Bathroom drains often become blocked due to a combination of hair, soap residue and toiletries.

Hair collects inside the pipe, while soap scum sticks to the sides, gradually narrowing the flow of water. This is especially common in showers and bath plugholes.

Regular cleaning and using simple drain guards can prevent this from becoming a larger issue.

Wet Wipes and Sanitary Products

Even products labelled f lushable can cause serious drainage problems.

Wet wipes, cotton buds and sanitary items do not break down like toilet paper. They can become lodged in pipework and lead to major blockages, sometimes affecting the entire household system.

The safest rule is simple: only flush toilet paper.

Tree Roots and Outdoor Drain Issues

In some properties around Kent, tree roots can grow into underground drainage pipes, especially if the pipes are older or have small cracks.

Roots seek moisture and can quickly create significant blockages or damage.

If you notice repeated drain problems or slow drainage outside, a professional inspection may be needed.

Signs You May Have a Blocked Drain

Early warning signs are important. Contact a plumber if you notice:

• Water draining slowly
• Gurgling noises from plugholes
• Bad smells from sinks or toilets
• Water backing up after flushing

Ignoring these signs can lead to more serious issues, including flooding or pipe damage.

Drainage Services from a Local Plumber

Ansell Plumbing provides professional drainage and plumbing support across Tunbridge Wells, Tonbridge and Paddock Wood.

Whether it’s a minor blockage or a more serious drainage issue, we can identify the cause and resolve the problem quickly and safely.

If you’re experiencing slow drains or repeated blockages, get in touch with Ansell Plumbing for friendly local advice and expert service.