The Most Common Causes of Blocked Drains and How to Prevent Them

Everyday habits in kitchens and bathrooms can make a real difference to how well drains flow. Keeping food, grease, hair and wipes out of pipework is a useful starting point.

Kitchen: keep food and grease out

Scrape leftovers into a food-waste container before washing dishes. A sink strainer can catch small pieces of food that would otherwise enter the waste pipe.

Cooking oil, fat and grease can cling to pipework as they cool. Let fat cool, then dispose of it appropriately rather than pouring it down the sink. Sending it away with boiling water does not guarantee that it will leave the drainage system.

Bathroom: catch hair before it reaches the waste

Hair can become trapped around the plughole or in the waste, particularly when combined with soap residue. Fit a suitable hair catcher to the bath or shower and empty it regularly. Clean visible, accessible deposits without dismantling fittings you are unsure about.

Toilet: flush only what belongs there

Wet wipes, cotton pads and sanitary products can catch inside pipework even when packaging suggests they are flushable. Keep a small bathroom bin available and avoid flushing these items.

Outside: pay attention to gullies

Remove leaves and litter from accessible drain grates, especially in autumn. Do not attempt to access underground pipework or enter a chamber without appropriate training and equipment. If an external drain backs up repeatedly, a professional survey may be needed.

What about home remedies?

Baking soda and vinegar are often presented as routine drain maintenance, but they are not a dependable way to remove a substantial blockage. Chemical drain cleaners can present risks and should never be mixed with other products. If one has been used, tell the person attending before any further work.

Signs it's time to investigate

Repeated slow drainage, gurgling across multiple fixtures, wastewater returning or persistent smells warrant attention. The problem may be in a trap, a shared waste line or further underground; the cause cannot be confirmed from symptoms alone.

For the wider range of causes, read seven common causes of blocked drains. If the problem persists, our drainage service can help arrange appropriate assessment.