London’s tree-lined streets look great in autumn, but leaves, twigs and moss end up in gullies, downpipes and gutters. Add heavy autumn rain and the cooking fat many of us pour away without thinking, and outside drains block more in October and November than at almost any other time.
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Know your outside drains
- Gullies: the grated drains at ground level, often below a kitchen waste pipe or downpipe
- Rainwater downpipes: carrying water from gutters to the ground
- Inspection chambers: the square or round covers you can lift to see the drain below
Signs an outside drain is blocking
- Water pooling around a gully or over the grate
- Gurgling from sinks and baths
- A bad smell near drains outside
- Water backing up into an inspection chamber
- Slow-draining sinks and showers indoors
Simple autumn maintenance
- Lift gully grates and scoop out leaves and debris (wear gloves)
- Fit gully covers or leaf guards
- Clear gutters so leaves are not washed into downpipes
- Never pour fat, oil or grease down the sink, even with hot water
- Use sink strainers to catch food scraps
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What not to do
Avoid putting caustic chemicals down outside drains in large amounts, and never try to force a blockage with makeshift rods if water is backing up towards the house. Also avoid lifting heavy or shared inspection covers if you are unsure, as they can be dangerous.
When to call a plumber
Call us if water will not drain away after you have cleared the grate, if more than one fixture is affected, if waste water is backing up, or if there is a smell of sewage. Drain rods, jetting and camera surveys can clear and diagnose most blockages quickly.
Frequently asked questions
Why do outside drains smell in autumn?
Rotting leaves and trapped food waste in gullies are common causes.
Can tree roots block drains?
Yes. Roots can enter older clay drains through joints and cause recurring blockages.
Is it my job to clear the street drain?
No. Road gullies are the council’s responsibility. Report blocked ones to your council.
