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A. Huber Putz- & Reinigungsunternehmen
5(1)
Haldenrain 75630 Muri AG
Clogged Downpipe? Causes, Costs & Cleaning Tips
October 6, 2026
4 minutes
Is water leaking from the side of the downpipe or is the gutter overflowing? These are sure signs of a blockage. Autumn leaves or bird nests are often the cause. If you don't act now, you risk water damage to the facade or a burst pipe. As of 2026, we will show you how to clean the downpipe, what costs you can expect, and who is responsible for it.
Key facts at a glance
The most important facts about clogged downpipes at a glance:
- Common causes
- Fallen leaves, branches, dirt, or abandoned bird nests often block the water drainage.
- Potential damage
- A backwater can lead to expensive moisture damage to the facade or cause the pipe to burst.
- Costs in Switzerland
- Prices are usually calculated per linear metre. As a rule of thumb, professional cleaning costs 6.50 to 8.00 CHF.
- Responsibility
- For rental properties, the landlord is generally responsible for maintaining the roof drainage system.
- Safety first
- Working on a ladder carries a high risk of falling. If in doubt, you should hire a tinsmith or roofer.
Regular checks in autumn prevent most problems.
Important terms related to roof drainage
Downpipe (drainpipe)
The vertical pipe that directs rainwater from the gutter down into the sewage system or soakaway.
Plumber's snake (drain auger)
A flexible, long wire tool inserted into pipes to mechanically break through stubborn blockages.
Tinsmith (Spengler)
A skilled tradesperson in Switzerland responsible for, among other things, sheet metal work on the roof and the installation of roof drainage systems.
These technical terms will help you communicate with tradespeople.
Cleaning methods compared
Water flushing
Best suited for
Light dirt and loose leaves without a solid plug.
Costs / time required
Very low, usually takes only 15 to 30 minutes.
Risks / disadvantages
Ineffective for stubborn blockages; requires a water connection within reach.
Who should do it
DIY enthusiasts (provided the inlet can be safely reached from the ground or a stable ladder).
Plumber's snake
Best suited for
More solid plugs of leaves or dirt deep in the pipe.
Costs / time required
Medium, a good manual snake costs approx. 20 to 50 CHF.
Risks / disadvantages
Can scratch and damage pipes made of soft materials like zinc or copper.
Who should do it
Experienced DIY enthusiasts or professional tinsmiths.
High-pressure cleaner
Best suited for
Very stubborn blockages and for thorough internal cleaning.
Costs / time required
High, if a device with a special pipe cleaning hose needs to be rented or bought.
Risks / disadvantages
Excessive pressure (over 150 bar) can burst the pipe or the plug connections.
Who should do it
Specialist companies (roofers or tinsmiths).
Step-by-step: Cleaning the downpipe safely
If you want to clean the downpipe yourself, a systematic approach is important. Attention: Only do the work yourself if you can reach the area safely.
1
Ensure safety
Place a stable ladder on an even, solid surface. Wear non-slip shoes and work gloves. At great heights or if unsure, you must call a professional.
2
Check the inspection flap
Many downpipes have a cleaning flap in the lower section. Open it and remove visible dirt or leaves by hand.
3
Remove coarse dirt at the top
Clean the gutter inlet of leaves and branches so that new dirt does not immediately slide down.
4
Perform a flush test
Carefully run water into the pipe from above. Observe whether the blockage loosens or exactly where the water leaks out.
5
Use a snake or high pressure
For stubborn blockages, insert a plumber's snake or a high-pressure cleaning hose from above. Slowly work your way through the plug.
6
Final check
After cleaning, flush the pipe generously with water to ensure it is completely clear again.
Tip: After cleaning, install a leaf guard at the inlet to prevent future blockages.
Frequently asked questions about clogged downpipes
Here you will find answers to the most important questions regarding the cleaning and maintenance of downpipes.
Prices are usually calculated based on the length of the gutter and the downpipe. In Switzerland, the costs for professional cleaning in 2026 are generally around 6.50 to 8.00 CHF per linear metre. Travel costs and flat rates for hopper heads are often added.
The maintenance of the roof drainage system is generally the landlord's responsibility (according to Art. 256 CO). Since cleaning often requires dangerous work at heights, it does not fall under the 'minor maintenance' that the tenant must handle themselves.
Yes, it is very effective with a special pipe cleaning hose. However, the pressure for household pipes should not exceed 100 to 150 bar, otherwise the pipes or connections could be damaged.
A downpipe protector (leaf guard or grating) at the inlet prevents coarse dirt from entering the pipe. In addition, you should have the gutter checked and cleaned at least once a year – ideally in late autumn after the leaves have fallen.
Do you have any further questions? A local tinsmith or roofer will be happy to advise you.
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