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Water damage due to groundwater and flooding in the basement – a practical example

Flood protection for basement windows in private homes with flood bulkhead and tilt hatch

Initial situation: Water ingress during heavy rainfall

In September 2024, massive water damage occurred in the basement of a detached house.
Due to persistent heavy rainfall in combination with an elevated groundwater level, water entered the building unhindered through a basement window.

Within a short space of time, the cellar was under water. Furniture, building services and stored items were damaged.

The damage to property amounted to around 120,000 euros.

Cause: Rising groundwater level and increasing storms

Heavy rainfall events are becoming increasingly frequent:

  • the soil is saturated

  • the groundwater rises

  • Water penetrates not only above ground, but also laterally and from below into basement areas

Particularly affected are:

  • Cellar window

  • Light wells

  • components in contact with the ground

In many cases, the problem is only noticed when there is already water in the building.

The solution: Precisely fitting protection for the basement window

After the damage had been repaired, it was decided to take specific precautions.
The aim was to find a solution that:

  • reliably protects against water penetration

  • does not require extensive structural modifications

  • is precisely adapted to the existing basement window

A custom-fit flood protection solution for basement windows was used, which was specially configured for this installation situation.

Result: low investment, great protection

The investment for the protection solution amounted to 1,550 euros.

Since the assembly:

  • the basement window is reliably secured against water ingress

  • further damage caused by heavy rain could be prevented

  • there is a permanent precaution against rising groundwater levels

The comparison clearly shows how effective targeted prevention can be:

120,000 € damage vs. 1,550 € provision

Why prevention is particularly important today

Extreme weather events are on the rise. At the same time, the groundwater level is rising permanently in many regions.
The risk of water ingress into basements is growing – even independently of rivers or above-ground flooding.

Targeted protection of vulnerable areas can help to avoid high follow-up costs.

Configure protection solution for your basement window

Every installation situation is different.
The configurator can be used to put together a suitable protection solution for basement windows in just a few steps.

Configure protective windows now

Conclusion

This practical example shows that water damage does not suddenly appear “out of nowhere” – but is often foreseeable.
With a comparatively small investment, the risk can be significantly reduced and your own home sustainably protected.

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