Raised embankment by neighbors, allowed? What to do?

And where does your rainwater go at the moment if your soil is clayey? Nothing should really change if it also takes care of its drainage.

I am not a drainage or construction expert, but the strip is only 3m of lawn at our place and the gravel drainage at the house, I would assume we drain through that. Roof water goes into a cistern for toilet flushing.

Our question, is it allowed to simply raise a natural slope?

What does your state building code say regarding embankments? In Rhineland-Palatinate, for example, you are allowed to raise or excavate up to 2 meters without a permit, on an area of up to 300 sqm.

What does your state building code say regarding embankments? In Rhineland-Palatinate, for example, you are allowed to embank or excavate up to 2m without a permit, on an area of up to 300sqm.

Unfortunately, in Bavaria it even says 500 sqm.