Fill the ground and create a base plate

the blunt repetition of meaningless texts disregarding the comments made so far does not lead to the desired result

The problem is that the property is the last plot on a descending street. During rainfall, logically all the water flows onto the property.

And at the end of the street there is a dam and the edge of the flat earth?

Additionally, the property lies about 1.30 meters lower than the street surface, so it needs to be filled to reach an appropriate height.

Unfortunately, you still don’t provide any basics so that someone could present a professionally-founded second opinion against your layman therapy recommendation. "Appropriate height" for what: to surpass the highest raindrop of the street in front of your property?

A small single-family house 10 m x 8 m is planned

But then you will have to put a garage furnished with two Bentleys next to it so that the house does not look so lost on the invoice next to the terrain modeling.

Repeated review does not help against missing basics. Just so you know. The road is not allowed to drain onto your property. That does not comply with any planning guidelines. But if someone does not want to be helped, there is simply no helping them.

Just saying. The street is not allowed to drain onto your property at all. This does not comply with any planning guidelines.

At the waterfront, landlubbers are trusted to let themselves be sold building plots in the Wadden Sea. Did someone buy a retention basin here? *LOL*

Stupid question: Are you even allowed to fill up 1.3m?

Stupid question: Are you even allowed to fill up 1.3m?

If the OP provides more, one can even answer such questions.