Idea generation - Orientation of the house

That one hopefully comes to an agreement with the neighbor, I also assume. But unfortunately, you always have to know the legal situation as well.

Then read it and understand it too!

...especially in the south within acceptance, since the sun is highest there and above the hedge planting. In this case, the hedge would rather be in the shadow of the house ;)

I do not understand your statement here in context. What I meant was the following: The hedge growth with the tall thujas is on the north boundary of the affected neighbor, so he can possibly accept it without much impairment. After all, not much light comes from the north in our latitudes. For the OP, the cypress hedge would be on the south of his property, therefore my note to possibly keep an eye on the shadow casting here before too much impairment occurs. The planned house will probably not be affected at all because it will presumably be far enough away from the boundary, only the garden.

Then read it and understand it too!

I have indeed understood the text, but I am not a lawyer, just a layperson.
My understanding results in the following legal situation:
In the South, according to §27, the original owner is actually obliged to enclose the property, so no communal enclosure applies. Therefore, according to §50, the distance regulation also applies, as it explicitly applies to hedges as well.
However, the neighbor has preceded the original owner’s enclosure obligation.
I do not think I have misunderstood this. Otherwise, I ask for clarification.