How do I fence the slope?

I think the idea of asking in the forum is good. I would prefer to ask the neighbor in question. In the first photo, you can see his gutter, which then lies on the upper edge of your embankment; in other words, his windows (if any) on this side are hardly usable. I believe his enthusiasm for tall planting near the boundary is very limited?

It must be said that his surveyor made a mistake in measuring the height of his property. In other words, the surveyor measured 70cm too little. That's why his house is so low. As a result, he also had to put higher L-stones at the bottom.

Honestly, I don't care about his view because of the planning error. I didn't dig myself in too deep.

He could have also signed for 1m L-stones above ground level and not like now 60cm, so I don't see any problem in that regard.

Since the development plan says nothing about fencing, the Baybo probably applies, meaning more than 80cm. This would also fit well with the height of his neighbor's boundary.

It must be said that his surveyor made a mistake in measuring the elevation of his property. In other words, the surveyor measured 70 cm too little. That’s why his house is so low.

How can that be – did he take the prefix "Ver" too literally – then "rough estimator" would be more appropriate – this is a profession that requires proven expertise (???) If is reading: how could the "course" of such a huge discrepancy be imaginable?

Well, the 60cm drawn in by the neighbor in our submission planning is from the submitted submission planning of the neighbor, and you can see for yourself that it is not a 60cm L-stone. My architect "measured" our "we would like to know how deep the terrain is" measurement with a 5 cm deviation.

Regarding the last photo: Not only does it have, let's say mildly, a concrete look outside, but it also has the terrace on the side, that is, the east. That means, roughly from 2 pm everything is shaded. At least that was my impression in late summer.

Also, you can tell that many people in the building area did not really coordinate with each other. One simply blocked the other's view.

Wow, 70cm too deep and then a terrace in the east. I would bury myself.

Is a hornbeam hedge with 2 tensioned support wires really enough as fall protection? I would find that a decent alternative to L-stones + [Doppelstabmatte]. By the way, the ugliest combination ever.

Wow, 70cm too deep and then a terrace in the east. I would dig myself in.

He did that too

I don't find the combination that ugly, properly planted it can be designed very time-saving and labor-friendly. A hornbeam hedge just grows endlessly and can be trimmed 1-2 times a year.