Terrace wall to the neighbor - What should we consider?

So the problem is not only mine with the neighbors but also at home with my husband.

That’s what I meant. A really stupid situation. There is no accusation in it – just the realization that I can’t help here.

yes of course, it’s expensive but I want peace. I spoke with the neighbor, he will pay immediately, wants the wall and says that the foundation is accordingly 50cm deep and supported by soil, that must be enough. If the wall is properly anchored, it won’t fall. That’s just his statement, I have no one who can check it and whenever I tell my husband, it causes more drama. We also have a couple of other construction defects. They could have been predicted, but my husband let it slide or rather prefers to argue with me than with the right people.

That’s what I meant. A really stupid situation.
There’s no accusation in it - just the realization that I can’t help here.

yes of course, I just had to get it off my chest but still make sure that things somehow go right here.

Oh, and after the wall, the neighbor wants a fence, we want 180 high, he wants 120, that’s why I think it’s better to separate it because the quarrel simply won’t stop. We are an end terraced house, he’s in the middle, he doesn’t want to feel cramped, but we want everything tall and closed, so I think we should separate the boundary with this simple wire fence or something like that, and he can put up whatever he wants, I don’t have to pay for it. I will then separate my garden later with a 180 fence. Yes, I will pay for it but then I get what I want.

That's what I meant. A really stupid situation.
There's no accusation in it - just the realization that I can't help here.

Sure, I just had to let it out once and still make sure that things somehow run properly here.

Oh, and after the wall, the neighbor wants a fence, we want it 180 high, he wants 120, that's why I think it's better to separate it, because the dispute simply won't stop. We are an end terraced house, he is middle, he doesn't want to be cramped, but we want everything high and closed, so I think we should separate the boundary with this simple wire fence, or something like that, and he can put up whatever he wants, I don't have to pay for it. I will then separate my garden later with a 180 fence. Yes, I will pay for it but then I will have what I want.

and if he wants to set up whatever he wants, I don't have to pay for it.

It's not that simple. You still have to pay.

It's not that simple. You still have to pay.

I read the text but didn't understand everything. I can also set boundaries on my side then I thought.