So I would have to calculate 150cm + 10 + 10/15 to determine the required stone, right?
Yep.
They are supposed to be significantly more expensive.
That may be, but I have no other choice. Except to give up a lot of land and migrate like below into my own property? Is it worth it? You also have to fill in the area, which costs again!? Then better to pay 20% more for the visible side inside. Anthracite is certainly, at least for me, "the suspenders to the belt"...
Who do you look for there, landscape gardener or road builder?
Both can actually do it. We do it ourselves as road builders.
Landscape gardeners are probably cheaper, depending on which road builder you find. They are often affiliated with the construction industry and have a collective agreement. I don’t want to start a fundamental discussion, but what you sometimes see in the landscaping area, we wouldn’t get acceptance for in road construction..., but it usually suffices for the private garden.
Design-wise, the landscape gardeners are definitely usually superior to the road builders. We can do a little curve too..;).
Just an idea: What do you think about placing the L-stone with a one-meter distance from the neighbor first and then having a kind of raised bed one meter wide above it? You can plant it nicely and the L-stone has its base completely on your property.
That works too;).
Plus the depth you need to bury the stone on your side to get enough stability.
Correct. I calculated the foot thickness plus 30 cm for topsoil and, for example, for the driveway, paving plus crushed stone base layer. That should fit;).
However, I have to add that on my higher side there are no traffic loads. Therefore, I am relatively relaxed about the embedding. Usually, the "reverse angle supports" are also reinforced against pressure from the other side.
Sorry, I am very busy professionally and am just writing this down like this. Please don’t look at the spelling;).