Catch a 2-meter slope, L-shaped stones, dry wall or other ideas?

With 3 walls, the problem is that it's hard to reach the middle area. So I would rather do 2 times waist-high if that's possible.

Yes, I also noticed while visualizing that the middle bed would be a bit difficult to handle :)
Maybe 2x 100cm after all.

Have a structural engineer take a look, since you already filled in under the house.

And build a ramp for transports.

Sure, structural engineer + load plate test will be done, for now we just wanted to know what is possible and how others secure their slopes.
We are meeting again with the excavator on Friday, he apparently has 1-2 ideas, and then we might also consult a garden landscaper, even though they obviously can't really speak about load-bearing capacity, maybe some options will come up.

Step down and include the steps in the garden planning. It does not have to be consistently in 2 steps. Others spend a fortune on raised beds, you get them through the anchoring. Or climbing mounds, slides, etc.

With such slopes, I always think of a stream and a small wooden arch bridge.

Still don't see the problem with putting the actual ground floor into the corridor and then basically using the upper floor as the ground floor... With the amounts of earth to be moved and the costs for modeling, it can't be that much more expensive. No additional story is added, but one is simply "set into the sand".

I would definitely catch that in two stages. That costs you a bit of ground space, but at the same time creates a raised bed. Also, the planting in between visually reduces a lot of the height. I would always prefer a natural stone wall over a concrete wall because it simply looks much nicer.

I agree with the suggestion here, at least regarding "two levels = raised beds." You can make something really nice within the "price range" here. At least cheaper and nicer than with boring L-shaped stones.

Natural stone walls can be nice, but don't have to be :) In any case, they are expensive and, in terms of statics, probably unsuitable at this spot.

My suggestion would therefore be a "cheap" solution with formwork stones + concrete and then cover the ugly walls. From my point of view, this should be significantly cheaper and no worse than with L-shaped stones or natural stones. Especially since, depending on the needs, it could theoretically be done as DIY.

I still don't see the problem with placing the actual ground floor into the corridor and then basically using the upper floor as the ground floor... With the amount of earth that needs to be moved and the costs for modeling, it can't be that much more expensive. It's not about adding a floor, but just "sinking" one into the "sand".

But lowering the entire ground floor means I would have a lot less light, right? It would certainly make the corridor at the back to the garden nicer, but I can't imagine that would be allowed under §34 :(

I agree with the suggestion here, at least regarding "two levels = raised beds". You can make a lot of nice things within the "price range". At least cheaper and nicer than with boring L-shaped stones. Natural stone walls can be nice, but don't have to be :) In any case, these are expensive and probably unsuitable statically at this point. My suggestion would therefore be a "cheap" solution with shuttering blocks + concrete and then covering the ugly walls. From my point of view, this should be significantly cheaper and not worse than with L-shaped stones or natural stones. Also, depending on needs, theoretically doable as DIY.

Shuttering blocks! Yes, that looks to me like the best way, possibly combined with some of the other suggestions here (entrance, raised bed, stairs). We are meeting this week with our deep foundation builder who will discuss the whole thing with the structural engineer again, but we are certainly more optimistic now that the garden doesn't have to become a concrete hell ;)