How high does the house rise - how high to pile up earth (cellar depth low)?

Question to the forum: How do you see the whole thing? Do you have other solutions ready? Or are our concerns unfounded?

My advice is to bring in a good, experienced landscape gardener! He might be able to salvage and save a bit. But from my point of view, it will not be cheap.

What kind of living space is actually in the basement because I only see 2 real windows?

And plan the stairs to the terrace immediately as seating stairs and possibly with planter boxes. I would never pile up to the full planned height! That is too much effort for a then absolutely unattractive garden and rightly offended neighbors who look at L stones.

If we now say goodbye to piling up to full height, then there are probably 3 possibilities:

1) The entire property remains at street level. The front door is reached by a steep staircase. Only in the terrace area is there piling up.
Disadvantages: Base color was nonsense, small light well windows in the basement or then ground floor were unnecessary, a lot of exterior plaster is missing.
Question here: How could terrace and garden lying 2 meters lower be connected in this variant?

2) Like 1), except that there is no piled-up terrace, but a terrace balcony.
Disadvantage: It is hardly possible to walk between the balcony and the garden level (less than 2 meters height).
Question here: Would such a balcony be conceivable as huge enough to go around the corner and include the single-leaf terrace door? If not, is the single-leaf terrace door a safety risk (if opened, it would lead unsecured 2 meters into the depth)?

3) Only one meter is piled up. I doubt whether there is still enough space between the terrace and the green area lying 1 meter lower for (seating) stairs. There is a total of 8 meters of space from the terrace door to the neighboring property. Terrace 3m wide, 2m width for such a seating stair with step, then only 2 meters width for green strip and 1 meter for slope to the property boundary – all seems very tight, but could it work like this?
Also here I would have to have unplastered spots outside plastered – how long does something like this take?

Only one meter will be filled up

And then out through the terrace door with stairs? Or how do you imagine that?

So you guys weren't on site even once?

Yes, we were on site several times, also with the general contractor (GU).
He was the first GU who immediately checked the construction site and, as the only one, noticed that the sewer was not deep underground and that we therefore had to build the basement higher. At that time, we were glad because all the other GUs consulted had planned a normal basement, which would have gone deep underground, which would have failed in our case due to the sewer.

What kind of GU is that? Is this his first house?

He has been around for decades...

You considered raising the basement and retaining walls cheaper than a lifting system?

The "raising" of the basement was more of a cost saving compared to a normally deep basement initially requested by us (which was then not possible).
And yes, there was talk of a necessary retaining wall to the left of the single-leaf terrace door. Otherwise, no costly mandatory walls etc. were promised at that time; rather, it was planned to slope down to the neighbor without masonry.

Honestly, no one here can help.

Actually, there have already been some helpful suggestions.

And then out the terrace door with stairs? Or how do you imagine it?

The terrace naturally at terrace door level. After the terrace then step/stairs down approximately 1 meter.

What kind of living space is actually in the basement because I only see 2 proper windows?

There is a study and a guest room planned.