New construction settlement cracks in a masonry basement. What is still "normal"?

At first glance it looks okay, so more of a visual defect.
But since you are still within the warranty period, I would still have the contractor come around. Maybe he will do something.

A scale must be included on the cracks for documentation. And it should be clear in which areas they are found, in case you want to assert your rights later on. The documentation should also include whether or to what extent the cracks change.

Was there a soil survey back then?

Hello, thank you for the response, we will still make a clean documentation. I applied plaster markers today. Regards, Claus

Why does one sell an architect-designed house after such a short time? There may be some reasons for it, but it is not the norm.

I would immediately suspect that something is wrong here. Of course, it could be for family reasons. Sure.

If I were in your position, I would first investigate the cracks myself. Remove the wallpaper and apply gypsum markers. Then observe over a few weeks. Also place gypsum markers over even the smallest cracks.

If in doubt, chip off the plaster and observe the masonry. Possibly also the floor or the connection of the wall. If the foundation settles, you have to observe that, but then I would also suspect cracks in the floor slab.

However, you don’t need to worry. Cracks especially under the windows are common. Structurally, however, mostly harmless.

So as I said, wallpaper off and gypsum on first. If that also cracks, which it does with the smallest movements, then your house is still shifting. I don’t know exactly what the tolerances for such cracks are, but I think there are concrete measurements.

Great, what you recognize from these image snippets, without a floor plan, without knowledge of load-bearing walls, etc.
For us, the construction technician from the general contractor was already here because of a 0.3mm crack in a non-load-bearing wall in the upper floor, as he said he can’t assess it remotely with just a few pictures.

Get a professional who looks at it on site, everything else is guesswork.

It was the same with us. After 3 years it was over. Then filled and painted. Tip top