Partially level elevated land; should the topsoil be removed first?

Hello,
I hope I am in the right topic area here.

We have a sloped plot where the basement is partially built into the slope. The excavated soil is to be removed and partially reused behind the house in the garden to level the plot.
Now I am wondering if the supposedly better topsoil in the garden area should first be removed, since it will be covered by the supposedly poorer soil from the excavation, so that it can later be used again as the top layer.

I have inserted a cross-section drawing to illustrate.


You can see the currently existing ground level marked in red dashed lines. I have simply drawn the planned level in black as an example.

The question arises because the shell construction company is only responsible for the foundation work, but not for the garden landscaping. They will therefore excavate the soil into the garden and we will deal with it ourselves later... It will probably be fairly irrelevant to them whether they cover the supposedly good topsoil with poorer soil if this is not clarified beforehand. I wanted to discuss this with the shell construction company tomorrow but don’t want to go into the conversation completely unprepared. In addition to further research on my part, I would be interested in your opinion.

Thank you very much in advance

Best regards, Kinderpingui

For your information. Here in the construction area, we mostly have cohesive clay soil, which would basically be used for backfilling and creating the garden.
Here is also a photo of soil already dumped on our property from a neighboring property. Maybe this helps with the assessment.

Basically, one would say you "save the topsoil." However, it doesn’t look that great in the photos. So if I imagine an excavator storing soil on the side for a day and then putting it back later, you get 2 trucks of proper topsoil for the same price.

So it will be relatively indifferent to her whether she throws supposedly good topsoil together with poorer soil

However, the employees of the shell construction company should know the Building Code: § 202 Protection of topsoil Topsoil, which is excavated during the construction and modification of structural facilities as well as during significant other changes to the earth's surface, must be preserved in a usable condition and protected from destruction or waste. So it shouldn’t be entirely indifferent to them. Addressing it is certainly a good idea.

However, the employees of the shell construction company should know the Building Code: § 202 Protection of topsoil Topsoil that is excavated during the construction and modification of buildings as well as during other significant changes to the earth's surface must be preserved in a usable condition and protected from destruction or waste. So it should not be completely indifferent to them. Addressing it is certainly a good idea.

Thank you very much. I was not aware of that! Good advice.

That looks to me on your drawing as if not much needs to be filled in at the back. The civil engineer will also excavate and slope the working space of about 3 m height at the back. In the process, most of the topsoil will probably be removed (which will then also be stored on the side) that you can then fill up with later.