Cost planning for earthworks

No, as far as I understand, the MSH is included and provided by Weberhaus. It is installed by them during the construction of the foundations or the slab. You probably won't have much trouble with the utility providers themselves, except for scheduling after the house is set up, etc.

Everything is correct. That's exactly how I imagine it. First: The plot will be elevated in the area of the foundation slab (civil engineer). Then: The foundation slab including footings and frost skirts will be poured by WeberHaus, with MSH. Finally, the utility provider comes and digs the shafts towards the street and connects everything.

I would like to add the following: In the purchase contract for the property (seller: City of Duisburg), it is explicitly stated that additional foundation work is to be expected and that the buyer is aware of this at the time of signing. So a disclaimer from the city that I am responsible for everything that still needs to be done before I can start building...

Exactly like that :)
Good luck!

PS: check out Adomeit Würselen ... I can recommend it.

Can anyone actually make sense of this? Is such a clause common? Apparently, the soil isn’t that bad after all. And even if this wording weren’t there, the construction ground risk would still lie entirely with the buyer, right??