I think we have this kind of "mixed type" Seriously.
Regarding the planned development, I have already asked the neighbors by the way. Both still don’t know exactly what they want. However, I have heard that No. 7 is considering a house with 2 rental units. Therefore, it would probably be good to shield a bit more in this direction. No. 6 will very likely not build as shown in the plan. He will certainly make his driveway from the west at the bottom, so the garage at the very bottom on the north end and possibly with an adjoining structure to our property boundary. South of that then the house and then towards the south the garden. Then our west side would be mostly free.
Regarding the sewer connection: As already mentioned, this would be positioned quite far down and due to the road slope roughly on the same height level as the house floor slab (considering no basement). Since the sewer is supposedly laid 4.5m below the surface, there should be no problems up to the ground floor. Having a basement might be tight.
I have read here and there that often, just to be safe, the street level is used as a reference. But then there shouldn’t be any basement without a lifting station even on level plots...?