What are rubber seals for? Is something leaking? Sorry, but with that standard I see no potential for savings in the rest.
Rubber seals against dust and kitchen fumes! If the prices are what they are, I either have to raise my pain threshold or live without rubber seals and the like. That I don't get an E-Class for the price of a Punto is clear.
The average consumer does not model a hillside property. The average consumer does not live with one child on 200 m². (how many children are you actually planning?)
Without a slope there are no building plots here. The plot itself was already a stroke of luck, which we only got through the waiting list procedure. And seen that way, already a bargain, since in other building areas double the prices are asked for half the current plot size. OK, 200 sqm is indeed a decent size and all the more generous with only 1 child (we/I can/cannot afford a 2nd child anymore due to demands and our age).