I don't find 200m2 plus basement particularly large.
That seems extremely unrealistic to me. Where is 200 sqm + basement considered normal? The houses with 200 sqm living space here are huge "blocks" with two full floors. If you then add a low knee wall, which means you have to spread out even more, such a house will ALWAYS seem huge to an uninformed observer.
We have 156 sqm living space fully basemented and I think it really feels huge. In the house, I always think that too, although contingent on the furnishings. It’s still a shell construction.
Who here has 60 sqm large multipurpose rooms? Yes, some, but that is really very, very large.
I, for example, and I actually find it really good. Strictly speaking, it’s also too large. We now have to buy a huge "knights’ table" so that the dining area doesn’t look empty.
That is definitely an alternative, although I don’t assume we will end up much cheaper there either, since they have to factor in buffers as well.
However, I would definitely reconsider the topic of general contractor (GC) in such a dilemma. If your architect has only received a single offer for the shell construction, then he doesn’t seem particularly well connected. Our GC for 25 houses/year works with three different shell builders.
Despite the margin and risk surcharge, I have the feeling that a GC, through very regular contact with several tradesmen, first of all gets more offers and secondly possibly better prices, so that overall you come out cheaper.
That the architect received only one offer would certainly make me very suspicious.