initial brainstorming

So the 145m² is planned without the basement.

You are right about the study, maybe it would be better to put it in the basement. Although the room is also supposed to be for our pet. Hmm well, that has to be decided based on the plot and the floor plan.

The many network sockets (although I think that is still few) are needed for so many things. There is already enough radiation everywhere, so you want to avoid WLAN as much as possible. And who likes to transmit data at 300 Mbit when they can also transmit it via cable at 1000 Mbit ;-) Also, movies etc. run more smoothly via cable. Just in the future living room I will need 3 network connections due to the AVR, multimedia receiver, and TV, or a switch.

I also estimated the costs to be around €400,000, nice that you roughly agree with me on that ;-)

Powerline gibt's auch schon mit 1000Mbit/s ;-)
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I would also say that it STARTS at 400k. But you are still in the idea phase, so you can explore and gather information. The matter of radiation makes sense to me. Much more attention should actually be paid to it.

Bauexperte will surely be able to say more precise things about it and will probably get back to us...