So 9m² I still find okay. We have 7 for the technical room and everything fits in comfortably – however, we don’t have an extra boiler but water integrated into the heating system. Also, there is a separate room for the washing machine.
I find the storage situation untenable. I would put the wardrobe in the hallway, make it wider, and instead connect a small storage room / pantry to the kitchen.
Also, I would extend the house if you really want the 4.50m in the living room that badly. Screw the money.
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