I don’t see the budget either. The basement, the masonry and roofed double garage, and the dormers with the projections make the house more expensive than 2000€/sqm. Then large sliding door, fireplace?, large courtyard door in the garage... For a basement, one calculates a bit less than 1000€/sqm, I see the double garage here with a 3 (or even 4) in front, a bunch of dormers are elaborate, also in terms of price. I correct the basement upwards: it is supposed to be a living basement - I only see that now. If you plan nearly 300sqm, you also have to be able to pay for it. How do you come to your mentioned budget??? About the floor plan: I assume the living unit is supposed to be divided into two living units later? Then try to furnish the guest room on the ground floor. Barrier-free... hm... could work. Personally, for a single-family house (with children) I don’t like the attached staircases. That always takes away some of the single-family house character. Here too: the hallway on the ground floor is prominent, looks somewhat old-fashioned, and will be dark. What fundamentally failed here: you enter the ground floor (after the staircase) and look at a wall. That is not inviting. I would swap the kitchen area and living room and then of course place an inviting double door with a view opposite the hallway door. I think a dream house is being planned here with 3! offices/guest rooms plus basement rooms – so basically everything is doubled and everything has to work for all eventualities and all this in a higher-priced option. My tip: leave out the basement, make the utility room a bit bigger, and build the double garage as a prefab kit. And consider whether you need the dormers upstairs, because for a separate living unit later you will need a balcony and parking spaces again – do you want to implement that in 20 years? I don’t think you want that. “Fireplace yes, with bench” what does that mean? A stove? That costs extra floor space and also five figures in price!