Spacious single-family house planned over 200 sqm

At 1.80 m knee wall, I find windows to be a problem. For double-wing windows, there is too little roof, normal windows are too low.

Furnish the house properly once to scale and think about what furniture you want. 3D can look good, but then the table is too small, the sofa for dolls, etc. Especially your special features like bookshelf, shoe collection, oversized bed must be determined.
Is the room big enough for the hobby?

You have dimensioned everything very generously, it can be smaller without losing quality of life. Compromises must be made regarding the house size.

Does the development plan really not specify anything?
With 2 full floors and 25-degree roof pitch, you have about 40 sqm with over 2 m height. Keep an eye on the area.

There could be some issues with the stairs and the wall thicknesses during implementation.

Without restricting the external dimensions, the house can easily be made deeper by the relevant wall thickness.

3D can look good, but then the table is too small, the sofa is for dolls, etc.

That is the general problem when a 3D presentation meets clients lacking a sense of dimension (which is the usual case, otherwise the demand for 3D would be significantly weaker): with furniture that is too small, the presentation, despite its untruthfulness, appears as "proof" that everything fits. A similar thing applies to colors and textures in drawings: even what doesn’t actually fit looks "realistically" supposedly good.

The sketch is actually drawn so that 2 squares equal 1 meter (1 square = 0.5 m). Sorry that we didn’t do dimensioning in the TZ style.

I think that is also easy to recognize. You also thought about the wall thicknesses (except for some interior walls)

Whoever comes from a house with a basement doesn’t want to miss it anymore despite the significant extra cost

I know it differently: once you think about what you really need what for, you gladly leave it out. You also have to realize that household chores over several levels are somewhat more tedious than just one or two floors...

The relatively important guest room goes into the basement for us,

Overnight guests per year: 4-6

I don’t understand that now Why would a pull-out sofa be so bad?

cool pantry

Fridge?

Laundry room

Utility room?

space for wood,

But not in the house... it will rot.

and relatively cheap storage space.

The basement is never cheap!

I find a kitchen where the sun shines in at Saturday or Sunday breakfast better than just evening sun.

But you don’t have any morning sun there at all.

Especially since in midsummer it shouldn’t be too hot when eating dinner than with a southwest orientation now?

Uh... under those conditions, you sit on the terrace.

Why still have a hobby room on the ground floor if there is a basement to be added?

Either because the room was left over or the cousin has it like that.

So would you suggest maybe only 9 m width instead of 10 m?

Without a site plan you can’t judge that.

It is roughly 30 x 30 m. Located on the edge of town and south of the property runs the street parallel. That’s why the garage is in the southeastern corner.

Please post it. Basically, you don’t build bigger than you need. You also don’t need a room that is used 10 days a year. The room becomes deserted and dusty. In the third year, stored clothes are deposited there. You now have the all-purpose room with 4.5 x 13 meters. I would first cut 3-4 meters to get a cozy room. It’s not nice when it’s long and narrow. In addition, you currently have 15 sqm of storage space plus a hobby room, which is nothing else. I would also see that as a point of criticism. Because that makes a basement dispensable. Even if you now say that you or you yourselves don’t have to clean, it is or will become a house with empty space. And then I would in your place deal with contemporary building or living space. Even if your cousin has a great house and your parents have a great basement, you want to build your house that meets your needs. If after some time you still decide on a basement and co, then so be it. Then build it. But what can be read from this thread here are old habits that have little to do in this millennium.

Even though I generally like the draft as previously mentioned, two comments made me skeptical: 1. The efficiency in the use of space - a lot of room is needed for traffic routes without really providing generosity or flexibility for the future (e.g. age-appropriate / possible division for rental...) 2. The guest room in the basement - of course, the number of overnight guests can change - especially if an au pair or exchange student arrives. In this case, at least the light is missing (or is there a light well?), possibly also the bathroom nearby (I have not seen the basement).

1. Efficiency in the use of space - A lot of space is needed for traffic routes without really providing generosity or flexibility for the future (e.g. age-appropriate / possible division for rental...).

Yes, the more I look at it, the more I see a Sims house.

Is planoben exactly north or is it north with a few degrees deviation? As I said, an accurate site plan would help.

I don’t know about storing wood in the basement at all. Usually, you build a weather-protected wood storage outside.

I already asked once ... what is the hobby room on the ground floor intended for? The home office is supposed to be upstairs ... I would find it better, for example, on the ground floor, then you are separated from the children’s level and close to the coffee machine. The office is also planned quite generously with 15 sqm.

... I consider the bathroom on the ground floor to be very usable in terms of size and layout. But as you say, one should consider where a guest sleeps—