Uncertainties regarding size, planning itself is so far completed

Because about 40m2 of basement and about 50m2 of granny flat are included.

Then it is clear to me that 2 flat roof extensions are more expensive than 2 full stories.
But please do not always relate my statements to your own project.

I am speaking in general that 2 full stories are more expensive than a house with knee walls.
And once again, as I already said in the other post, I like the look of your house. Especially the brickwork.

Who builds a house with a larger footprint just so that the usable space in the roof becomes larger because they like sloped ceilings?

No one, so please compare the same footprint.

And I still believe that a house with the same footprint without sloped ceilings is more expensive than a normal one.
Of course, if you add a dormer on each side, the price changes.


About our hipped roof
I would have preferred a house with a flat roof, but it was not allowed. So, I am happy about the extra storage space gained. Since our basement with about 50m2 will eventually be used as a granny flat.

You need to read my post properly. I never said anything about the plot, but about living space. A house with sloped ceilings is certainly not cheaper than one without slopes.
I never said a word about wanting a bigger attic.
And you don’t gain that by the concept of "no slopes," but by the other roof design.

And of course, we planned the slopes, like practically everyone probably does. By the way, our knee walls are high enough for many things, e.g. bed, desk, dressers, or similar.

Hey, I don't want to argue either - for example, I would also find a 2-storey building with a flat roof nice.

But exactly with the extras, I wrote that they really push the price up...

Not related to us, but in general.

You have to read my post properly. I never said anything about the footprint, but about living space. A house with sloping ceilings is certainly not cheaper than one without sloping ceilings.

So you're building a house with a larger footprint and deliberately with sloping ceilings to achieve the same living space as a full-story house. Respect, you must have money to throw away. Do you know how living space is calculated? Have you ever tried to buy a wall unit with a sloping ceiling? It’s obviously cheaper because there’s less wood… I hope you recognize the irony.

I see sloping ceilings as a necessary evil due to the development plan or costs. For example, in another post, it was possible to build a house for 180k euros. Not because he wanted a knee wall but because it was cheaper.

Yes, but you don't really believe that a full floor makes that much difference, do you? As I said, more drywall, more roof area, more expensive windows, possibly dormers - all of these are cost drivers and especially everything on the roof costs. The shell construction itself is the cheapest trade in construction.

If you assume standard house shapes, yes.

If, like you, you build 2 flat roof dormers because the development plan allows nothing else, it is certainly more expensive.

But then we also have to include other architectural highlights on the full floor to be able to compare again.