Cost estimation Bauhaus style

Flat roofs involve sealing and also load distribution. With high snow loads, they must not sag in the middle (a few millimeters are enough and cracks will appear). Complex roof drainage, flashing for the surrounding masonry, etc.

Regarding the Bauhaus style: It thrives on large glass fronts, cubic bay windows, offset between floors, roof terraces, loggias, wide-spanning canopies, an integrated garage, strong color contrasts, etc. ... basically everything that makes house construction expensive. The economical version without the mentioned features unfortunately often ends up in practice as a white flat-roofed cube with the charm of a newly built medical office building from the 90s. It then appears neither chic nor particularly aesthetic. It simply looks cheap.

You are currently competing with Karsten with his sayings

I wouldn't even want to try that, we are different enough. Your quote will surprise some readers because the original was altered by me (I had noticed that the OP had already admitted that it was probably not the same).

Hello,

would a construction with a general contractor [GU] maybe also be an option for you? If yes, then have the house calculated by a good [GU]. This will give you a rough estimate of what the house will cost.

Bauhaus style means to me the actual look from the outside. People say it’s more expensive, so we can also call it a modern two-story house. After a lot of internet research, I still don’t understand what makes the price of a Bauhaus style more expensive, maybe someone can explain?

Bauhaus is much more than the "look from outside," in particular it is a minimalist living style, whose implementation unfortunately is extremely expensive. Although everything looks very simple, flat, and puristic, the execution is more complicated and elaborate than any kind of decoration on a nightgown.

What would help me more than 2500/sqm would be the indication for individual trades, roughly estimated

That would be roughly the price floor, that’s where Bauhaus at best starts...

About Bauhaus style: It lives from large glass fronts, cubic bay windows, offsets between floors, roof terraces, loggias, wide-spanning canopies, an integrated garage, strong color contrasts, etc. ... basically everything that makes building a house expensive.

...and much more that makes the construction more expensive

The budget variant without the mentioned features unfortunately often ends up in practice as a white flat-roofed cube with the charm of a newly built medical office from the 90s. It then looks neither chic nor particularly aesthetic. It just looks cheap.

... You speak my mind, these supposed "Bauhaus" houses from GU’s online advertising on a major real estate search site are abysmally ugly and calling them Bauhaus is already a violation of the term.

Everything that is built on top of that, whether saddle roof, lectern roof, or hipped roof, is more expensive or am I thinking wrong?

Yep. A truss is something different than a covering.

Air heat pump involves more electricity costs or can someone convince me otherwise in this matter?
The architect raved about the water-conducting fireplace and emphasized its benefit to save electricity for the heat pump? How much does something like that cost?

Foundation costs are a different budget than ongoing consumption costs.

What would you calculate for windows, mostly sliding and fixed glass elements in the back and common windows in the other part of the house? I can’t estimate that at all!

Normal ones are fine too

You don’t need to convince me otherwise, the house will be built

Don’t be so aggressive and biased right away...

Then I would like to apologize! I think it sounds different when written than it is meant!

You have indeed already given me approaches that I am considering, and I do not want to take anyone’s Bauhaus style away!

In the end, it is such that a financing option looks good for us, the actual style of the house is not that important to us, so that we were directly excited by a flat roof from the city villa model. We were also impressed by a prefabricated garage because of the price! What the architect makes out of it, we do not know yet! We were also convinced to forego clinker for price reasons!
What is really important to us is a similar space offer and modern, but cost-efficient energy technology!

I am not arrogant enough to believe everything is possible for half the money!
So could we save money again if we put a pitched roof (22 to 25) degrees on it? Would we then have a slant on the 1st floor? We actually don’t want that! There are these roofs that end flush with the edge of the house; I like that, and additionally, we would have created space that way?
A very interesting aspect that is presented here and was exactly often built in the street as well (2VG and pitched roof).

I am also thinking about the topic of the air heat pump, but it will in any case be addressed by the energy consultant regarding the cost/benefit issue?

Again on the topic of Bauhaus style! The word seems to have been misused by me, but maybe I’ll write a short objection!
I think that modern architecture similar to Bauhaus style is also interesting to laypeople, just without an integrated garage with a slight offset, e.g., in the entrance area, with a slightly slanted roof and optical color contrast and, of course, large windows!