Plan a new building that looks like "Schinkel" or "Persius"

Definitely do it, it's a huge visual gain! It costs a lot of money, but you enjoy it every day.

Otherwise, they are simply there for the look,

I don’t really remember your house (?)

Yes, the window casings would indeed be in the way or you would have to install a corresponding construction.

I don’t see anything there that couldn’t have been successfully solved in earlier times without reinventing the wheel.

We didn't build the style you mentioned (but you can definitely see something similar in the villa districts here), but maybe it encourages you to really build what you want. My dream has always been a house that looks like an old building. When we started dealing with the topic of house construction, it quickly became clear that I am always drawn to American houses and the old "coffee grinder houses" standing in Munich. We then designed the prototype of our house ourselves using an architecture program and asked a regular (=not specialized in this style) architect to turn it into a plan suitable for approval. So, what came out for us is a mix of both, which we really like. If we hadn't built in Germany, it would certainly have become even more "American," but what characterizes this style there is unfortunately often either unaffordable here, takes up too much space, or is not approvable. Some people don't like it at all (among other reasons, I decided against a construction company that said such a style mix just wouldn't work. Well, for me, a construction company that thinks my house is silly just doesn't work :) ), others now stand in front of it and enthusiastically talk to us when we are at the construction site. We are in an established neighborhood where luckily the only rule was that you have to orient yourself to the neighboring buildings in terms of size; everything else like shapes, colors, etc., was free, and personally, I wouldn't have been really happy in a new development area exactly for this reason because I simply don't like the anthracite boxes. Personally, I also hope that I will never be forced to install a photovoltaic system on my house, because despite its high benefits, it would ruin the whole look of the house, but that has to be decided individually. I would therefore advise you just to do it if you find a plot where it is possible, if it is affordable, and if you find a company that says "yes, gladly" and not "oohhh, really?" Whether some 20-year-old architecture student finds it unbelievable and impossible or a neighbor gossips about it, I wouldn't care at all. Enthusiasm is often contagious, and I think individually designed houses are much too rare anyway, so I am happy about every one that simply does not correspond to the anthracite-colored gable roof with complete photovoltaic system and large glass fronts type (which of course also has its justification for those who really like it :)).

For me, this is a project with at best medium-term implementation potential. I am currently well housed, having already built on my parents' property 20 years ago, and as long as they are doing well, nothing will be changed. After that, I will have to see what to do next. Maybe I will stay here until the end of my life. It will probably fail on the fact that I will not find a suitable plot of land in the Berlin metropolitan area that is at least not a deterioration compared to now. Of course, it is always a matter of personal evaluation of certain criteria as to what is an improvement or deterioration.

In any case, I would have the ambition that the next house burns neither heating oil nor gas...

In any case, I would have the ambition that the next house burns neither heating oil nor gas...

It could also burn money directly, which would be "more efficient" in that sense because of a higher efficiency without detours, but unfortunately it doesn't work with bank money ;-)