Construction costs are currently skyrocketing

Only for those who do not have the income to finance 100%. You yourself know what was requested here in the last year. If someone comes to me with a loan of €550k but only wants to pay a €1200 installment and then has a €4000 household income, they have to save equity.

An appropriate income is of course the basic requirement for this. The other option is to face reality and admit that you simply cannot afford to build a single-family house. Since many would rather be guided by their emotions than trust their common sense, the harakiri financings will not become fewer. Only when the banks put a stop to it. At the moment, however, I still have the impression that practically everything is somehow twisted and approved. Let's see if these absurd price increases change anything...

Apparently, those who save lose. :oops:

Unfortunately true. Those who invest do not save and are able to bear and split the associated risks. Those who have nothing or very little yet are left empty-handed. The "cheap money" is of little use when the goods to be purchased become so much more expensive. A saying like "performance must pay off" sounds cynical when so many high performers have to swim extremely against the financial current—let alone the "ordinary" people. I find the principle of development very worrying.

The moment loans are no longer granted, the entire economic system collapses. The universally desired inflationary development now penetrates the real economy. This only works through loans. An artificially created supply shortage of goods and raw materials, combined with an incredible expansion of the money supply, promotes this development. I do not really believe in a shock-like increase in demand.

There are too many things missing. Worldwide. Of course, it also has to do with Corona. We are in a war. That must be understood.
Corona came from the laboratory, and inflation also comes, so to speak, from the laboratory. And no, this is not a conspiracy theory.

Corona was created to shut down the system. And that is exactly how it will happen,

The moment loans stop being granted, the entire economic system collapses. The widely desired inflationary development is now penetrating the real economy. This only happens through loans. An artificially created shortage of goods and raw materials combined with an incredible expansion of the money supply promotes this development. I really don’t believe in a sudden increase in demand.

Too many things are missing. Worldwide. Of course, this also has to do with Corona. We are in a war. That must be understood.
Corona came from the lab and inflation also, so to speak, comes from the lab. And no, that is not a conspiracy theory.

Corona was created to shut down the system. And that is exactly how it will happen,

That could be. But how do you know that it is not a conspiracy theory?

That Corona comes from the lab is now almost certain. But it could have been an accident. But the rest of your comment?

Speculations about where Corona comes from and claims of "almost certain" are a popular pastime.

I don't really believe in a sudden surge in demand.

On this point, I agree with you; the shortage of goods cannot plausibly be justified by an "unpredictably sudden" increase in demand.
I have the impression that the shortage is a deliberately induced stress test for supply chains. Who benefits from it? Those who are less or hardly affected by the shortage and/or can endure it longer than the competition. In the industry I am currently involved in, it is Chinese companies that, for example, have power relays or certain semiconductors available, which are hardly obtainable in Europe anymore and paralyze production. From a business perspective, in my opinion, it is time to consider supply security more seriously alongside the goals of "efficiency" and "lowest price" after a long phase of seemingly self-evident supply security.
I am moving here in the realm of my own considerations, not in the area of established facts. Take my statements with a "grain of salt."

I have the impression that the scarcity is a deliberately induced stress test for the supply chains. Who benefits from it?

Actually, it benefits no one. Monopolies and cartels can of course dictate prices, but beyond that there are too many players who undercut each other to maximize their own sales or profits. In general, everyone wants to make as much profit as quickly as possible before the business model is undermined by growing competition. This works quite well for common goods like wood. Unfortunately, with semiconductors it quickly tends towards a monopoly. But even here, companies want to maximize current profit, not artificially restrict supply. The oil industry is always interesting when it comes to what the OPEC is doing. Limiting production means higher profit per barrel, but fewer barrels with profit. - Despite the cartel: The state budgets of these countries look anything but rosy.