Construction costs are currently skyrocketing

My girlfriend's coworker is also currently building, and this week the screed is supposed to be laid, statement now: no more heat pumps this year. It is a group that calls itself like the core of an apple. There are always some, but wholesalers want 50-80% more than the normal price, which is why the company says we are waiting, some are supposed to come in February.

…and there are certainly people who pay these moon prices. When I then look at the increases in electricity costs, I fear many long faces after the winter.

...and certainly also the occasional collapsing financing structure, especially for buyers of existing buildings, but also for "I'll take an extra kids' bathroom, an X, a Y..." financiers.

If your quote is correct, then it says "...can". And not MUST. What is so wrong with this way of thinking that a dispute about the qualification of the politicians has to be started here?

The way of thinking itself is certainly not so wrong, but actually even obvious for families with several children. In other words, those who initially need a lot of space, which usually remains empty after a foreseeable time. Nevertheless, this way of thinking is based only on the theoretical approach, which fails in practice for many reasons and is hardly or not at all feasible. At least in today’s time, where so many building regulations have to be complied with and ultimately lead to enormous additional costs....

It's also more suitable for multi-family apartment buildings. My condominium is actually planned as two 1.5-room apartments. If I close the breakthrough again and make a new breakthrough into the stairwell, then I only have to implement a kitchenette in the current bedroom and a drywall partition in the current living room. And then I have them again. I already have two bathrooms. Oh, the heating would have to be connected to another main line somehow, that could get more complicated. But let's see what happens, we have district heating and that is linked to the gas price...

The way of thinking itself is certainly not wrong, but actually quite obvious for families with several children. That is, those who initially need a lot of space, which usually stands empty after a foreseeable time.
Nevertheless, this way of thinking is based only on a theoretical approach, which fails in practice due to many factors and is hardly or not at all feasible to implement. At least in today's times, where so many building regulations must be observed and ultimately entail exorbitant additional costs ....

Nobody said that this foresighted option is free of charge.
And no one claimed that this option is easy to implement.
But some users have already given their examples regarding this way of thinking.