This is just hearsay from a blog i follow but noteworthy nonetheless;
"not only are the craftsmen missing but even the simplest building materials such as:
- Structural steel
- drainage pipes
And if you still get something, then only at exorbitant prices.
Example roof batten: At the end of 2020 this cost around € 0.45 per running meter, now it's already € 2.50.
in the case of wood, there are supposed to be massive purchases from the USA and China, in the case of the drainage pipes there should be a lack of raw materials for production. Stones (the white sand-lime bricks) were problematic 25 years ago - now again.
We only notice a few things because we are currently building and the craftsmen have problems. The bottom has just been poured and the order given to the carpenter and he needs € 13,000 more, because despite a firm order the supplier suddenly wants more.
Even firm commitments are only delivered to the craftsmen in pieces, because the building material dealers can't get anything
If you haven't started building yet, you'd better put it back at the moment.
One could also file this under inflation and supply shortages."