Construction costs are currently skyrocketing

The term turnkey is also extremely vague. As mentioned, quite a few items were not included. But we also did a lot of work ourselves. Many general contractors included extras that we saved on, e.g. the ventilation system (please no discussion). That would have been 11k more for us. No finished attic with huge roof windows. Or kitchen. It just wasn’t the Berbel hood for €2000. Or the oven has no pyrolysis. That would have been nice, but also "just" €400 more. The equipment makes a big difference.

Absolutely, the materiality and equipment determine the price.

Or kitchen. In that case, it just didn't become the Berbel hood for 2000€. Or the oven doesn't have pyrolysis. That would have been nice, but also just "quickly" 400€ more.

Kitchen has absolutely nothing to do with construction costs. Or do you then also include the new car? Or the riding lawn mower?

Yes, it was just an example of how one can generally save. I know from many families that the initial furnishings in the house are rather inexpensive because the household budget shortly after the construction has gone through a kind of natural disaster. What is purchased years later is often (significantly) higher quality.

Yes, it was just an example of how to generally save money. I know from many families that the initial equipment in the house is rather inexpensive because the household budget shortly after construction has gone through a kind of natural disaster. What is purchased years later is often (significantly) of higher quality.

If the kitchen is no longer included in the construction, something is seriously wrong.

The old couch or the bedroom wardrobe is normal, but a kitchen easily lasts 15-20 years.

that is 2200€/sqm turnkey. These are prices from about 10 to 15 years ago... hard for me to understand right now

No, those are prices from the cheap general contractor with a standard floor plan, without much frills...