Price increase - Our construction company wants 21.4% more

yes, but only if you leave out the property and the incidental construction costs ;)

Then you simply cannot compare your house, or only with other houses that have a usable basement.
But you could also just ask your general contractor what your house would cost without a basement.

That's exactly how I see it as well.

I don't want that either – for me, as I said, it was never a point I had compared, or wanted to compare.

I just wanted to mention this and say that this price indication is quite difficult to quantify and also not 100% transparent for home builders :)

That’s why there are different equipment levels both for the living area and for the basement.
There are no limits upwards, so an average is given. And the average for a basement, as long as you don't raise it with gold bars, can be googled and quantified just like the living area.

Even if you now tell me your price per sqm including basement, you absolutely have to specify whether it is fully or partially basemented. Whether you also use the basement partially for living, training, home office, etc. The equipment also changes accordingly.
You don't have to do that for the sqm price of the living area!

Yes exactly, that's true. That's how I arrive at the average price/m² according to Statista etc.

Ultimately, personal details about one’s own project have been given here in previous posts – which in my opinion I can only hardly quantify for my house. So I would (as you say) also have to indicate average values, which are not comparable. It already starts with the fact that it is a WU basement that costs significantly more. Also, southern Baden-Württemberg is not comparable to the East, etc.

Anyway, I just wanted to point out that this statement is not really transparent :)

When I read the prices here....wow....very cheap. With us, apartments already cost at least 3500€/m2 with the simplest fittings and without any extra wishes, etc. Maybe too simply thought and not comparable to houses at all, but I/we have not yet dealt with building a house.
Prices of 2500€ or even 3000€/m2....sounds like paradise :D

But don’t forget that meanwhile the land costs almost as much or sometimes more than the house. So you’re already at 5,000 - 6,000 € / sqm. Plus the additional building costs :-)

Of course it is not transparent, but it helps every prospective builder to make a rough cost estimate at first. And if, according to statistics, the m² of living space in BW has increased by 20%, that is also a statement. It is similar to the average salary. It is and remains an indicator for the industry and qualification.

For , it is relevant what the house will now cost, what negotiation leeway arises, and how she deals with it. I recommend that people in this situation who are not explicitly skilled in negotiation seek professional support. The fact that prices have increased by 20% over a period of just over 2 years is sufficiently plausible and statistically comprehensible. Unfortunately, this is not good news for .

Of course, it’s not transparent, but it helps every prospective builder to first make a rough cost estimate.
And if the m² of living space in BW has increased by 20% according to statistics, that is also a statement.
It’s similar to the average salary. It is and remains an indicator for industry and qualification

I do know what is meant, no question. For orientation, this is definitely not wrong.

Nevertheless, I see it much more differentiated. With an average salary, I can look at: industry / job --> salary – there are no major "exceptions" or things that could be different. There I really know what an identical job in the identical industry can offer on average.

With a house alone, a controlled residential ventilation system, a cistern, wood-aluminum windows, waterproof basement, fireplace, KFW 55 cost so much more that the price easily fluctuates by 20%. Thus, it becomes extremely difficult to orient oneself by that… it’s just an example that, for instance, partially applies to us, so that with the same m² size, in the same building area, the price could easily differ by 20%.