Construction costs 2500 €/m2 realistic solid construction completely

Sorry. But 660 for a house (plot costs 260 including additional construction costs) is almost too much for me. It has to be financed after all. I'm just a regular employee with a normal salary

Not even a single-family house owned is profitable.

Not even a single-family home in ownership is profitable. You only gain more quality of life, but financially it doesn’t pay off. In the long run, you pay off plus interest, before you know it, you have to invest a six-figure amount in modernization and renovation before you have paid off the loan.

I also find that a bit too general. We have already had two inquiries about whether we want to sell our new build. I would have "earned" 80k right away. Reason: The plots are raffled off to local families; whoever gets one has already made money because demand is five times higher than supply. The old real estate wisdom of location, location, location applies here again. Until three weeks ago, we lived in a 200 m2 detached house for rent – compared to the rent, our loan installment is a bargain.

I would always build a house in such a way that it is easy to sell, so to a certain extent it corresponds to general taste and the spirit of the times.

How do you come up with 660k now? Or rather, is your problem then the expensive plot of land? I know that all too well (we paid 330k for the plot and ended up with over 1 million all-in, although we initially calculated with 750k). It only goes as far as you can afford. I guess that’s something everyone here has in common If it’s too expensive... just forget it or build on a different plot. The world is that simple..

Under no circumstances should you "sweeten the numbers"... that always goes wrong. Better calculate it badly everywhere..