What is the value of a fixed price that is not guaranteed?

And what do you mean by having done almost everything wrong?

Although we had negotiated a fairly long price guarantee period, we then mostly exceeded it due to our own fault/ignorance. On the one hand, we dawdled too long with the sale of the previously inhabited house; we could have pushed that through more quickly. Furthermore, we requested an exemption from the development plan, which cost quite a bit of time and was, in hindsight, unwise. Especially since it was pointed out in the forum that the change requests probably would not be approved. Since we couldn’t assess the significance of the change requests, we thought, "Oh, they’ll do it." We considered the exemption just a formality. :)

We also assumed that a few things could run in parallel, which was either not possible or not desired.

We didn’t take seriously that in this federal state no explicit building permit is required, but rather the absence of a permit within three months already constitutes the permit; we simply couldn’t believe that. Although I can be somewhat pushy, ;-) I didn’t follow up consistently enough because I wanted to be considerate of the difficult situation due to Corona, employees’ vacations at the authorities, etc.

For us, the situation is now still acceptable, because the construction company must also be motivated; otherwise, despite all the contracts signed, there would be even more problems. And we have now, I hope, bought that motivation.

Basically, I believe I have learned that currently, as a builder, one is in a significantly worse position than the construction company because demand is so high. I even understand it commercially: Every house that has already been sold this year and will be built next year can now be sold at a significantly higher price. The market principle of supply and demand applies here. The now again falling material prices do not have to be passed on by a construction company.
And, to put it simply: A construction company can afford to pursue a years-long process with an uncertain, even somewhat certain outcome; the builder cannot.

Despite everything, we will be happy if/when we move into the house next year. :-) And, yes, I know, that was naive: We haven’t had nearly as much fun as I had promised myself with the house construction project. ;-) If I had to decide again, I would always choose the existing house. :)

Off Topic: If you have the exact price, then please post it in your thread

Yes, I will do that, but I don't have an exact price yet. I want to list all services in detail so that other forum members can make use of it. Is there a subforum here for prices/costs?

We had negotiated a fairly long price guarantee period, but then mostly exceeded it through our own fault/ignorance.

The open fairness you display, although your construction partner could have behaved more kindly, I find very positive. On the topic of guarantees: Many people tend to shift risks onto others and preferably want full coverage without paying for it. So offers are made to satisfy this need, and these offers come from people who also tend to shift risks onto others and preferably want to achieve the maximum margin.

Is there a subforum here for prices/costs?

Uh, has always been here: https://www.hausbau-forum.de/forums/baukosten-foerderungen.180/

Although we had negotiated a rather long price guarantee period, we mostly exceeded it due to our own fault/ignorance. On the one hand, we dawdled too long with the sale of the previously occupied house; we could have pushed that through faster. Furthermore, we requested an exemption from the development plan, which took quite some time and was unwise in hindsight. Especially since it was pointed out in the forum that the requested changes probably would not be approved. Since we could not assess the significance of the change requests, we thought, "Oh, they will do it." We just considered the exemption a formality. :)

Moreover, we assumed that a few things could run in parallel, which was either not possible or not desired.

We did not take seriously that in this federal state no explicit building permit is required, but the absence of a permit within three months already constitutes the approval; we simply could not believe that. Although I can be quite persistent, ;-) I did not follow up consistently enough because I wanted to be considerate of the difficult situation due to Corona, employee vacations in the authorities, etc.

For us, the situation is now nevertheless acceptable, because the construction company also needs to be motivated; otherwise, despite all concluded contracts, there would be even more problems. And now I hope we have bought that motivation.

Basically, I think I have learned that currently, as a builder, one is in a significantly worse position than the construction company because the demand is so high. From a commercial point of view, I even understand it: Every house that has already been sold this year and will be built next year, I can now sell at a significantly higher price. The market principle of supply and demand applies here. The now again declining material prices do not have to be passed on by a construction company.
And, put simply: a construction company can afford to engage in a years-long process with an uncertain, even fairly certain outcome, but the builder cannot.

Despite everything, we will be glad when/if we move into the house next year. :) And yes, I know, that was naive: We do not have as much fun with the house-building project as I had promised myself. ;-) If I had to decide again, I would always choose the existing house. :)

Thank you very much. Although we are still at the very beginning, what you write already seems somewhat familiar to me. ...

The open fairness you show, although your construction partner could have behaved a bit more kindly, I find very positive. On the topic of guarantees: Many people tend to shift risks onto others and ideally want full coverage without paying for it. So offers are made to satisfy this need, by people who also tend to shift risks onto others and would prefer to achieve the maximum margin.

So, it doesn't have to be full coverage. But it would be nice if one could reduce risks. Why does even wanting to build have to be so exhausting?