Floor plan staircase planning: Does that make sense?

Not at our request. So much for not knowing all the background...

Not by our wish. So much for you don't know all the backgrounds...

It is up to you to enlighten us with the questionnaire and the related backgrounds. The initial post with the completed questionnaire should then also include all plans such as the development plan and site plan with surroundings.

To summarize, one can say that the granny flat, the pantry, and upstairs the bathrooms are, in your opinion, not acceptable? [...] We have to let that sink in first, the first day from planning to approval took almost a year. I don’t want to wait another year and am considering whether this can be solved with a patch.

The design suffers (highly inflammable!) from trying to stuff in too many wishes. The basement granny flat has, considered on its own, the relatively smallest defects. The future ground floor granny flat with its storage room initially used as a pantry is the bigger mess. But the whole house suffers most from the entanglement of the internal access for the purpose of universal convertibility. A patch is a "patch," here, however, a hard relaunch is necessary (which we do not suggest out of sadism but because it is the only chance for a cure). The queues at the building authorities have already become significantly shorter again.

We are a family with 2 children. [...] Currently, no one would move into a granny flat, foreseeably only one parent.

For a family with two children and possibly an individual (parent-in-law), just about every participant in the discussion would probably plan completely differently.

You would impose such a flat with a view of the light court on the parent? I don’t understand the world anymore. Then build a proper guest room and then the parent belongs to the family.

Not according to our wish. So much for not knowing all the backgrounds...

Yes, then bring on the backgrounds. A tiny light-court granny flat is indeed a "mother-in-law seat" in the sense of the word’s meaning for automobiles of the 1930s.

So much for not knowing all the background...

Yes, I asked you to fill out the questionnaire linked here in the subforum so that you could see something more constructive in the criticism.

However, I must also say that I and many others here can already understand the thoughts and wishes. Personally, I have been dealing with house designs long enough for that.

the granny flat,

The granny flat is a granny flat and among other things has the requirement of being separate from the main apartment.

"An apartment or residential unit must have its own entrance, a kitchen or kitchenette, bathroom, and toilet. The apartment must be suitable and intended for permanent residential use. A granny flat counts as a separate apartment if it is self-contained."
Source: KfW

Note well: these are the requirements of the subsidy from the large social fund you want to draw from.

But this does not apply to you in any case.

In the end, it does not matter whether you rent it out. A lot of morality and social thinking play a role here.
It may also be the case for you that you know all this is not right, which at least would explain your reactions to well-intended tips.

Currently, no one would move into a granny flat, foreseeable only if one parent.

What can one say?!
In the end, you can also "fix" staircase layouts, but is that really necessary if they are only supposed to serve the KfW loan anyway? I assume the KfW bank will review the house design. Either you take it only for one residential unit or you arrange for two, then you can apply for double.
But as it is now, it’s nothing.

That’s about the staircase question: they function on their own, but not for two residential units.

However, I take a few things with me, I acknowledge them and they help.

As for the rest, I don’t have much more to say. We will not change a few things when planning. We have to like it, and I will not complain afterwards.

I also think that the topic can be left like that.

We could have helped you, and did so. It's a shame if you prefer resignation :-(