Floor plan staircase planning: Does that make sense?

Our energy consultant said that the arrangement with the granny flat would work. It is apparently okay to access the granny flat through a shared hallway.

The granny flat may also be accessed via a shared hallway. However, the hallway here is not shared with your path to your storage cellar or hobby room, but rather part of your "traffic network stairwell." So the tenant of the granny flat basically passes through your residential unit. The main apartment here therefore lacks separateness, which in my opinion results, also in terms of funding, in "a second residential unit, but not two residential units." Only the second one is separated here.

Indeed, that was the intention (we were also advised so from different sources) that we could separate the ground floor and upper floor.

Where was that advice given to you? — that is a generally incorrect piece of advice, and particularly not really beneficial for this design. On "bauen jetzt" I have explained in two posts under the keyword "building for old age" what I think about it. The one, and even more so the potential second granny flat, are, in my view, knee shots for the house design within the scope of possibilities here.

I really appreciate the opinions here

That was "not noticeable," but apology accepted ;-)

and have been reading along for quite a long time.

That is very unfortunate, yet often overlooked: 1. how closely the ability to help and the enlightenment about conditions are linked, 2. that the best design discussion ideally begins as early as possible, ideally right after purchasing the property, and 3. where the questionnaire is located, which is the root of a fruitful design discussion.

We went to a freelance planner and then approached various general contractors, and ultimately decided on one.

It seems to me that was a planner with a promising candidacy for the "Gerddieter Blacklist" ;-)

In your opinion, is the plan really so "messed up" that the advice would be to start over from scratch?

Yes, definitely. "Change of command, heading for new shores!" is the salvation here, no shame, and the royal road to the light!

@11ant you probably don’t do gendering?

Why? — "GesellInnen" is gendered, with a capital internal I like in my Juso days (when Frau Nahles was the federal chairwoman). Should I have said "Gesellys" after Phettberg, or is gendering for you “only authentic with asterisk or colon”?

I didn’t want to shut that down above either, we are definitely open to improvements that we can still implement now.

I keep getting hurt! I think my way into a plan, provide information so that the questioner can understand… and then you see how the OP is online several times but doesn’t answer. and yes, exactly: You don’t just give “improvements” like that because you don’t know who and how many will move in there.

we are having an incredibly hard time,

But when you read such a sentence and see the draft, you can guess that there are many things you are not aware of. Many make the mistake of stuffing a house with anything that the house exhibitions offer. The result: everything in mini, oppressively small or disturbing, so that you either get bothered by walls, corners or furnishings because you can’t reach everything as it should be.

The disposal shaft has too dominant a position.

For me, the pantry pushed into the floor plan is the biggest disturbing factor: the kitchen can’t be sufficiently furnished and the dining table is blocked. If you straighten the entrance area to the office, the ground floor gains through sightlines and spaciousness. Then I see something at the seating window. A fireplace? Possibly that should also be just furniture and not fixed.

The bathtub is much too small.

… as I said above: the dressing room is too narrow (for broad shoulders), the bathtub too small, the shower in the children’s bathroom already “only” a corner shower. What about the space of the stairway now? Can this space be used for a door now?

It is probably okay to reach the granny flat through a shared hallway.

Well, it’s probably not okay if the tenant gets access to your wardrobe and thereby your bag contents. No matter how honest one is: opportunity makes thieves. And he can also get to your laundry if you don’t lock the rooms in the basement.

Who is supposed to live in the granny flat? I do not want to live there permanently.

The right side has the light well (Can you see a little bit of the surroundings or just the embankment?) and the left side has nothing at all. On the left side, the light will always be on.

Is there a ventilation system for the [EWL]? Because the sleeping area and the bathroom cannot be ventilated manually.

I have tried to bring some order into it. Including bathrooms. The measurements are not entirely accurate since some things on the ground floor were only estimated.
Ultimately, I no longer have the motivation because: when creating a hallway on the ground floor for the granny flat/wardrobe, I noticed: the tenant wouldn’t just be able to walk into the wardrobe, they could explore the entire upper floor since the stairs are in front of the basement stairs.
In this respect, I would strongly challenge the general contractor on what they were thinking.
Nevertheless, here are the corrections for the ground floor and upper floor (without consideration of the granny flat)

Sorry if I am often online but do not reply immediately. I look at my phone a lot, but prefer to reply on the PC.

Thank you very much for the suggestions and the drawings. To summarize, you think the granny flat, the pantry, and the bathrooms upstairs are not feasible?

We are a family with 2 children.

We need to let this sink in for a moment, the first day of planning until approval took almost a year. I do not want to wait another year and am considering whether this can be solved with a Tektur.

Currently, no one would move into the granny flat, possibly only one parent in the foreseeable future.

Nobody would move into a self-contained apartment at the moment, foreseeable only if there is a single parent.

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