Floor plan design: Single-family house with basement; 560 sqm plot

From a furnishing perspective alone, that would work, but unfortunately the chimney would no longer be close to the living room. I also don't see any way to position it near the ridge in the upper area spontaneously.

There it is also near the ridge. Or where is the ridge actually? Where are the eaves? But you're right, if you could just change quite a bit spontaneously, then you wouldn't need an architect. Because you should also tackle the upper floor. I have already mentioned that some things are planned very large, unnecessarily large. A bedroom can also be 3 meters deep, it doesn't need 4.37. The storage room is even more necessary upstairs. On the ground floor, a broom can be stored in a kitchen cabinet in case of emergency. That's just the disadvantage of the basement: nothing is readily accessible.

We just looked at how to integrate a storage room into the ground floor, but no matter how the walls are shifted – at first glance, we don’t see any reasonable solution here. Does the floor plan then have to be completely reconsidered? [...]
The first assumption is that if you now try to include a storage room on the ground floor, the whole floor plan no longer works (or hopefully someone here still has a bright idea). Would an assessment from this aspect make sense?

Forcing an additional room into a "finished" floor plan almost never succeeds. The first attempt leads to an unsatisfactory corner, which multiplies through cell division (or at least as "ten little [N*]" backwards) with every attempt to smooth it out. The sequence of steps is (mind you in the preliminary design!) 1. the room program must be created, 2. qualified, and 3. distributed over the floors, then 4. the upper floor is specifically divided and 5. the ground floor is derived from it. Intervening at step 5 results in a mass collision, and steps 4-3-2-1 break down again in reverse. Making a change even in step 6 (everything down to the ground floor has already been transferred from the preliminary design to the design) causes an even louder bang.
Whether a floor plan cackles like a chicken when it can suddenly only flutter instead of fly, I don’t know. The consideration still makes sense, but then instead of the product "The Building Readiness Check," we should use its little brother "The Small Floor Plan Check." Both can be used separately but also as staged rocket boosters. Some architects offer it similarly, but effectively at a higher price. If you come to me or one of my colleagues (or another architect other than the previous one), there is also a "second opinion."
How did you proceed with the previous architect when such an essential element as a whole (even if "small") room only shows up as missing so late? – from Munich to Sylt you shouldn’t only notice in Hannover that one of the children isn’t sitting in the car. Running extra laps with the architect costs time and money. Here it pays off that some young architects adapt to the clients and skip the “preliminary design” stage. That then continues later in cost planning as well [quote ...uhm... Sonneborn].

At what ceiling height do you end up then? Somewhere around 2.90? That could already start to look a bit strange in small rooms.

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There it is also near the ridge. Or where is the ridge anyway? Where are the eaves?
But you are right, if you could spontaneously change quite a lot, then you wouldn't need an architect.
Because you should also sometimes get to the top. I already mentioned that some things are planned very large, unnecessarily large. A bedroom can also be 3 meters deep, it doesn't need 4.37. The storage room upstairs is even more necessary. On the ground floor, a broom can also be stored in a kitchen cabinet if necessary. That's the disadvantage of the basement: nothing is readily accessible.

The entrance is located on the eave side. Ridge and roof are indicated here in top view, an asymmetrical gable roof or staggered shed roof is feasible. We personally wouldn't miss a storage room upstairs that much; a built-in closet would also do there. But a storage room for the ground floor is definitely a point missing when "playing through" everyday situations. I think we need to talk to the architect about this. Mathematically speaking, the building volume should still allow for a storage room at the expense of the office, right? What do you recommend for storage room sizes (or minimum dimensions in terms of furnishability)?

Forcing an additional room into an already "finished" floor plan almost never works. The first attempt leads to an unsatisfactory corner, which multiplies with every attempt to smooth it out by cell division (or at least as "ten little Indians" backwards). The procedure (mind you in the predesign!) is 1. the room program has to be created, 2. qualified, and 3. divided among the floors; then 4. the upper floor is concretely divided and 5. the ground floor is derived from it. Intervening in step 5 leads to a massive collision causing steps 4-3-2-1 to break down again backwards. Making changes even in step 6 (everything down to the ground floor is already transferred from the predesign to the design) causes another loud bang.
I don’t know if a floor plan clucks like a chicken if it suddenly can only flutter instead of fly. The consideration still makes sense, but then instead of the product "The Construction Readiness Check," we should take its little brother "The Small Floor Plan Check." Both can be used individually but also as sequential rocket stages. Some architects offer this similarly, but effectively more expensive. If you come to me or one of my colleagues (or another architect different from the previous one), there’s also a "second opinion."

How did you proceed with the previous architect if such an essential thing as a whole (even if "small") room is only noticed missing so late? - from Munich to Sylt you shouldn’t only realize in Hannover that one of the children is not in the car. Going around in circles with the architect costs time and money. Here it turns out that some young architects adapt to the clients and skip the "predesign" stage. This continues later in the cost planning as well [quote ...uhm... Sonneborn].

Unfortunately, contacting via PM is not possible, are there alternatives?

At what ceiling height will you end up? Somewhere around 2.90? That might start to seem a bit odd in small rooms.

The clear room height would be around ~2.78 m for non-suspended ceilings, around ~2.56 m when suspended (should ideally only affect the corridors). We found room heights (~2.78 m) very pleasant after several visits to model homes. However, room heights are very subjective.

Unfortunately, contacting via PM is not possible, are there alternatives?

Yes, it is, there are two quick ways: 2. enter the mentioned titles of my external posts including the quotation marks into a search engine, then you will find them on "Bauen jetzt"; 1. look deep into my avatar picture's eyes, then you will recognize the provider name behind my name.

First and roof in top view is indicated here, asymmetric gable roof or offset shed roof realizable.

An asymmetric roof looks "crooked" if there is no "reason" for it, i.e. it does not harmoniously continue a peculiarity of the building volume.

Purely arithmetically, the building volume should still yield an additional room at the expense of the office, right?

If rooms were to go "at the expense" of other rooms, one should go back in the planning to where they were forgotten or misdimensioned. Storage rooms do not have an assigned stakeholder person, but serve what I would call the communal purpose of the household. They can occasionally have an additional function as an acoustic buffer (to some people it is startlingly important that K1 and K2 hear nothing from the attempts to conceive K3). Usually several storage rooms are sensible (so better distributed than compact), and they have different purposes (some contents are to be stored for a long time, like clothes for the other half of the year; others should be accessible, like towels / bedding), and sometimes they serve as waiting rooms for flea market goods and bulky waste. I like to have copy paper near the office and towels rather near the bathroom. Junk can go anywhere.

Room heights are very subjective, though.

Not only that. I have two meters fifty ceiling height and classic ceiling lamps; with spotlights I would objectively need less.