Floor plan assistance: 216 sqm single-family house with granny flat & double garage

Is the question probably about the purchase price? 769k turnkey

Sure, somehow you have to be able to classify it. That means including the land. Currently, I am a bit tired, it was a long day. I will give an assessment primarily about the floor plan tomorrow.

I'll attach the originals as they were originally planned.

It is apparent in the ground floor, though, that the biggest fatal blow is the second staircase for the basement apartment in the attic; for that, the upper floors are even more failed than your redesign.

Which problems exactly do you mean? The layout? Path division? Extension? Do you think it is hard to sell?
[...] It is 25 km from Ffm, 15 km from Darmstadt,

Anything other than a condominium structure is not possible here with such high-density profit orientation; a "bad layout" would be a benevolent-friendly way to put it. But it probably won’t be hard to sell; in some locations, literally "everything" gets bought up.

Of course, an attempt was made to get the maximum out of the property. Brazen in terms of price/performance?

Brazen in terms of extracting the maximum exclusively for the developer from the property, i.e., squeezing the buyer for as much money as possible per square meter, absolutely without shame about the almost zero residential value of the room sizes. The "house" is qualitatively an indoor bathroom with a living room. Here, one could have built 126 or maybe even 162 sqm of nice living space. Instead, 216 sqm are squeezed out of this residual volume potential—but in such a way that this solely increases the developer’s profit without offering the buyer even remotely adequate value for it. A "foie gras" made of stone. It makes me shudder, although I have already seen much into the black souls of developers. I can only repeat myself: give up all hope that an "optimization" of a damage limitation would be possible here. The project is hopelessly afflicted by the mania to torture the property through the juice press.

Strollers and wardrobe for 4 people do not fit under the stairs. You have 216 sqm and not 70. Do you want to rent out or just at some point? How many parking spaces must be available? Where is all the building technology? Is the attic designed as a residential unit, separate electricity meter, etc. I stick to living upstairs.

Can only be signed by . Also take a look at the bathroom you planned in your version under the roof. That’s where the two roof structures meet. A shower will not be possible in that niche up there.

And, regarding the layout drawing ... the architect has no other option with the tight planning on the ground floor than to draw in the furniture as it is currently shown.

I would also place the living/TV area completely upstairs. Downstairs there should be a more generous entrance area, with a staircase rather at the right edge. And perhaps consider where the ceiling between the ground floor and the upper floor can be planned so that in the future a space-saving staircase could be installed, making the stairwell area common property to allow access to the attic. Although you really have to think about who would even want or be able to move into such an attic apartment. I would probably disregard that aspect completely. You now have a baby and are planning another ... so for the next 20 years it will be a family home. And after that, you can see. You can sell such a house and, as a couple of parents, look for a more suitable property then.

What is planned .. 1 car or 2 cars? You have to think about bicycles, garden stuff, etc. The garage is already very tight with just 5m internal width. With 2 cars, there is no room left to store anything else in the garage.

And the ground floor without the room behind the garage is just under 50 sqm ... minus the stair area (at least 6 sqm with access area), hallway and entrance (rather 4 to 5 sqm) leaves about 40 sqm for dining/living/cooking. And in my opinion, the simple guest WC without a shower belongs there as well, so that the area behind the garage really becomes a "storage space." That is not generous. And you still want to plan a second staircase in that area.

I don't understand the purpose behind this floor plan...
Is an apartment supposed to be housed in the attic? Where then are the kitchen, bedrooms, etc?
And where would the HO room for working be?