Floor plan of a single-family house, feedback

If I compare the last drawing with the first one, I find the last one significantly better

Oh yes, the input here really helped improve it a lot.

Regarding the quote above: There is a reason why architects at large house providers are somewhat disparagingly called "drawing serfs."

You have to say: he works fast. You can forget about a mistake.

She is quite quick, yes, even though by now I am probably one of the somewhat more annoying clients. :)
I cannot and do not want to judge qualities. Apart from minor things, I have no complaints. A mega-star architect would probably have a different approach, but on the one hand I didn’t book that, and on the other hand such a person probably wouldn’t have fun with change requests.

Height of the washbasin usually about 90 cm. The window sill height must then be higher.

It’s an 82 cm one, so the finished floor level at the railing height upstairs is 1.265 m.

I would consider if there is another possibility. I think a mirror is quite important.

I can’t think of a nice one right now. Except to make the window separate, put the washbasin to the left next to it, and the second window above the bathtub.

Minor deviations are acceptable

Where “minor” is again a matter of interpretation, yes.

Therefore: Venetian blinds are a good thing with many south-facing windows

I want to equip all windows all around with darkening/shading anyway. Regardless of type, all will get something, most roller shutters, a few Venetian blinds.

At least with us, you can move windows, doors, and interior walls as you like. As long as you adhere to the development plan (if available) or local customary development and the requirements for window sizes. You could also change that later without having to submit a new building application. I clarified that with our building authority at the time because our floor plan ended up being a bit different from the building application.

I would not place a window above the sink; I would definitely want a mirrored cabinet there. I would move the sink slightly toward the top of the plan and the window toward the bottom of the plan. Then you can also look out of the bathtub and do not need a (impractical, because hard to open and clean) window above the bathtub.

Then just swap the toilet and washbasin if light is still supposed to come from above the tub. I also have to say that the downpipe should be placed advantageously. In my planning, of course, I had thought of the [Strang des Kibas]. Ultimately, the professional has to recognize the problem and coordinate it with the [EG].

Whereas minor is again a matter of interpretation, yes.

Experience report: we moved almost all windows. Changed the size of 3 windows. And merged two windows into one large window. No problem at all.

For the positioning of the house, the size, and everything relevant in the development plan, that is more interesting for the building authority.

Experience report: we moved almost all the windows. Changed the size of 3 windows. And merged two windows into one large window. No problem at all.

When it comes to the positioning of the house, the size, and everything relevant in the development plan, that is more interesting for the building authority.

Sorry, but how can one infer from "their" building authority to others?
One takes 3 months, another 3 years.
One has consultation hours, the other not.
One is picky, the other tolerant.
One wants building amendments, the other not.

The basic rule is: building as per application as per approval. Especially regarding the façade, i.e., the external appearance.

And then the construction company: some are very precise and won’t just rebuild your subsequent changes casually. The client shifts the responsibility onto the company when there is trouble, so why should those responsible take risks and build arbitrary, unapproved changes not authorized by the building authority?

Even though I find it very positive to involve the children in planning their rooms: here I would think about the fact that the children will grow up

This is a common problem for builders, that the family's self-image is a snapshot and "pantha rhei" is overlooked. Not only "children become adults," more attitudes and needs change than one is aware of. For this reason, I always recommend to those seeking my advice to think of the room group KGB (child/guest/office) as fluid. Network sockets in the guest room cost next to nothing. In many children's rooms, the floor plan is already ripe for the round deposit when you imagine rotating the bed (not to mention placing it elsewhere).

Attached are new drawings. There are still two small errors,

The pointless free-standing wall between the living and dining area is a Feng Shui fail both from the terrace and the living room door perspective, the "meaning" of which escapes me at least. It is somehow uncoordinated with anything, even the symbolic color change in the floor plan is misplaced.

There is a reason why this somewhat derogatory term "drawing slaves" is used for architects at large house providers.

Not the architects, but the "architects" are called that. So the human interface between client and CAD, which preferably is not hindered by architectural competence, so as to click through the most ill-considered layperson's wishes.

I would not put a window above the sink; I would definitely want a mirrored cabinet there.

It would be funny to have a one-sided mirrored window where the makeup and shaving faces could also serve to amuse passersby *LOL*