Renovation of existing ground floor apartment - additional office

Honestly? No matter how you plan it. It will always remain an unfortunate and expensive mess for you.
For me personally, only a move would be an option. Why stick to this suboptimal apartment? If the car is too small, you also buy a new one.

It is not just an apartment, it is our house, with a location perfect for me. Unobstructed, large plot, schools and kindergartens 50m away.
I want to stay there...
And I hope that maybe a brilliant idea will still come out...

Isn't it possible to expand after all?

Can you still build an extension?

I wouldn't know where. Only if you remove the terrace and, as suggested, add a conservatory...

I want to stay there...

Sorry, but you have to accept one fate. Botched floor plan or new house. Honestly: look for something new. P.S. You had written that it is only an apartment. To take over from the parents. Makes the decision even easier

I think this has already been suggested, but I don't know how it was received: if the property is large, relocate the office to a kind of garden house?

The extension does not necessarily have to become a conservatory, please mentally detach yourself from my suggestion. A solid roof and a normal window are also perfectly fine! Otherwise, there are also convincing shading solutions for conservatories.

Depending on the design, that would be 6 to 10 m2 more—exactly what you are still missing! And since you already have an architect on board, she should rack her brains on how to design and integrate such an extension...