Fitting 3 rooms in a 40 sqm living room. Ideas

I think it's a shame about the beautiful room. What do you need the room for? A home office? Perhaps a separation through clever furnishing would be sufficient?

If I had to decide, I would tend to choose option 2. But most likely, I would make a radical cut and build a wall across the room to get a rectangular living room again. You could insert a light strip or similar into the partition wall to bring the light from the office into the new living room.

Thank you for your suggestions

A separation through clever furnishing is not an option. That is exactly what we currently have and no longer want. We need a closed room.

Best regards

However, the wall would not end parallel with the right hallway wall as shown, but earlier, so that when looking from the hallway into the living room, you can see the wall of the office.

So about the width of the hallway shorter, so that the wall between the office and the sofa nestles against the chimney?

Variant 2 is considerably less appealing to me. In any case, I am thinking of drywall construction, and thus easier to change again. What is going to be done in the office, and what about sockets / lighting etc., i.e. where would something like that need to go exactly? - In my opinion preferably in the solid walls already planned.

So about the width of the hallway shorter, so that the wall between the office and the sofa nestles against the chimney?

Not quite. I thought that the walls stop roughly at the halfway point of the hallway area, do you see what I mean?

In the office, as shown in the 2nd variant, two desks are to be accommodated, as well as 2 shelves.
Regarding the lighting, there is no big problem. In every corner of the living room, there is a ceiling outlet positioned centrally.

PS:
We have also considered making the third room a square in the first window area on the right, that is where the table is drawn in the first version.

The room would only be 8 sqm.
My husband has some concerns that this is too small for a future children's room.
Although we will only stay in the apartment until the house is ready ;-)
Are 8 sqm really that small for a 3 or 4 year old child?

8sqm for a toddler is certainly ok if it is only for sleeping and _storing_ toys, but the playing takes place in your living room. Otherwise - 2sqm for the bed, leaving 6. A wardrobe/dresser leaves 5. The child then also has some Duplo constructions that could stay - suddenly you can no longer get to the bed. Or if the child is already sleeping with you, and the room doesn't need a bed, then it may also work for a while.