Extension planning for house from the 60s

But these are still old pictures?
Is the conservatory within the thermal envelope? I have seen photos with a heater... do you actually want to tear it down?
How do you plan to do it? Will you continue to live in an extension there?

Yes, some of these are older photos, but externally, except for the windows and vegetation, hardly anything has changed.
We want to stay living there, which is why changes to the existing structure (e.g. removing walls) are hardly possible.
The conservatory was functionally within the thermal envelope. Meanwhile, the radiator has been removed and the panes provide zero insulation (it is glazed all around). So I would no longer count it as part of the thermal envelope.
Furthermore, it is completely worn out structurally and ready for demolition.

It will probably be the easiest solution to extend the gable side by three meters. You need 2 more rooms and you will get them this way. I don't know if connection lines can be laid so easily. If not, you can still leave the covered area at the entrance out and shift a little inside with the hallway. Maybe you can also swap the kitchen with the living room. Digital doodles for inspiration:

Many thanks for the ideas. Do I understand correctly that these are two options for the ground floor? Where will the second children's room be located? Above the extension on the upper floor? Then there would be no access without a walk-through room. The kitchen would not work well on the right side of the plan (because of the parquet floor and the wood stove). Also, the extensive wall shifts and removals would cause a lot of structural problems. Why didn't you make the extension full width? Wouldn't it then seem somewhat "abrupt" in the overall impression? Or is it because of the house connections?

Or is it because of the house connections?

Exactly for that reason. I just wanted to show options. Whether good or bad didn't matter to me.

Exactly for that reason. I just wanted to show options. Whether good or bad didn't matter to me.

OK, now I understand the idea behind it. Is your plan for an extension only on the ground floor or also on the upper floor? In the second case, I don't understand the connection of the room on the upper floor. The current kitchen is a bit too small. You just get in each other's way there. Also, neither of us wants an open kitchen. At most a double sliding door.

In the second case, I don’t understand the connection of the room on the upper floor.

Sorry for the confusion. I thought a picture says more than a thousand words, that a smaller extension is also rubbish. However, I just didn’t want to spend ages drawing on roof walls. I also didn’t want to delete it.

However, one could install a cover on top so that it is as you planned there. That then as a roof. I also find it a bit too difficult now because as an outsider you don't know what has already been done with you and what has not. Find out what this relocation of the connections costs. I am curious.