Extension/Conversion: How do you find the floor plan?

How do you find the floor plan? It is an extension or conversion of a detached single-family house. Therefore, not everything that might be conceivable is possible, or it would be too expensive. What would you do differently? What might we have forgotten? (P.S.: There is also a basement, meaning the attached house will be partly basemented afterward)

On the one hand, it would be helpful if you could repost the images in a standard format. There is nothing to read on the ground floor; it hurts the eyes when you want to take a closer look at the ground floor (blur). I assume that the existing building is the left area? Where is north, and where is south? Are the balconies already existing? I am asking about the sensibility of those two things (if the budget is limited and the facade becomes very restless because of them).

Yes sorry, I’ll post it again clearly, but it might only be ready by Monday...

South is to the left of the house by the conservatory. North is accordingly on the kitchen side. The loggia or the balcony are existing. The old building is the left side

I find it very dark in the house. Although you have a south-facing window in the hallway on the ground floor, the living room is only illuminated by the conservatory window. I assume it is a cold conservatory that was simply attached to the panoramic window of the living room sometime in the 80s or 90s. Thus, it cannot be used as an extension of the living room or as a living space. It might barely be enough for the living room, but the middle part will get no light at all; for the dining area, I would install a nice wide patio window in the center of the house so that natural light from the west flows into the house there. Should the entrance area be separated somehow? Wind catch? I wouldn't do that: new front doors don't need a wind catch. Upstairs, I don't like the long and enclosed corridor to the bathroom at all. I would change the layout of the rooms somehow. Do you have two children, or is one room upstairs intended for guests or as an office?

In the dining room there is a west-facing window, but not centered. The windows in the living room are all floor-to-ceiling. I thought that would be enough. We will tear down the windbreak on one side. On the other side there is a fuse box that I would rather not move. Since the door opens there, it probably won’t be too much of a disturbance. In the oh there are two bathrooms. The new bathroom is practically a suite attached to the bedroom. With the new construction I would do it differently as well. So far, this is the best solution for me. So far we have no children. One room will be an office for now. Another is supposed to be a guest room. When there are children, the office and the guest room will go into the attic. Thanks for your suggestions so far. Maybe you can consider my explanations in your thoughts again.

So two children are planned, so upstairs - besides the bedroom and so on - two rooms are justified. I just wanted to check to what extent it might be possible to arrange it differently upstairs. An alternative would perhaps be to use the current bedroom (walk-through room) as a dressing room, and from there (where the washbasins are drawn) to plan the bathroom door, and to plan the bed where room 2 is now. I would be disturbed by my husband's movements before 6 a.m. if I could still be sleeping. And I probably wouldn't be the only one with that opinion ;)

Although light comes through the west window in the dining area, the sunlight falls into the corner and not into the room, since the sun is not directly visible in the west from about September to about April, but more southwest. For me, it would definitely be too dark. Also, the entire central area thus has no residential value for me.

Have you already dealt with how to handle loggias and balconies in old buildings? Possibly sealing them off? On the one hand, it avoids problems, and nowadays these things no longer add value, plus the facade of the entrance side does not look good at all (whether with a gable roof or a shed roof).