Calculation and planning, your opinion

Huh? Does the basement stairs come out or go up right in the middle of the living area?

I agree. So the floor plan is strange. The long hallway from the entrance would drive me crazy. You’re always looking through a tunnel. The kitchen is also relatively "small". Definitely wait a bit longer with the floor plan. There are users here with really good tips that you should listen to. You can definitely get a lot more out of the house than now without major cost explosions.

Financially, it should be easy. Your expenses will also decrease in the coming years when your child leaves the house... although one should better not say that too loudly.

How is the soil? Class Z0 or worse? That greatly affects the disposal costs. Of course, it also depends on how much needs to be disposed of and what remains on the property.

With a partial basement, you cannot save as much cost as often thought. In addition, problems are more likely to occur with a partial basement if there is any settlement.

Depending on the soil, settlements in buildings are not uncommon. If the load can be evenly distributed, this is not a problem. With a partial basement, the effort is higher.

Huh? Does the basement stairs come out or go up right in the middle of the living area?

Yes. That was actually intended. I know, it's not everyone's cup of tea. But it is also supposed to act as a room divider. It can be seen better in the picture without exterior walls.

Well, you just have to like it that way.

Are you really a "new user"? - the project seems familiar to me.