Basement or garage, or basement with integrated garage

Since my wife works part-time as a hairdresser, a room could be planned for that there, and I wouldn’t have the customers standing in the house. The technology could go in the basement, etc., so it would make sense. If so, I would want to plan a spacious single garage and build a carport outside for the second car.

If at all, I would want to plan for a generous single garage and build a carport outside for the second car.

For the layout (even roughly, that is concerning just the room program) I would start with the living floors. The cellar layout often follows from that, ultimately also in the proportions.

Just as an additional point: Without a basement, a technical room is needed on the ground floor. With the same house size, you would therefore have more actual living space, or with the same living space, a smaller house...

I don't quite understand the approach. If it is to be clarified "at the end" whether there is a basement or not, that means to me that the rest of the floor plan is already fixed. But as Robbaut has already pointed out, you have to plan a house with no basement somewhat differently than with one. Would you like to explain what is actually already firmly decided for you?

that the rest of the floor plan is already fixed. But as Robbaut has already pointed out, you have to plan a house without a basement somewhat differently than with one.

I too would be culturally inclined to draw that conclusion - however, it is becoming increasingly common to plan the living space program independently of that and to simply place a basement, where not classically located under the house, as a thick rear end of the garage (or alternatively the carport).

We have Plan A "with basement" and Plan B "without basement". The plan with basement, the exterior dimensions are of course smaller than those with "without". I am mainly concerned whether I save money by building a larger garage with storage space in the attic or a basement right away. 10k € one way or the other should not influence the decision. But if I am "forced" by the slope to set foundations, retaining walls or similar... the basement will probably be cheaper for me than a finished double garage. I think without a soil survey I won’t be able to make a decision either.