Building a prefabricated house on an existing basement - experiences?

Hello everyone.
I would need your assessment, maybe someone has already had this topic.

We bought a property with an old building, the house is old and we don't like it, so we want to tear it down.
The basement, on the other hand, is still top, so we are considering not tearing down the basement but building the new house on it.
Does anyone have experience with this? What should be considered? Is it worth it from your point of view?
You also save on development costs and the demolition of the basement.
We have not yet spoken with architects, that would be the next step.

Thank you very much for your assessment!!
Best regards

I am positive about reusing the basement: foundation, house connections and inlets, storage room - everything is there. Removing it just to rebuild it again is nonsense in itself, "architecture" is not the core of a basement. Does the height in the terrain also fit your plans for how the new building should be positioned?

Yes, that is a good point. The basement raises the whole thing quite a bit and actually we really wanted a ground-level entrance. That will now be omitted, but in return we save money and get living space/usable space. Otherwise, we would have built without a basement.

This will be a calculation task to see what ends up being cheaper. I'll just write down my thoughts without knowing the situation on site:

- Demolishing the house without damaging the basement is more complicated and expensive than digging everything away completely.

- Are renovations needed for the basement? Sealing, insulating, etc.?

- Exterior dimensions: It can become very expensive to force a prefabricated house to the dimensions of the existing basement. With fixed grid dimensions, it might even be impossible; the house would have to be smaller, and the protruding basement would also have to be sealed upwards.

- Does the basement ceiling also support walls, or does wall-on-wall construction have to be done, which would mean the basement floor plan already prescribes the future house floor plan.

- Are cable and pipe passages usable, or are new openings necessary?

- Does the staircase exit at a suitable location?

There are certainly more points that would need to be calculated.

Theoretically feasible, but in practice not a good idea in the vast majority of cases. The points from also include the statics of the foundation and the connection / transition between the existing structure and the new construction. Overall, the savings are likely to be small or nonexistent. I would demolish the basement as well.

I do not share the pessimism of my predecessors (and hopefully find time tonight to explain this).

The question here was specifically about a prefabricated house, where the static conditions are different and where the basement regularly does not "follow" the floor plan of the living area.

Perhaps the OP will still post pictures, first of the existing building from the outside and of the site, which could help to clarify some speculations.