Base plate / foundation-capable soil and co.

Hello everyone,

I have a question that I would like to explain with a theoretical situation:

Assuming the ground of the construction site consists of 3 meters of topsoil/fill, so no load-bearing soil, and one wants the top edge of the foundation slab to be at the current natural ground level. What possibilities are there for this?

My thoughts to explain what I mean:
- I have heard that a floating slab does not necessarily have to lie on load-bearing soil if at least X cm of soil under the slab is replaced with fill material.
- I have heard that besides the floating slab, there is also the possibility of foundations.
- Is it necessary to remove all 3 meters in every case, or are there alternative foundation options?

As you can tell, I am unfortunately completely unfamiliar with this topic and am very worried about the potential costs with 3 meters of fill/compaction.

Thank you very much for your thoughts.

A geologist gives you a recommendation to found [a company].

Everything else is just guesswork.

Assuming the ground of the building plot consists of 3 meters of topsoil/fill, so no load-bearing soil, and one wants the top edge of the slab to be at the current natural terrain level. What options are there for this?

Build a basement!

so we had to replace one meter and then add another meter on top. With that money, you could afford a solid garage. For 3 meters, I would definitely build a basement if there are no other technical solutions.