Floor slab builder wanted in the Stuttgart region.

Where is the problem then?

If everything is done correctly, there is none. But imagine the following errors, all of which are not uncommon: errors in staking out resulting in the footing slab being incorrectly positioned in the area; errors in measuring the "excavation" or in interpreting the heights before/after placing the insulation, resulting in the footing slab being at the wrong elevation; work done based on an outdated plan with subsequent shifting of the wall, for example between the HAR and pantry, causing the downpipes to now discharge on the wrong side of the partition wall, and so on. If, as the person responsible for organizing the footing slab, you essentially subcontract the product of the prior supplier, you are no longer clearly on the client side towards the house supplier, but rather in a sandwich position. You will be nervous until the foundation grounding inspection report is safely filed away ;-) I, as the house supplier, would also have no desire to occasionally replace my known reliable footing slab installer with another just because the client prefers him due to a price difference. Conclusion: if you love the thrill and you are the one responsible for the removal of the footing slab, then procure this lot separately – but if your house supplier is the one pressing for this removal, then send him packing.