Well, if the single-family house has to be at 911 and only 910 was measured, then indeed 1 meter is missing. But with the regular construction of the base slab, it is no longer so bad.
Of course, but just take a look at the elevation plan. From 911.70 for the single-family house, you subtract 50 cm for the floor slab, insulation, and a bit of gravel layer, then you'd already be at 911.20, and depending on which corner is being built, there isn't much difference. And unless you want to walk the entire plot at ground level from the ground floor, there's no reason to fill up the entire plot because of that.
of course not the entire property! The rest is the frost skirt. Depending on the construction, the slab is also significantly stronger than 50 cm. Problem solved. We mean the same thing.