The photos, especially those taken by hand, are for the reasons mentioned by in #41 just as meaningful as your subjective perception on site. To get an idea of the topography, a leveled camera with known lens imaging parameters and clearly defined reference objects, such as vertically standing 2m ranging rods, would be required. Better and easier would be a plan with at least 8 elevation points: the four corners of the property and the corresponding points at the foot of the slope.
ich habe nur die 2 eingemessenen Bohrpunkte vom Bodengutachten in Bezug zur Straße
And where are they? Go to the municipality. They surely have the road development plan with exact, closely spaced elevations. For connection to the property, elevation points should also be visible on the property. Maybe they will make you a copy of a section.
ich kann mir vorstellen zu Mitteln, sprich links 0,45 eingraben, rechts 0,45 auffüllen.
According to the contour lines, that is conceivable. As I said, I would rotate the house to reduce the difference even further.
Das sind mehr als 1.5 Meter
wenn dann sind es weniger oder genau 1,5m
Pure speculation!