Correction for the planning:
Construction water/electricity 2000
Expert 3000
Earthworks 10000 + 5000 buffer
Just follow the link from Bauexperte in #8 and look up, for example, NDS or ask if necessary.
And very important: correct your list
For the earthworks, I find 15 k€ very tight myself (if building with a basement). The excavation pit can quickly be 600 - 800 m³ in size. For the digging and disposal, about 18.- €/m³ apply, so you quickly exceed 10000.- €. However, no shafts for sewage, possibly rainwater cistern, have been dug yet, the excavation pit has not yet been refilled, etc... With a basement, I would plan at least 20 k€...