Construction costs 200m² + 30m² roof terrace + basement (including garage)

Living area ground floor + upper floor 185 sqm, in the basement an office with a large light well of 22 sqm, plus a shower bathroom and a large hallway from the garage, also with natural light. So living area I would say good 200 sqm, usable area approx. 300 sqm.

Yes, modeling was very complex (and expensive). Now still missing are the external stairs, paving (the driveway alone has 100 sqm), terrace covering, (roll) lawn, hedge fences, retractable irrigation,...

Okay. And have you included the terrain modeling in a budget of less than 550k that you are currently at? And do you also have things like controlled residential ventilation, home automation, etc.?

The <550k is purely for the house, no terrain modeling is included. We don’t have controlled residential ventilation, but we do have house control KNX. However, that was done in EL, meaning without EL it would be at least 20k more...