Cost estimate for a single-family house (2 full floors, basement, attic)

Thank you for the answer Are there any other opinions? The house should then have at least a KfW55 standard with the given specifications, right?

It is difficult to estimate, as ancillary construction costs and the garden on the slope can cost a lot of money depending on the situation.

475T € for the house including garage, incidental construction costs, and garden

Nope .... EUR 538k all in at minimum ... with medium equipment as a KfW 55 efficiency house - plaster house - plus reserve extras. Required earthworks I cannot estimate due to lack of information. Rhineland greetings

Would also roughly estimate 550 thousand euros.