Create driveway with 25% incline?

We are overcoming just under 2 meters of elevation difference over a length of 12 meters. So we have a slope of about 17%.

Then you can report from experience how you would perceive the driveway (both in terms of the angle at the front and the slope) if you had to overcome 3 meters of elevation difference instead of 2 meters. So the slope would be 1.5 times as steep as before. That is then the OP's request.

Should it even be for vehicles or to save the stairs for the lawn mower?

Normal driveway for a car, (parking space) the problem is that I don't want a 1.5m (exaggeratedly speaking) staircase to the front door! Why would I drive up with the car if I then still have to go up a high staircase?

So about 15% incline already looks really crappy :( staircase +- 76cm :( all the measurements are not 100% +-.

But I assume that the 1.8m height comes very close to the actual value unfortunately :( from the outside it doesn't look nearly that high, but when the basement is already 2m + ceiling etc....

all the measurements are not 100% +- .

I couldn't have said it better. Not a single usable clarification from possible competent respondents for five pennies, but regularly new elaborate drawings from graphic programs. I really hope that this botched house exists only in imagination and believe you are a man with a female forum name chosen with the calculation of a blonde bonus. That is very unfortunate, because you are here in a forum where help would be close at hand: drop the act, put your cards on the table, and you could already get a colorful selection of useful tips. But in a free country, of course, one may also clown around if one prefers (although I would recommend other venues for that). Arrivederci, in the dark season I unfortunately have to keep my distance from popcorn threads for the sake of my figure.

Sarah, without any kidding or grumbling, but you will have to reschedule that. Given the heights, I would generally question the access to the house at this point.

The house is already standing?

Your landscaper will take care of that.