Planning 130 sqm single-family house on 500 sqm plot

How far north would you go back and why?

So that you can drive out of your property again without wrecking your car once a year or regularly getting a stiff neck. A turning space and also letting children ride scooters in the yard is just as important as a playground on the lawn.

The internal dimension is 9.52 m with an external dimension of 10 m. An error of 1 cm over 10 m is 0.1%, neither laser measuring devices nor tape measures can do better ;)

Then just draw your bed into the bedroom and your closets into the dressing room and tell me how much space you have left to move around. Not for us, but for your wife!

I thank you in advance for a more clever suggestion.

You have received enough advice. Make something of it.