Floor plan design of a two-family house, city villa with a hipped roof

The additional costs of about 300k you will never recover.

Apart from the fact that I find the additional cost estimate high: Besides the rental income, the depreciation of 50% of the house (with equally sized residential units) at 3% over 33 years is a nice factor. In addition, there are proportional depreciation possibilities for maintenance and repairs. What is also unknown is who else benefits from the rented apartment. Your consideration is too incomplete for a conclusion.

The house will not be rented out for the time being. Both apartments are used by the family. Later on, it may be that one apartment is rented out. Maybe someone has an idea on how the floor plan could be improved. I look forward to all suggestions!

both apartments get the same floor plan.

both apartments get the same floor plan.

What I think of that or that it is planning nonsense, I have already stated.

Why should that be planning rubbish?

I think what you suggested is planning nonsense... but that's okay. Everyone has a different opinion.

Maybe someone still has an opinion/suggestion about the floor plan besides ypg