Proposal for the optimal division of a plot with two houses

I would have thought something similar .. but would probably swap the two houses so that the family can get the rather larger garden part.

I would prefer a semi-detached house there. If it is a family, you can vary more than with the classic semi-detached house, so that it tends more towards a two-family house.

Your site plan excerpt is very small to derive actual building boundaries. I still gave it a try (blue dashed line). The information about the requirements for the residential buildings is also very sparse. So I created a proposal using the sparse models from an expansion house provider. I placed the shed on the boundary and shortened it to 9m because of that.

[ATTACH alt="Lageplan.png"]51121[/ATTACH]

Thank you very much, that looks good.
Does this count as building in the second row or not?

Does this count as building in the second row or not?

Some say yes, others say no. §34 Federal Building Code states: (1) Within the continuously built-up parts of a town, a project is permissible if it fits in with the character of the immediate surroundings in terms of the type and extent of structural use, the construction method, and the plot area to be built on, and if the connection to public infrastructure is ensured. The type is a residential house, the extent is the floor area ratio/volume ratio, eaves and ridge height, and the construction method is open – seems to fit the surroundings (as said, the excerpt is too small). There is no mention of second row, but of buildable plot area. And the large multi-family house that you have as a direct neighbor helps you with a generous building window. Eccentric building authority staff might try to prevent the large setback. IMHO unjustly, but then your planner would be called on, who should have sufficient experience in §34 areas to refute the authority's arguments with expertise.