Planning a multi-family house - optimizing costs

And how is the access to the garage? Are all directly accessible from the street? Does it even go over the sidewalk, etc.? That all looks very cramped - regardless of the fact that I don't really see five residential units as approvable...

The street is at the top on the 19 m wide side. The other houses also access their garages and parking spaces via the sidewalk.

I also cannot imagine that you are allowed to drive onto the property over the entire page? Often such things are also regulated.

I also can’t imagine that you are allowed to drive onto the property over the entire area? Often such things are regulated.

Thank you. I found this in the attachments about garages. If I interpret the + correctly, one would probably be allowed to drive over the entire area, right?

I would basically build the building structure the same way, only I would like to subdivide the upper floors OG and possibly DG so that I can rent them out better and my mother doesn’t have a family with several children "dancing around on her head," but rather quiet singles living there.

If you write that the other houses have family apartments, I don’t believe that commercial residential construction will be approved. I probably already wrote that. It’s best to call the building authority. Also regarding the access to the property. What about the neighboring houses? Are there parking spaces in front of the properties, trees, because those are protected. To my knowledge, you get alternatively a 3-meter-wide lowering for accessing your property ...

What I don’t know is whether the area in front of the garage (left side of the picture) can still count as a parking space if it belongs to the same apartment?

No. There is no parking space in front of the garage because the vehicle cannot come out of the garage. Take a look at the state building code of BW regarding multi-family houses. Before the ground floor apartment is already structured, a sensible layout for OG/DG with 2 apartments each plus balconies should first be developed. In which direction the balconies and then the access to the apartments, bicycle parking space and freezer room, best accessible for everyone.

WA | II 0.4 | 0.8 - | ^

I read the "^" here more as "o" (which did not bother here), but regarding the "-", it would be important to know what meaning this field of the usage template is assigned to. If you are lucky, it means full freedom in the question of E, E/D or H and would also allow the already mentioned row houses – such a three-family house could also be quite nice: in the middle the "bungalow as a ground floor apartment" for the mother, flanked on both sides by maisonette apartments (ground floor like a row house, upper floor the mother's apartment each partially above).

that I came to the project like the "Virgin to the child."

Well, here rather to the mother

The rental apartments are intended to finance the house long-term and to secure an additional pension for my mother. That means the two on the 1st floor are for me, to service the loan, and the one in the attic is for my mother as a pension.

Do I understand correctly that 2 out of 5 residential units are supposed to cover the entire loan???