Extension on an old building from 1965 with an additional storey

With us, the development plans are online on the municipality's website.

First, I would like to do some preliminary planning,

1. First the development plan/34er WHAT the property legally allows.
2. For 34er: Check the surroundings via Google to see how much area could be built upon.
3. Old house plan: where can you start regarding an extension.
2a/3a. Determine needs for parents and own family
4. Planning can begin

Good evening everyone,
those are quite a few answers in one day, now I finally have time to read and respond calmly.
: Yes, of course, I will do that too. I would just like to get some ideas in advance to be able to evaluate the project at all.
The sketch actually only came from a rough measurement, as long as I don't have the proper plans.

: Thanks for the offer, but unfortunately I prefer not to write that in a forum.
Unfortunately, I can’t send a PM yet (too few posts), otherwise I would do that.
In almost all municipalities, I can see the yellow border with the designation; when I click on it, unfortunately nothing happens, not even in cities like Nuremberg or Bamberg. Do you simply have to click on the field? Or maybe register?

: You are of course right, but sometimes impatience is just a bit too big ;-)

You are of course right about that, but sometimes impatience is just a bit too great ;-)

Sorry, but there is no other way. You have to know what you are allowed to do. Otherwise, it can quickly become a waste of time. You will lose yourself in a plan that must never be built and will never be built. It’s not all child’s play ;) Your impatience should be focused precisely on being able to answer number 1.

Yes, I am working on it. If it doesn't work online, then maybe tomorrow by phone / email. Of course, I can only properly plan afterwards, until then it is "brainstorming."

Hello everyone,
I now have a bit more information.

The first picture shows the current status, except for small deviations according to scale.
On the upper floor, the knee wall is about 600mm, there are three rooms, a bathroom, and a storage room.
The exterior walls are 30mm thick, the interior walls 115mm.
The ground floor slab is solid; between the ground floor and upper floor is a wooden beam ceiling.
The ground floor currently has a bathroom, pantry, kitchen, dining room, and living room; however, it still needs a bedroom. The upper floor currently has three rooms, a bathroom, and a storage closet; since it should become a separate apartment, it is identical to the ground floor, and the attic should be converted into three bedrooms with a bathroom. However, to create enough space for everyone, I would like to carry out the following modifications:

1. Extension over the ground floor and first floor to have an additional room on both floors (without a basement). On the second upper floor, there should be a balcony.
2. Possibly an additional extension on the ground floor for an office/winter garden. On the first upper floor there should be a balcony.
3. Raising the roof (with less pitch?), so that three bedrooms with a bathroom and storage room can be created in the current attic.

Since the house has a shared stairwell, everything should be planned so that, if necessary, it can be converted into three separate apartments.

Attached is also a picture of how I roughly imagine it.

Development plan:
According to the responsible municipal employee, this is not a problem here; all neighboring houses are significantly taller and also have different roofs.

Do you perhaps have other ideas or have already done something similar?

Thanks in advance for your feedback

Best regards
Christian