Demolition of existing house - new construction: what does the development plan allow?

About the Baunutzungsverordnung mentioned in the explanation (see attachment)?

You can also find that on the WWW. However, it is rather unimportant, as the changes in the Baunutzungsverordnung before 1990 were very minor. To be safe, you can ask for the version underlying the development plan (1962, 1968, or newer in case of development plan amendments).

Is the entire area outlined by the blue building line allowed to be used as the ground floor?

Yes, unless the floor area ratio is so small that it opposes this (very unlikely).

I suspect there is a maximum ridge height that, with a 50-degree roof pitch, restricts the attic floor area so that it is significantly smaller than the area outlined in blue. Do you see it the same way?

Only if your suspicion is correct. Height regulations were rather the exception back then, so I assume there are none here.
However, these and further questions can only be answered once the entire graphical part and the complete written provisions are known.

How likely is it to be allowed to add outbuildings (double garage and hobby workshop, no shed) again to a new residential building there?

You should especially clarify this question directly with the municipality. With older development plans, the chances for exemptions are usually quite good, but this depends on many local conditions, so advice in the forum has a low hit rate.

What do you mean by "replace with new"? Do you mean the same as I do: demolition and new construction at the old locations in a slightly altered configuration (double garage instead of shed)? Best regards Jo

If you demolish and build something new, to my knowledge you need a building permit. Then it could be that a shed or something like that will not be approved. But to somehow replace the existing structures little by little... 1:1... Existing structures are often tolerated. Maybe I imagine it simpler than it is. But I once read that the replacement building was no longer approved later. The builders would have been better off leaving everything as it was and renewing it little by little, i.e., "modernizing" the shed.

Height specifications were rather the exception back then, so I assume there are none here.

Hit! I inquired again. There is no usage template and no textual specifications.
Only the requirements I attached to the PDF.

I don’t see a building window

I thought the building window was the blue-bordered area.

But somehow swap the existing structures, little by little... 1:1... Existing structures are often tolerated.

Now I got it

We will try to sketch the two floors with the info we have.
Thanks for the suggestions and the nudge
Jo!

I inquired again.

Also regarding the other questions? Applicable version of the Baunutzungsverordnung?

and no textual determinations

I would have assumed that they are not complete, considering the headings 1. DETERMINATIONS and 3. FURTHER DETERMINATIONS and the different page formats. But if only one heading was cut off...

I see nothing about floor area ratio, plot ratio ... in the development plan.

The floor area ratio is 0.4, regardless of which version of the Baunutzungsverordnung applies. Since the number of permitted full floors does not emerge from the development plan, the plot ratio is not clear. It lies between 0.4 (Baunutzungsverordnung 1962, one full floor) and 0.8 (Baunutzungsverordnung 1968, two full floors).

I thought the building window was the area bordered in blue.

That is correct.

But somehow exchange the existing stock, little by little... 1:1...

According to the construction condition description in #4, I do not think that is a good idea. My opinion: everything gone, everything new. According to the determinations, a double garage could be difficult, but here too the development plan is IMO not clear. It does specify areas for garages but does not exclude them outside the buildable areas. Therefore, I see a large scope for negotiation regarding garages and ancillary facilities.

Sorry for the delay. I have been very busy with work over the past few weeks. Just a quick note for completeness that the 1970 valid [Baunutzungsverordnung] would apply. Best regards Jo

50° pitches are really steep and I already consider them a weapon-license-required gable roof. I wouldn't want to fully utilize those.

We have 55° with a small knee wall on the first floor. The usual roof pitch really depends on the region. In Franconia, 55° is quite normal.