Attic / Full floor

I then have to get the development plan because it is a two-family house, and I have to check whether a third apartment would be permitted. If everything were allowed and feasible, to my understanding, the requirements for the clear height of the attic would be as follows:

I would take care of that first if I were you. If there is a development plan, at least currently a maximum of 2 dwelling units are permitted there. Maybe it wasn’t regulated that way before, but currently, as mentioned, about 90% of development plans are designed for a maximum of 2 dwelling units.

If 3 dwelling units are allowed, then you should look for an architect who can provide references in this area. It’s not rocket science, but there are some things to consider. To what extent this is possible with an existing property needs to be clarified:

[*]Fire protection
[*]Escape routes
[*]Statics
[*]Sound insulation
[*]Service shafts
[*]Storage rooms 6 sqm

[*]Parking spaces for bicycles and strollers
[*]Playground
[*]Parking spaces

I’m sure I forgot a few things. These are the points that came to my mind from the conversations just now.

xxx.o-sp.de/Lemgo/plan/plan_details.php?pid=11505&L1=20&Art=22711

There I found the development plan with textual determination and justification. It is mandatory to comply with II full floors and the rest that can be derived from it.

I cannot find anywhere whether one, two, or three residential units are allowed.
What applies, for example, if no eaves height, ridge height, or floor area ratio is specified?

Example: under V. 3) b)
"A dormer height of 0.8m is permitted"
If I have that implemented and bring my roof pitch to 45°, currently not 35° despite (DN min. 35°), then I gain almost 3m ridge height above ground level. Since nothing is specified, I would now assume that it is allowed.

Opinions? Thanks for the support...