Basic land planning

the district building officer has already been spoken to here.

What exactly was discussed with the district building officer?

that the blue area is already on the border of the current development plan

Are you sure you mean development plan and not land use plan?

If you want to get advice here, you first have to clarify the planning law with the municipality or the district building officer. According to the land use plan, the property is still located in the village area (MD). According to the land use ordinance, a maximum floor area ratio of 0.6 is permitted here. However, house no. 38 is already located in the agricultural area. On what basis was this approved? Do you still operate agriculture?

a nice object

No one here knows what you find nice. Please draw a scaled site plan of the property and place your desired building volume on it, taking into account the planning law you have gathered. Note that even if you ignore the minimum distances of 2.5 m to the property boundaries in anticipation of your family’s approval of the construction burden, you must maintain at least 5 m distance to the existing buildings. Then design your desired floor plan on graph paper and let it be discussed here.

The blue area is already a separate parcel, everything is already settled within the family with my sister, i.e. sooner or later I would be the owner of both the red areas and the blue area. The blue area is also already developed as a building plot.

Ok, then my previous post is of course useless. Basically as useless as the property itself (thinking about the future). Sorry!

then my previous post is of course useless

As useless as all our posts here, since the OP was apparently left speechless. Came to look twice more and left again silently. A pity.

As useless as all our posts here, since it apparently left the OP speechless. Came to check twice more and left silently again. What a pity.

It's also understandable when you believe you can fully build on a plot, which doesn't even have 240 sqm, and everyone in the world tells you that it does NOT work THAT way. Nepotism or not - I would also be gasping for air.

Especially the sister will be thrilled: Since he was supposed to receive the property, she will surely get financial compensation. However, according to the new facts, this will likely amount to just a four-digit sum (if at all) for the undevelopable strip of garden land.

First of all, thank you very much for all the answers, even though I can't really understand the tone of some of them. I am just starting to get into the whole topic and trying to evaluate the options I currently have. It is obviously clear that I lack background knowledge here – constructive criticism helps me the most. I don't want to build next year, but rather look at the perspective of whether I can realize my plans within 3-5 years with the existing conditions or if I have to deal with alternatives.

What exactly was discussed with the district master builder?

Are you sure you mean the development plan (Bebauungsplan) and not the land use plan (Flächennutzungsplan)?

If you want to get advice here, you first need to clarify the planning law with the municipality or the district master builder. According to the land use plan, the property is still located in the village area (MD). According to the building use ordinance, a maximum plot ratio of 0.6 is allowed here. However, house no. 38 is already located in the agricultural area. On what basis was it approved here? Do you still operate agriculture?

No one here knows what you find nice. Draw a scaled site plan of the property and, taking into account the planning law you have found out, place your desired building volume "on it." Note that even if you ignore the minimum distances of 2.5 m to the property boundaries in expectation of your family's building application approval, you must keep at least 5 m distance to existing buildings. Then you design your desired floor plan on graph paper and let it be discussed here.

Content-wise, Escroda’s post definitely helps me further, so here are a few more details about it.
> I actually meant the land use plan – sorry for the confusion at this point.
> Agriculture has not been operated since 1970; the buildings shown are all pure residential houses. The last renovation was done by my parents in the early 1990s.
> I definitely take away that I need more information about planning law and will find out more about it. Also and especially on what basis house no. 38 was approved, since this definitely was in the outer area before construction started. Perhaps that could then be transferred to my case.

and Mottenhausen
The goal of this thread was initially to find out if the property is even suitable for construction. One scenario would also be to place a small house built for elderly parents on this property; for this, the area might be suitable, and I would redesign the existing house according to my ideas. Since I could alternatively purchase another property at the moment, it is first about figuring out what can be done with the existing property – so no one here should get hysterical. The comments about the rural area and nepotism – not everyone necessarily has to live in some supposedly great metropolitan area and then drive to the countryside on weekends to recover from city stress. I know both sides and consciously chose one. By the way, in an area where other people actually go on vacation and which has one of the lowest unemployment rates in Germany. Everyone as they like, I would say...
By the way, my sister is not receiving any financial compensation for the “green strip” and the house, so your worries are unfounded in that regard as well.