Building permit in the outer area

Hello,

we have a field at the edge of a small village in family ownership. Part of the plot was lawn area or there is still a barn standing there today. A part of the field was separated and my sister was allowed to build there (with conditions, e.g. orchard instead of garden).

The village basically consists of houses (only) along a through road. However, in the meantime there is this second row with two residential houses and otherwise barns and agricultural storage halls.

Since my sister was already allowed to build there (despite being in an outer development area): Can one then assume that it is very likely that it would also be approved to demolish the barn in 5, 10 or 20 years and build there instead?

My ball maybe :-)

Fun something like that probably no one here can answer you.

It is best to contact a local architect and commission them to assess the building situation and to conduct research + a preliminary discussion with the building authorities. Building in the outer area is generally heavily regulated and is only possible for so-called privileged building projects according to §35 of the Building Code. Building projects should generally be clarified in terms of planning law and building law as a preliminary building inquiry before further time and money are invested in approval planning.
If the barn is demolished, the existing rights expire - at least in NRW. Probably, only a building of similar use will then be allowed to be erected there. Any different type of use must be coordinated and negotiated with the authorities.