Repurposing hall into residential space in the outdoor area on a former farm

Hello everyone,
I am hoping for a brilliant idea or tips from you.

I am the daughter of a former farmer.
Our former farm is located in a rural area.
The lands are leased.
The farmstead consists of my father’s residential house (including 3 apartments).
My brother’s house.
A barn.
Some old stable buildings.
AND a machine hall.

Since I would like to move back to the countryside with my husband and I would like to have my horses at the house, we would also like to build a house on the farm and live there without city noise.
My family very much welcomes this.

Now my question:
For the machine hall (trapezoidal sheet metal, steel beams) I would like to apply for a change of use to residential space. I am aware that the external appearance would have to be preserved. Nevertheless, we would like to pursue this.
Since, simply put, there is a shortage of housing throughout Germany, I hope that we have a chance of conversion.
Does anyone here have experience with this? The land on which the hall stands as well as the pasture would be transferred to me by my father.

If a change of use is absolutely not possible, the next and probably last option would be to officially transfer the farm to my brother, demolish the hall and build a life estate for my father in place of the hall. Which of course would have to be applied for. If that were approved, we would build an age-appropriate bungalow and live there ourselves... The land would of course then pass to my brother with the farm transfer, meaning it could not be transferred to me, right?

Moving into one of the existing apartments is not an option.

Thank you for your tips, tricks and creative ideas on how we might still be able to realize our dream with horses at the house and a dog in the garden.
:-)

Motorhome or caravan with American dimensions,
Option 1 in the brainstorming.

Basically, you can throw all your plans in the trash. You will neither achieve a change of use nor a building permit. Existing rights yes, new construction no.

In the outer area, you are not allowed to do anything at all. Not even a grill pavilion or a 3 x 3 m tool shed are permitted to be built there. Nothing. Everything only with approval, and in many cases, you do not get it.

Nevertheless. Trying makes you smarter.

How is the conversion of the machine hall into living space supposed to look in practice?

Like this?



(Image screenshotted from Youtube)

So the father is a former farmer. I did not gather from the story what the brother has to do with agriculture. If you don’t just want to keep your own horse there (and preferably are also a horse manager), I would see you as more suitable to run the horse-related part of the farm than your brother (?)

The lack of living space is worth nothing to you: it mostly concerns the local municipality, but the "lower" landscape protection through the regulation of the almost no-permission requirement in the outer area is the district’s responsibility. I am not allowed to slaughter myself just because my grandfather was a butcher. So the only advantage you can leverage, I see, is your own professional connection to the farmstead, with which you could establish an "operational apartment." However, I cannot tell you how many (external) horses that would require.

Moving into one of the existing apartments would not be an option.

Who lives there instead of you – would there be an uninhabited one that could be given up?

How is a conversion of the machine hall into living space supposed to look practically?

Like this?



(Image screenshotted from Youtube)

In theory, if we really had the possibility to implement it, there are quite a few options. Of course, an architect would have to develop it.