Natural cellar / Earth cellar

Hello everyone,
I wanted to ask for your opinions and experiences regarding natural cellars / earth cellars.
After an inheritance, a house in the family is empty, brief key data:

Built around 1900
1/12 floor
no external insulation
no roof insulation
Natural / earth cellar with submersible pump
Clay-straw insulation from ground floor to upper floor
Single-glazed wooden frame windows

Now to my question, in this mentioned cellar there is a heating system installed on a concrete floor, which has not been in operation for several years. About 40 sqm of the cellar is a natural floor, meaning a hole was dug in the middle of the room and a submersible pump was installed.
The cellar is always damp, the "terrace slabs" lying on the clay/sand floor are always wet.
The cellar ceiling is quite simply insulated with very old insulation material, you can see the supporting beams of the ground floor.
Do you know this problem or do you have experiences / advice? Is it even possible to renovate the house like this, meaning a new roof (roof structure very dilapidated), new bathroom with completely new piping, etc.?

I will upload a few photos.

I am grateful for any advice.

Regards
Daniel

Such a "cellar" is not unusual in houses about 100 years old. The heating system is very likely an oil heating due to the lack of connections. This was only allowed to be installed in conjunction with an oil catchment basin, which is why the heating room was "concreted."

If you absolutely want to keep the property, you should try to reduce the moisture in the cellar as much as possible. There are all sorts of things on the market, technical drainage through drainpipes, chemical injections. Just google "trockenlegung keller." You can also seal the remaining floor. It is best to consult several specialist companies.

Before sealing everything, try to find out if your water connection has been renewed in the last 30-40 years. Water pipes made of lead were installed in the past.

I would first go through it with a professional and have them check whether the house is even worth preserving, or whether it is more likely a bottomless pit.

The basement ceiling has been simply insulated with very old insulation material, you can see the load-bearing beams of the ground floor.

What do you mean by load-bearing beams? - there were various ceiling "systems" after all...

I assume the house only housed the deceased's household and actually has no concrete use anymore (?)

Vacancy is always a risk to the substance of a building, this also applies in essence to partial vacancy (rooms unused forever, or where only junk was stored). When considering the sensibility of renovation, it always plays a role that the property will be managed again afterwards.

Basically, neither the year of construction nor the construction typical of that year nor ailing basement individually indicates that it is not worth it.

Simplified, you can say that renovation costs per fully replaced part (pipes, plaster, windows, etc.) are about the same as if you needed them for a new building. But always plus demolition costs for what was there before. Either you save on this elsewhere (because these can remain as they are, or be reactivated with little effort), or it simply costs more in total. Drying out a basement can require just as much effort as excavating a new one.

Often such old houses have nice details, such as floor tiles in the entrance; and old bricks are also in demand. Old doors and windows can still be useful for 3D scans to authentically recreate the like. In this respect, one should not just "smash to pieces" when demolishing.

Before you seal everything, try to find out if your water connection has been renewed in the last 30-40 years. In the past, water pipes were made of lead.

Yes, the sewage pipes are made of cast iron, the entire installation would have to be redone.

I would first go through it with a professional and have them check whether the house is even worth preserving, or if it will rather be a bottomless pit.

Is there an overview of experts in the Freiburg area here in the forum?
Thanks and regards