Demolition and new construction, basement, hillside location

So we could go up to 750-800k. But we don't want to ;-)
However, if something unforeseen were to happen, we would not immediately face foreclosure ourselves.

There is no separate BP for the area.
So §34 Building Code. Since there are 1.5-2 story houses there and the plot is just over 1000 sqm, we should be relatively unrestricted in principle. I also think it would be possible to distribute a large part of the excavation still to be carried out to even it out a bit or possibly at some point use it for the garden layout, which would probably be more terraced at least next to the house, meaning that some filling would also be necessary.
Then my idea, or that of the partial basement, is definitely not so wrong.

calculate using the highest pollutant class during demolition. The walls from the 40s and 50s caused more concern to the demolition contractor than the cowshed. Normally everything is thrown into one pile and tested. The worst value determines the pollutant class. We had the gutting done by them. For that money, I won't climb onto the roof and remove tiles. You can't get far with a car trailer either. Asbestos wasn't that expensive. We paid just over 3k in 2017. Remove asbestos, properly package and dispose of it. The night storage heaters were steep.

Therefore, my question is whether it would be more sensible to add a prefabricated basement as a utility cellar on which a house is then built

Then I don't understand the principle of demolishing the existing cellar, because that would be practically equivalent to it.

or whether one builds the cellar in such a way that it is used partially as living space downhill and for that purpose builds one floor less. What is approximately the price difference between a living cellar and a utility cellar?

A living cellar costs like above-ground living space, and thus practically only the living cellar surcharge, as long as the "living cellar instead of utility cellar" saves the same amount of above-ground living area.

When demolishing, calculate based on the highest pollutant class. The walls from the 40s and 50s caused the demolition contractor more worries than the cowshed. Normally, everything is thrown into one pile and tested. The worst value determines the pollutant class.
We had someone else do the gutting. For that money, I’m not climbing on the roof to remove tiles. You can’t get far with a car trailer either.
Asbestos wasn’t that expensive. We paid just over 3k in 2017. Remove asbestos, package it properly, and dispose of it.
The storage heaters were steep.

May I ask what you paid and how many cubic meters were demolished? Apparently, there is an oil heating system in the house.

Then I don’t understand the principle of tearing down the existing basement, since that would practically be equivalent.

Aside from the fact that the measurements don’t correspond to what we imagine, the report notes that the house is damp and there is mold formation, so we strongly assume that the basement will be damp as well. And the structure doesn’t look particularly good in the pictures either. The basement protrudes about half a meter from the ground towards the street, and the entrance going down is at ground level. And we don’t want to put a house on a dilapidated and damp basement, so everything will be torn down and rebuilt.

We had about 750 cubic
6 Bigbag asbestos
6 night storage heaters
was about 50k including permits, gutting, laboratory, disposal, demolition, transport

More than for a normal house. It was an entire courtyard complex

We left the hillside retaining wall standing. Saved the shoring

We had about 750 cubic meters 6 big bag asbestos 6 night storage heaters were about 50k including permit, gutting, laboratory, disposal, demolition, transport More than for a normal house. It was an entire courtyard complex We left the slope-side retaining wall standing. Saved the support

ok, I don’t understand that now. According to the report, it’s about 800 cubic meters for the house, which were estimated at 15-25 per cubic meter (according to information from demolition companies for comparable buildings), so calculated at an average of 20, resulting in 16k calculated plus a flat rate for clearing the property, so they calculate about 20k.