The weekend is over. We have definitely found an interim solution where we can stay for now while we either continue searching or renovate. We are not yet sure if we will buy the old building, but we are quite certain that we will sell and tear down.
The visit with the energy consultant revealed: the structure is apparently okay. What would need to be looked at is how or whether to insulate the facade, or whether to do interior insulation. Where the house is partially set into the slope, he would consider digging around to insulate and ensure that it is or remains dry.
He would not completely redo the roof structure. He said the beams could be reinforced in places, maybe replace individual ones if necessary, reroof and insulate. But it is worth preserving.
The water damage in the attic is not a big deal. The roof would be re-roofed and insulated anyway, and then replacing the drywall up there would not be a big problem.
He advises to redo the electrical system (which we would do anyway), possibly also the water pipes (which would not be such a big cost driver).
Because of the huge basement, he advises a pellet heating system, also because the stove in the basement provides some ventilation. He said the walls appear to be very thick and made of rubble stone (they did it that way back then), they are very nicely built and he would completely remove the plaster in the basement and leave the masonry exposed because it can breathe better and is also visually nice to look at.
A few steel beams in the basement are corroded / starting to rust on the sides in the earth; he advises reinforcing them. Insulate the basement from above. The floor plan changes we have in mind should not be a problem; he also sees the bathroom on the upper floor as feasible. He said he might not place the tub in the middle of the room, but otherwise the statics should work out. Although he said you don’t really know for sure until you have looked underneath somewhere.
As a very rough estimate, he gave us €1500 / m2 of living space as renovation costs.
He considers the purchase price of the property to be reasonable because the plot is also very large.
Overall, we will talk again next week. Pellet would not be the only option; he suggested others as well.
He said we could consider KFW individual measures or try to reach efficiency house 70, for example. He said a renovated efficiency house 70 would practically be not a huge difference from a new build KFW55, purely in terms of living comfort etc. He said in the old building there are simply thermal bridges that he cannot account for on paper. But even as a KFW 70 it would be a good standard to get the building to. Of course, I can’t judge whether this statement is correct.
How does this sound to you?