How to best proceed with energy renovation? Tax bonus, BAFA, etc.?

Then I'll talk to an energy consultant. It might be insightful and more could come together than I would expect.

You can read through the information sheets online at BAFA, they sometimes provide more funding than you might think, especially for the enclosing measures.

You can read through the fact sheets online at BAFA, they sometimes fund more than you think, especially for the surrounding measures.

I had already looked before, but you're right. I wouldn't have thought that and the energy consultant handles everything (i.e., funding applications), does he know everything that is funded?

yes. ours even said that the underfloor heating runs under heating optimization and is then subsidized more. we'll see^^. if you have to pay for it anyway, they might as well get the maximum out of it.