Which type of construction suits us well?

I have already roughly skimmed through the [Energieeinsparverordnung]. We will make an appointment with the energy consultant soon and then we'll see

I have already roughly skimmed through the Energy Saving Ordinance. We will soon make an appointment with the energy consultant and then we'll see

So you don't even know what this 40 means?!

Roughly yes. Certain insulation values, certain heating efficiency values, ventilation with heat recovery, and photovoltaic with storage. I don’t know the exact costs for these and I also don’t know exactly how much cost savings they bring (economic efficiency). A passive house should produce as much energy as it consumes.... I want to inform myself about which technology does this sensibly and how.

Hi

The wish for a lot of personal work can best be realized with a local timber construction company.
In timber construction, insulation, foils, OSB, drywall and the like are relatively easy to do compared to masonry construction.

For the new house, we will once again only have the timber frame including the intermediate ceiling and shed roof erected.

Olli

It was meant that with the shorter construction time we save about a five-figure sum in rent. [...] Maybe I got that a bit mixed up, I want to compare prefabricated house construction with solid house construction and we were suggested that in the case of a prefabricated house the shell is up in up to 4 days, which saves 6-10 months compared to a solid house?

So much for the subject of "old wisdom" or rather "fairy tales." It’s not the construction time but only the erection time that is shorter with timber panel construction – which, by the way, also applies to the erection of solid (including brick) panel walls. Theoretically, you pay five figures less rent with Neuschwanstein, but not with a single-family house, especially not one for the targeted budget. It seems to me that you should not yet be left unattended near a sales talker.

As for the thermal transmittance, the "prefabricated house" outshined the "solid house" already forty years ago (even at half the wall thickness!). But even today, your budget expectations rather do not suggest wanting to play energy vanguard when building a house. The additional costs are pretty much organic label–style.

Something similar was also told to me by a friend from the timber construction industry.