Geothermal energy + ventilation system + photovoltaics would easily cost 40,000 EUR, leaving a saving of 60,000 EUR. With that, the house would still be quite expensive at 740,000 EUR including incidental building costs but excluding the land, according to other priorities.
However, this should increase the KFW. And you get a few thousand more from the KFW.
Are they then ready to go immediately after the building permit?
Yes. Groundworks are planned for 09/13, as well as everything else afterwards. Now the building permit has to come by 08/20 at the latest so that the preliminary work (construction road, tree felling, and fine staking) can be completed.
In certain circles, it goes like that. People have a garden house and a pool house where not only equipment is stored, but fully equipped living with all the trimmings is possible. Depending on the possibilities, there is also a sports house right by the private tennis court. I already know how I would spend my trust fund millions. But wrong family. Both my own and the one I married into. Fortunately, there are still other things to enjoy.