House construction according to the Building Energy Act still acceptable or better KFW55

Our general contractor mainly builds according to the current Energy Saving Ordinance and the surcharge for kfw55 was significantly higher for us than the subsidy.

And since I am allowed to build according to the Energy Saving Ordinance, I am not doing anything illegal.. our successor can then bring the house up to the corresponding energy standard that is then required.

We are having the preparation for photovoltaic installed, otherwise it would probably be difficult to implement later or very time-consuming.

our successor can then bring the house energetically up to the required standard.

Exactly therein I see a strong argument
- in favor of the "future standard," if the house is put on the market in a few years, or
- against the "future standard," if it would already be "outdated" at the time of the house sale.
For example, assuming that with the imminent end of KfW55 funding, the Effizienzhaus 55 will become the legal standard in 2025, a subsequent owner after purchasing probably around 2050 or 2055 would have to retrofit to the Effizienzhaus 55 level. For the buyer around 2050 or 2055, it will presumably be relevant whether the house meets the Effizienzhaus 55 (KfW55) standard or the Effizienzhaus 70 standard (Energy Saving Ordinance 2016 / Building Energy Act). A subsequent owner around 2030 might feel the difference in their wallet, but not yet as a retrofit obligation. However, this model assumes that Greta does not become a career politician and then encounters Annalena too often—otherwise, it could happen faster ;-)

The question "imminent standard already now: yes or no" basically arises with the house as it does with the car: if you want to replace it after three years, extras of the kind "many people find great, but I myself wouldn’t find so important" can be value-relevant; if you want to replace it only after twelve years, the weighting shifts accordingly.

We are having the preparation for photovoltaics done, otherwise it would probably be difficult to implement later or very labor-intensive.

How should I imagine your preparation for photovoltaics?
We are currently building a house. From tomorrow, the screed will be heated according to schedule. Moving in maybe February. Our photovoltaic system with 13.7 kWp is fully installed on the roof. I have mostly organized the topic myself. So first I read a lot, then bought modules, exactly 36 pcs on one pallet (completely black modules on black roof tiles). At the same time, I kept in contact with a solar installer. Some time later, I bought the substructure (the solar installer had given me the parts list). After the roofer’s work was completed, there was a building inspection of the roof with the general contractor. Immediately afterwards, the solar installer did his job and was able to use the scaffolding of the general contractor. At the beginning of January, the inverter will be installed and then commissioning will take place. My photovoltaic system costs a total of about 14,000 euros gross / 11,800 euros net. Our KfW Efficiency House 55 EE receives an air heat pump. Due to the low costs, I will have no electricity costs for household and heat generation over a period of 20 to 25 years (after offsetting the feed-in remuneration).

So, for example, we have installed two slightly thicker empty conduits from the utility room to the attic. That was enough to pull the three strings from above down to the inverter. Then, a network cable was laid from the inverter to the distribution box (switch). This allowed the photovoltaic system to be activated after the utility room floor was completed.

So, for example, we installed two slightly thicker empty conduits from the utility room to the attic. That was enough to pull the three strings from above down to the inverter. Then we also laid a network cable from the inverter to the distribution box (switch). Thus, the photovoltaic system could be activated after the utility room floor was completed.

Empty conduit is also present and the house electrician installed an equipotential bonding connection in the attic. Among other things, he connected the satellite system there and the equipotential bonding for the substructures is also mounted there.
I also considered the timing of the commissioning, especially since from tomorrow the screed will be electrically heated directly. Presumably, the consumption will be 1000 or 1500 kWh of electricity. The heat pump is still missing.

How should I imagine your preparation for photovoltaic?

Like here

So, for example, we laid two somewhat thicker empty conduits from the utility room to the attic. That was enough to pull the three strings from above down to the inverter. Then we also laid a network cable from the inverter to the distribution box (switch).

and as far as I remember, there was also a field expansion in the distribution box.