Construction costs are currently skyrocketing

Then probably in monolithic construction, which is also insulated, just without an external insulation layer. Surely no one is building without complying with the Energy Saving Ordinance.

So the ones I have seen were quite normal brick buildings with 36 cm bricks and mortar. I doubt that they comply with the Energy Saving Ordinance.

95% of the time this will happen, and that would even be a good thing, at the latest in 2024.
Photovoltaics are one of the few things in house construction that actually pay off within 10 years.
The carport for the convertible, for example, will never pay off.

Possibly at the old price. If it becomes mandatory

The photovoltaic mandate—if it ever comes—will be just like all the other mandates. French balconies and whatever else there is.

Either you do it or you don’t. As long as I pay for the whole circus, I also decide what must be done and what not.

And the idea that photovoltaics pay off at the current prices is more wishful thinking. You should rather invest the money in really good insulation because that definitely pays off. I have already seen quite a few new buildings without external insulation but with photovoltaics on the roof. I cannot understand that.

The best current example is the corona vaccination mandate for nursing staff. What use is a law or regulation if it is not enforced... I don’t even want to know how much money went into drafting it etc...

Was the installation feasible in EL? Was this your first time doing it?

We are currently planning to install the controlled residential ventilation ourselves. Although I haven't done it before, I am handy and honestly consider it not too complex. With a proper installation plan + pre-made holes in the concrete ceiling, it should be doable, right?

Attached is a picture of the rough installation on/inside the ceiling.
I was more risk-tolerant and calculated the design myself in Excel (volume flows <2-3m/s, while I neglected the pressure differences).
You can make an installation plan, but afterwards the grid carriers lie differently and you have to improvise. A drone photo afterwards is advisable, so you don’t end up drilling wildly through the ceiling later and hit a line. (Nerve-wracking) All in all, up to this point realizable well in EL.
Additional tip: Grid carrier height should allow DN75 pipes to pass through, otherwise you'll get as frustrated as I did when you have to bend them up – I wouldn’t recommend that to anyone.

Bag of cement 25kg 4.18€
doesn't sound like much, but it is

So the ones I saw were completely normal brick buildings with 36 cm bricks and mortar. I doubt that they comply with the energy saving ordinance.

And you saw exactly that there were no holes in them? Then report them!

Bag of cement 25kg €4.18
doesn't sound like much, but it is

At OBI I am currently still seeing €3.99 and at Toom even €3.79. Although the OBI here in Konstanz apparently no longer has universal cement, only the special types...