Construction costs are currently skyrocketing

Lumber prices (Lumber) fell by 7 percent on the Chicago futures market on Wednesday. This week, they dropped by a total of 12 percent. Thus, the most important raw material for the construction industry and other sectors has fallen to a new yearly low of 608.60 USD per 1,000 board feet. Overall, prices on the world market have crashed by 47 percent since the beginning of the year and are thus 65 percent below the 2021 peak of 1,733 USD per 1,000 board feet. This drastic price decline is also expected to affect prices at the major international trading centers and, at least in the medium term, significantly push down European export prices for wood. Analysts from the USA also say that the price drop in lumber will reduce the massive inflationary pressure on the real estate market in the USA (but also in Europe) and that construction costs are likely to gradually decrease.
Source: Agrarheute

Currently, we rent a house that is insulated with WVDS. There is also no ventilation system inside, and we ventilate daily. So far, no mold.

But that is exactly the point. All the heat that was painstakingly kept inside the house goes out again. In politics, there is way too much talk about insulation, but far too little about ventilation. I see a much bigger leverage there than further insulating the building envelope.

And sufficient ventilation is harder than it sounds. Outside is noisy, and you don’t want the noise. In winter, disgusting cold air comes in. In calm weather, you can ventilate crosswise as much as you want, but hardly any air exchange occurs. And in strong wind, it drafts and blows like crazy through the apartment. So, in those cases, the windows are open far too briefly.

Analysts from the USA also say that with the price drop in wood, the massive inflationary pressure on the real estate market in the USA (but also in Europe) will decrease, and construction costs are expected to gradually fall

It’s good if wood gets cheaper, but what about everything that needs energy? Since the price increase for wood a year ago, all that has also become much, much more expensive. The price explosion may stop, but regarding significantly falling prices (even only to the level of half a year ago) I am extremely skeptical.

The interest rates have really only risen for about 3 months now, so there will still be some changes.
Yesterday I was at my bank regarding a request for photovoltaic financing, about 40kWp for our last hall roof.
Yep, 3.28% for 10 years. I’d rather save a bit more and invest my account balance there sensibly.
We have already bought the modules.
Thanks to the Easter package and 12.4 cents remuneration, photovoltaic is worthwhile again for feeding in.
But you have to stay under €1000/kWp, meaning self-assembly and 2 weekends of work.

Take a look at the ÖkoKredit from EthikBank.

Very briefly on the contribution from

The heat loss through shock ventilation is completely overrated. Simply because the heat content of the entire room air is only a small fraction of the heat content of ceilings and walls (mass-dependent heat capacity as a keyword).

Energetically, insulating actually makes sense - one should therefore also deal with the problems of the "insulation madness".

Heat capacity is completely irrelevant when it comes to losses through the windows. Window ventilation loses 100% of the heat contained in the exhaust air. Ventilation with heat recovery loses about 10%. The lost energy must then be used again to heat the air from outside. It does not matter whether this happens directly at the radiator or because the wall radiates heat.

That is not the argument. If your numbers are correct, heating 90% more room air is simply peanuts compared to the heating power that the walls consume. [HIER] insulation saves. Ergo, ventilation is a minor issue, especially since shorter ventilation is sufficient in winter because the outside air is drier. In older buildings, heat loss through air exchange was greater because of often leaky windows. They ventilated 24/7 instead of [Stoß], to put it bluntly.