How can one circumvent the Energy Saving Ordinance and avoid bureaucratic madness?

If the roof insulation alone including installation costs you 10,000 euros, but you save 50 euros per month in heating costs, it will be difficult to prove that "no insulation" is economical.

You’ve got this. Good luck with it and report how it went. Your options are now fully known to you.

It's not just about the existing house. But also about the extension, which will be somewhat larger.

Besides, I don't want to die ignorant. And many of my friends also want to build. It can't hurt to get informed.

To look beyond one's own plate. That's what I try.

If the roof insulation alone including installation costs you 10,000 euros, but you save 50 euros on heating costs per month, it will be difficult to prove that "no insulation" is economical.

You'll manage. Good luck with it and report how it went. Your options are now comprehensively known to you.

Yes IF it is as you say, then it will be stressful.

But IF the insulation of an entire house costs 40k and in the end I don't save anything, then it becomes easy. And now?

As far as I understand, it has to be checked on a case-by-case basis whether retrofitting insulation makes sense or not. Depending on the condition, it can sometimes make more sense, sometimes less, and sometimes none at all. And that is exactly the point. Insulating just for the sake of insulating does not always achieve the result you actually aimed for.

Brilliant thread. I’m torn between a promotional tour for the main conspiracy theorist of the construction scene or a troll.

Somehow reminds me of the guy who wanted a dowsing rod because there might be dangerous water veins on the property.

Even at the risk of actually feeding a troll, I will still try to be factual.
You don’t have to circumvent the energy saving ordinance. You simply use a well-insulating stone for the extension. The rest of the facade will be repainted.
The roof (new and old) is insulated with cellulose. This can also be done as a DIY project and is worthwhile after a few years.
What I also recommend (depending on the construction year of the windows) is either a glass replacement on the east side (often good value for money) or new windows. For very new windows, I recommend those with rebate ventilators to avoid mold.
As for the heating, I would be relaxed at first. As long as it is weather-controlled (which you can recognize by the outdoor sensor), to my knowledge, you don’t have to do anything. However, I don’t know how long it will last like this.
It will also handle the extension, because
1. plenty of reserves were always included in the past, and
2. you have already newly insulated the roof and windows.

I do not know Mr. Fischer personally. However, your worries and fears are partly widespread.
On the other hand, I have only had good experiences with insulation. The house becomes more comfortable and cozy. There are no more cold walls that “radiate.” Likewise, you can keep heating at a low level 24/7 without wasting energy.
In summer, it stays cool, even in the attic.
Is it cost-effective? For many measures, not if you have them carried out by companies.
But with the house, it’s not only about the wallet, but also whether you really feel comfortable.

I suspect (it really is just a suspicion) that you bought the house and want or have to renovate and extend it due to frugality or a limited budget.
Engage intensively with DIY work.

Regards, Joe

Mr. Fischer is a populist, there is nothing more to say about that...

Building or renovating houses nowadays can also be done without insulation, solar, and controlled residential ventilation

But then these have to be well planned and the materials carefully selected.

That makes construction more expensive because it extends the lead time since you have to do some calculations and put some brainpower into it...

That is what very few builders want... most want to keep the double burden as low as possible... so they resort to proven methods, that is StoneX+insulation

In apartment buildings, the situation looks even worse. The owner does not care whether the tenants save energy or not. Every measure according to the Energy Saving Ordinance entitles to a rent increase and the loans for the renovations are inexpensive...

The title of the thread is more than nonsensical... insulation has always been good and sensible... you just have to turn on your brain...