Construction costs are currently skyrocketing

With what right does the state interfere with my private property which has already been taxed multiple times? If the heating system is broken, you replace it... And not when someone thinks the best-before date has been reached... And if the house, for example the grandmother's house, is simply not suitable for a heat pump, then that’s just how it is... Depending on the situation, the renovation and new heating system will then exceed the value of the house...

Because the democratic community has agreed on it :)
With what right do you consider a pile of stones your private property?

With what right

With tax law.
Always this fallacy about already taxed income. Strangely, this only comes up with inheritance tax.
But that's commonplace. You pay VAT, vehicle tax, sparkling wine tax, tobacco tax, mineral oil tax, blah blah blah. All from already taxed income.
So it's completely normal. You can find it silly, but it is simply the law.

Have you seen the article about mortgage interest rates on [Tagesschau heute]? It is predicted that an increase above 5% within this year does not seem so unrealistic. And it is also quite well justified. How plausible the justification is I cannot judge, as I did not pay enough attention in economics. But it definitely did not sound unreasonable.

Here are some current prices (net) for the construction of outdoor facilities, maybe someone is interested:

Deliver, install, and compact gravel sub-base 0-32mm (up to 35cm depth): 28€/m²
Deliver, distribute, and smooth lime grit 2-5mm: 18€/m²
Lay concrete paving (plus material cost) up to 8cm thick, sand and compact: 18€/m²
Deliver and install concrete curb 100x25x8cm in concrete: 36€/m²
Lay ceramic tiles (plus material cost for covering) in drainage concrete: 70€/m²
Deliver and install angle stones (100cm wide, 100cm high, 12cm thick): 320€/lfm
Deliver and install drain channel: 105€/lfm
Cut and adjust concrete paving: 10€/lfm
Deliver and install humus (up to 35cm depth) and roll lawn: 30€/m²

Since this is my first offer in 3 years, just throwing the question out to the group: how are the prices viewed? Do you have a reference?

However, if you had read my past posts, you would have known it even before the Tagesschau.

Here, people were dreaming of falling interest rates. Below 3 percent, and my forecast of 7 percent construction interest rates was dismissed as a conspiracy theory.

Inflation is only falling very slightly, completely unexpectedly. Experts had expected much less inflation. Unfortunately, consumer prices keep rising. Especially food. But now the [statistische Bundesamt] has once again changed the basket of goods used to calculate the inflation rate. So it has to go down now.

My preliminary interest rate target remains unchanged at 7 - 8 percent on an annual basis. We are already financing commercial investment goods at between 5.5 and 6 percent real. So why should construction interest rates be significantly lower?

Further interest rate hikes have already been announced by the ECB. We should actually be glad if the 8 percent construction interest rates indicate the preliminary upper limit. But even that I consider an optimistic forecast.

Despite everything, the real estate market is still relatively stable. Price pressure cannot currently be identified. It is clear, however, that it is becoming increasingly difficult to finance a property.

I had read your posts, but still consider Tagesschau to be a more reliable source. :)