How is the construction boom? Still there?

If I build new and need 1000€ energy per month, there are massive construction defects.

the 1000€ energy costs will be added on top.

How do you manage that? 1,000€ energy cost is already high for an old building, let alone for a new building.

he might already be calculating with 3 € per kwh heating energy, no matter the source.

How do you manage that? €1,000 energy costs are already high for an old building, let alone for a new building.

Admittedly, I am orienting myself towards the higher expected value - I assume 16,000 kWh consumption for a 10-15 year old modern house with gas, 3,500 kWh electricity. I am already at over €700 today with the two new contracts, and it will not get cheaper in the next 6 months, on the contrary. When banks are already calculating €4 per m² operating costs (i.e. €600 for 150 m²), I do not find the value completely unrealistic, and those who cannot pay it will soon have problems.

I assume 16,000 kWh consumption for a 10-15 year old modern house with gas,

The consumption should be lower for such a house. I am currently in talks for a terraced house with 167 sqm, built in 2002, with just under 9,000 kWh of gas ==> and then still liquefied gas. That is currently €140 gas per month, the price will be adjusted to still under €200.

And in your example I am currently at a lean €450 with the basic supplier. That is still far from €1,000 per month.

What can you say, sometimes I am really astonished...
A terraced house, usually a mid-terrace house, can hardly be compared in terms of heat demand with a detached single-family house.

The detached single-family house has 4 exterior walls, the mid-terrace house 2, which are usually also smaller (in area) than the party walls to the neighbors.
At 0°C outside temperature, you naturally lose much more energy through an exterior wall than through a party wall to an adjacent building heated to 20°C.
To make matters worse, the heat transfer is not linear, but depends on delta T... Physics II at university of applied sciences...

The 1,000 EUR were gas and electricity... Not everyone has a basic supply provider and not every basic supply provider is equally cheap.
Family and friends in my old home currently pay 16 cents/kWh for gas, in my new home the basic supplier charges 26 cents/kWh for gas... BEFORE surcharge...