Construction costs are currently skyrocketing

That will also have a slab foundation, right? As already calculated, around 30 tons of CO2 for a single-family house are realistic.

Is there possibly a double garage added? For the slab foundation, another 10 tons, making it already 40 tons.

For our KFW-55 house with 135 m2, we needed 550 m3 of natural gas last season, so just over 1 ton of CO2. Just for comparison...

Crazy, my concrete ceiling alone, 23cm, 150m2 weighs 86 tons, slab foundation with double garage and vestibule at about 220m2 and 25cm thickness including foundation should weigh almost 200 tons O.o

I'm curious to see what happens to property prices and rents when building becomes more and more expensive.

When discussing CO², we often like to talk about "tipping points" – here we are heading towards one or have probably already reached one.

As a serious investment object, new construction is no longer worthwhile. The necessary rents cannot be achieved, and the profits of households from the boom are now being eroded by inflation and scarcity. Due to the cash bans, Germany is also beginning to lose its role as a black money real estate haven at least somewhat. Shortly after Corona, it became clear that transactions were fewer, the respective sums higher, and the buyers mostly private (single-family houses, condominiums).

The shortage of listings from brokers indicates a drying up of the market, the asking prices are completely driven by panic. Interest rates are currently rising, and the danger of a real estate bubble is being discussed everywhere. Here too, we read that the banks no longer support the fantasy prices. With cost increases of over 10%, equity must be at least €50,000–80,000 or more higher than last year for such a project in the €600,000–750,000 range to be feasible at all. No one just saves that away – and the alternatives to mathematically cheaper rents are there. It started in Hamburg last year, and this year other large metropolitan regions followed.

So it will be exciting. Especially regarding the ruins that rot unoccupied as investments. If next year the solar roof has to be installed, things will get lively.. ;)

where did I write that one shouldn't pay attention to that? My point is only that a comprehensive concept with purely electric operation of heat generators, e-cars, and other consumers (which will certainly increase in the future) will not be feasible in the near future and therefore gas will also play a role as an energy source. Especially in existing buildings. Of course, something must be done, but at the same time one must remain realistic ;) In Germany, about 1 million heat pumps were sold in 2021, with an increasing trend for the coming years. Calculate the electricity demand for yourself... I don't have anything more to say on that and don't want to spoil the thread further ;)

Your arguments are not the point at all and are probably currently accurate. I just found it fitting to what Hampshire wrote. In general, I find the argumentation itself strange in the climate discussion. We are talking about the future here, so I don't understand how current technical limitations and conditions can be taken as a standard and thereby legitimize things of which we already know today that they will affect us strongly in the future. The past has shown how quickly things can change and develop. There are countless examples of quotations that have really aged badly. :D

We are talking about a CO2 reduction of 65% by 2030. That is practically tomorrow! The climate targets must be achieved as quickly as possible and not only in 50 years. What else do you want to take as a benchmark if not the current technological status? New technologies in the heating market are not in sight and even if the ELWMS is invented today, it will take years until it is available on the market.

Again, something about the allegedly not overloaded power grids: In Aachen, heating rods for WP are no longer approved because the grid has no more capacity!

Here too, the crucial difference is that you can hardly do without a foundation slab, but very much so with a gas heating system. So not everything that limps is a comparison!

Or put differently, a foundation slab means a massive loss of comfort for the sake of the environment, whereas an air-to-water heat pump instead of gas produces exactly the same temperature in the living space. Through subsidies and the like, there are no additional costs either. So an easy way to make a single-family house less harmful to the environment without having to give up anything!

But you can do without that. We build with screw foundations. Those can also be easily dismantled again. The house will be a timber frame construction.

Once again about the allegedly not overloaded power grids: In Aachen, heating elements for heat pumps are no longer approved because the grid has no more capacity!

Do you have a source for that? I am very interested in the topic and haven't found anything quickly. Thanks. :)