Is financing a new single-family house feasible?

The combination of rising interest rates is already very bad if construction prices do not decrease. For a purchase price of €500,000, for example, with a 2% repayment rate and 3% interest, we come to a payment of just under €2,100. In my opinion, for 2 adults with a child, the household net income must already be at least €6,000 if you want to live reasonably. And that is if one works part-time. With €6,000, we are already well above the average income if both do not work full-time. And in my area, you can barely get a terraced house for €500,000.

For a purchase price of €500,000, for example, with a 2% repayment rate and 3% interest, you end up with a payment of just under €2,100. For 2 adults with a child, in my opinion, the household net income has to be at least €6,000 if you want to live reasonably well.

Define “live reasonably well.” If that means constantly buying new brand-name clothes, regularly getting new smartphones or TVs, etc., then I agree with you. But we have two children, and I can assure you that after deducting cold rent or loan installments, we don’t need nearly €4,000 a month.

Often, a lifestyle is used as a calculation basis here, which, in my opinion, you can simply do without for a few years. When my parents started saving many years before actually building the house, our belts were tightened as well, and there was just a period of time, for example, with only cheap vacations (which I didn’t even notice as a child).

Of course, it is ideal if the loan payment only makes up a third of the household net income, because then you don’t have to give up anything despite building a house. But those times are over for most people (in metropolitan areas like Munich, those times have actually been over for a long time even for high earners). But here it is often suggested, to put it bluntly, that you have to go collecting deposit bottles on the weekend if you don’t have at least €3,500 left after deducting cold rent or loan installments.

Currently, two different factors are occurring at the same time. Rising interest rates and the scarcity of resources. The actual price adjustment to the higher interest rates cannot effectively take place because the purchase prices are simply high and rising.

Who built a standard single-family house (land from equity) 2 years ago, could set up a solid financing for 1300€/month. Now the same house costs 1800-1900€/month.

That is quite intense

Everyone has to decide for themselves what they can do without. But personally, I don’t want to restrict myself so much just for a house. It must still be possible to go on vacation or fly twice a year. And even two weeks on a farm holiday aren’t cheap. For me personally, there should still be a surplus of at least €1,000 per month. And if you still spend money on vacation—and you always spend more on vacation than at home—then not much is left as savings for the year. It’s not about always buying a new car, etc. But with, for example, less than €10,000 in savings per year, you don’t get very far with house repairs and buying new cars either. But I’m probably too conservative there.

that you have to go collecting deposit bottles on the weekend, to put it bluntly

Could actually be a good way to boost the household budget.
I once saw a documentary where someone approached this professionally. He got an old station wagon and drove to all the relevant places with events (concerts, football games, etc.). On average, he made 100 EUR per day. When it went well, 150.
If you don’t get overtime pay in your main job and have two left hands for handiwork, that could still be almost 1000 EUR more per month.