Is building a house financially feasible?

So I think 350k is already a lot in this constellation. Let's assume that the woman only works part-time after parental leave. Then they have about 3.7k including child benefit per month (maybe a bit more with a tax class change). I find a rate of 1250 okay for 350k. But that would mean 2.5k to live on per month. That is doable. However, I would only feel comfortable with that if there are also 13th monthly salaries or bonuses (of course, these won't be paid this year, but in the long term there is at least the prospect of some more income). But that's a matter of taste. Maybe they are also very frugal if most of the equity was really saved up and only 50k was inherited.

Also, lower construction costs of 50k are certainly possible. Then only 300 would need to be financed and one could perhaps reduce the monthly rate a bit.

The interest rate and income are less of a problem here than the idea of wanting to build at home with an infant. If you’re not a professional and something goes wrong during construction... good luck, the divorce rates are quite high here.

How high are the divorce rates exactly?