I have often asked myself the same questions. Our construction project in a cheap big city is currently at around 750k, of which about 620k is a loan, since no wealthy family, no inheritance/gifts, no support, or anything like that. To manage such an amount in a reasonable time, one should preferably choose a 3000 installment (I have never seen this magnitude here in the forum). So I also wonder which professional groups in this country could have afforded this under these circumstances. As I said, a very cheap big city without good employers. When we wanted to choose such an installment, the bank did not cooperate; instead, we now have about 2500€/month and a 10% p.a. special repayment option for free. We are three-quarters through the construction phase, and I think it will not even stay within the budget and some projects will have to be postponed. But without the details, the numbers do not really mean much, because everyone has their wishes and standards. If you are willing to compromise and well connected, much is also possible for significantly less.