I don't know how it is with you guys, but I know people who earn less (referring to me) but still build a big house. (I'm not jealous) But I wonder how that's possible?
I've wondered that too :D My main feeling is "it comes as it comes" and "accept residual risk, just do it, as long as the bank says yes."
Of course, there are also factors that you only see more or less from the outside. Financial injections from the family have also been mentioned enough.
From the generation above us (yeah, yeah, the situation was different back then bla bla) I also know a lot of situations where not everything went 100% smoothly. It starts with "the landscaping still looks like nothing five years later," goes on with "when kids 1/2 were there, there was basically no money left," and also includes things like the family who said "we'll do it bit by bit after moving in" and after 10 years they were still nowhere near where they wanted to be, and then there's also not to forget the couple who separated a year after moving in because they wore each other down. These are all real examples of people I know personally (extended family, or close friends of my parents and in-laws), so no hearsay from acquaintances of acquaintances or anything like that. Of course, there are also plenty where everything goes smoothly, but often there are compromises here and there that you make. You just don’t always see them right away from the outside.
Sounds all pretty terrible now, but on the other hand: they still found their happiness. That's what I mean by "The perfect time never really exists anyway, life just has its obstacles." Of course, no one should jump headfirst into their doom (there are one or two where I had that feeling ;)), so the warning about risks and tight spots is definitely appropriate and you can definitely look for ways to minimize them. But you can also decide to build despite the risks. Recently there was also a comment somewhere here along the lines of "I deliberately didn’t put the financing up for discussion back then because everyone would have argued against it." The forum here generally tends to be more on the safety-oriented side when it comes to recommendations. (But I prefer that over “yeah yeah, definitely go for it!” when the gut feeling says “tight pants”)