Well, I now think that no one has anything to give away for free and that a quality x also has the price x. That you get quality x at price x from developer A is one thing - but I don’t believe you suddenly get a truly comparable quality service from developer B at price y. Profit margins will be calculated the same everywhere. Profit maximization is economical, they have their respective business economists in the necessary departments and if a price from provider b is significantly lower, it will not be because they are generously giving you something. Of course, I am happy to be corrected.
I also find building extremely expensive and if the land already hits hard regionally, as it does with us, I find every attempt to find savings potential only logical. But all research we have done so far always came to the point that a quality x will cost x euros regardless of who you build with. Assuming seriousness.
At least doing painting and flooring work yourself partially or contracting it out yourself will pay off, I consider that very certain now.
Completely contracting out trades yourself, a friend who is an architect strongly advised against that. You need to have VERY much time, you need to know exactly what it’s about (which we usually don’t know from a construction technical point of view), and the risk that in the end you haven’t saved anything and still got badly hit is high.
Then I would rather look at what minimal standard you can live with. Then possibly only the cheapest equipment line will work, which doesn’t have to be wrong, I believe.