For something like that, you also plan a buffer. You can't see everything at the beginning, and that's a good thing when you can and may make decisions little by little :)
That's how we see it too, and as a long-time reader and after some: we build, no we don't, oh yes - now a multi-family house -, oh no rather not, oh we build after all.. I have still gained a lot of input here. Among other things, the so-called buffer, which allows you to make some spontaneous decisions without it tearing a huge hole in the budget.
As a common saying, the "conviction" that you only build once is still very much alive,
Yes absolutely! Everyone who talks to us about it and for example asks if we have planned this or that, adds "you only build once anyway". Personally, I only actually know people who either have never built before or are doing it for the first time :)
Of course, you don't know everything beforehand. We will certainly still decide on some things spontaneously, but I have really tried so that it then
I am very happy for you that it works out for you that way or that you were able to determine/research many costs for yourselves in advance.
The large numbers worried us at first, etc., then we jumped on the train that the standard of the general contractor would be sufficient for us (just as we had seen with friends who also built with the general contractor). But on closer inspection, we realized that we would like it differently after all.
I can only repeat myself, we practically planned the buffers and therefore remain financially unchanged.