Hello,
so don’t let yourself be pressured by short-term offers. With those companies, I would even consider whether I want to build with them at all...
My opinion: one year for planning is a minimum. We ourselves are already in the middle of construction, and we also had a certain time pressure. But when I think back now, with everything I know now, I wish I had known much earlier in life that I would build someday and that I could have spent much more time on it. You don’t build that often in life, and there are so many possibilities.
Besides, it would be less stressful than having to deal with all subtopics at the same time in a short period; as a layperson, you really have no clue about anything. With some topics, I eventually gave up and said, this must be enough now; with what I know and the alternatives I have found, I will now make a decision.
Well, you surely know the following saying: The first house you build is for the enemy, the second for the friend, and the third for yourself...
I think with a lot of research on the first house, we already reached the friend level, but with more time we might have reached the self level. D