We are building with a regional general contractor using solid construction. Basically, you can also get everything move-in ready there, but it always costs extra.
Current budget is unfortunately hardly available,
The question about the budget is more about how much you ultimately want to spend in total. Depending on that, it can roughly be determined whether your wishes fit your budget.
Not to forget, of course, the ancillary construction costs + outdoor facilities and possibly further needs (kitchen, furniture, lamps, etc. pp)
We have a 389 sqm plot and had to plan for quite a while so that a house (although without a basement) can fit on it and there is still garden space left; that is already a challenge with little space.