Take your time and above all, don’t let yourselves be ripped off. The setup that is a tied selling arrangement is definitely designed for naive builders. And you don’t want to be that.
Watch out for what needs to be done by the builder’s side, and even if you think you’ve covered everything, the construction performance description will take money out of your pocket; anything not included costs extra. For example, there are simply doors, white windows, no sliding elements, one light switch and three sockets per room.
Another example.
Store soil on the side and excavation up to 30 cm foundation.
Sounds harmless but this sentence will cost you 40,000 Euros for this property, if you’re lucky.
Or connections up to the basement wall included. But what about the garden up to the street? The plot is connected even if it’s 20 meters to the house.