I don't believe your numbers are even close to being correct. 129,000 turnkey. You won’t even get that from the providers you mentioned. If yes, then you'll have 80,000 incidental building costs on top. You can make anything look good on paper. I bet that if the price is actually correct, everything is missing: foundation slab, rent for container and porta potty, delivery, road closure, crane rental, craftsmen travel, construction electricity, construction water. And I’m sure all of that will have hefty surcharges, so in the end you’ll probably end up at 200,000 € just for the house. In addition, there are the 35,000 € incidental building costs that the building expert posts five times a day, and what the earthworks will cost you extra. A carport for 2,500 € is also a neat DIY store number. Then you add a few bucks for glaze, then the foundations, and the price rises quickly. For the price you mentioned, back then we were offered at most a shell house. Even the unreliable newspaper ads here are much higher than 129,000 €. When did your father-in-law build? And how much did he do himself?