From my experience, I can tell you that building a 140m2 house, without a basement, without extras, will cost about €380,000 according to the construction contract. Unfortunately, on top of the pure construction costs, there will be another €100,000 for things like earthworks, garden, construction power, house connections, adjustments to our existing house, etc., so the whole thing will end up costing about €480,000, and there is really no luxury included. During the first conversation with the construction company, I was really blown away when I saw the price.