Nice that it’s working out for you. But I’m with the others on this, don’t underestimate the costs. And it’s best to calculate everything completely, including things you could theoretically do later like [Carport], [Gartenhaus], [Garten] in general. Because that will add quite a bit of cost on top of the house construction. And if necessary, you can always use the [Carport] as a buffer ;) Regarding the basement, I’m also skeptical. I don’t remember your budget exactly, but for 150 sqm it wasn’t that generous. Even with friendship prices and your own work, I rather don’t see a basement there. Better to plan for a big [Gartenhaus] and an attic, that’s significantly cheaper.