I just went through my building application documents from the architect.
97€/m3 of built-up space for the garage are specified. (rohnau)
I was just slightly above that with my own work.
It was due to the brickwork, otherwise it would have fit.
For the house, we were at 394€/m3 shell construction + interior finishing invoice group 300+400.
It would have worked if we hadn’t spent another 40-50 grand on appropriate interior furnishings (masonry stove, lift-and-slide door, 2.60m high entrance portal, 180 sockets, 16 cameras, partly exposed stone walls inside, etc. etc.).
If I hadn’t done most of it myself and/or outsourced it, we would have definitely been over budget by 100%. This way it’s okay, roughly 1400€/m2 + additional construction costs + land.
However, that was also 18 months of hard work + contacts + construction machines available from private sources. That should be mentioned.