Cost of extension - two floors with terrace

hi everyone, we would like to build an extension to our house. the idea is as follows. not basemented about 4x7m in size two floors and the roof should become a terrace is this actually possible? to use the roof as a terrace? and what costs can I expect. thank you for the tips micha

Thanks to a thousand unknowns something between 30,000 - 1,000,000€

I just calculated it: €72,317.62 :p

Damn, I should get myself a newer crystal ball too. :rolleyes: