We have an appointment with the expert tomorrow and he says it costs about 450 euros, depending on how complex the construction project is. But he said he can also give us some tips, hope it brings more than just filling out the application... I can report tomorrow...
.... depending on how complex the construction project is.
He is completely right here. There is no standard flat rate because every construction project is individual. There are small buildings with quite extensive, complicated geometry (more complex), as well as large ones that are kept fairly simple and clear (more economical).
....But he said that he can also give us some tips, hope it brings more than just filling out the application...
It should. Since he is already at it, he should take care of the basic evaluation at the same time. Overall, that usually ends up being more economical.
With us, it cost €350 massive construction without basement and controlled residential ventilation with exposed roof truss. 250 sqm heated and 65 sqm unheated.