For comparison, our offer for a flat roof building with a recessed top floor (165 m²), double garage, no basement, two cantilevers, and 11 m window front:
Approval statics + reinforcement plans
€5800 gross
plus €1200 gross as learning costs for the additional consideration of photovoltaic system and green roof loads, as well as for the change of wall thickness from 17.5 cm to 24 cm brick.
We were surprised and angry that, for example, the loads are apparently not standard and were not specified by us at the beginning. Also that changing the wall thickness entails such an effort.
Note: Define all details from the outset. Hold a coordination meeting after the design statics and document everything in writing!!