Unclear if he would have... I'm asking a bit oddly because, for example, just the difference between a standard interior door A 0815 and interior door B 0915 including the frame can be 100 € – just like that, 4% of the difference is explained. Now it depends on what is stated in the construction specifications – does it say "doors worth 200 €" or "brand XY in version ABC" or "brand doors"? You can run through this with almost all details and every trade. Please make sure all details are specified in the construction specifications so that you can compare. If you do not understand things – and that is to be expected – get advice.