I also come from the metal industry and can understand your frustration. We have never dared to treat one of our customers the way companies fool builders. On construction sites, only botching and lying according to metal standards happens. If a craftsman speaks up about a justified defect found by the builder, he will lie. As an engineer in planning, I always tell myself that this must be how it is with craftsmen—they simply can’t think ahead. What is done right usually makes up 80-90% of the whole and the whole thing would get about a grade 2 in school grading. But it lacks that certain "finishing touch" that would really make the product good. As a turner, it’s like using a normal drill H7 instead of a reamer H7. The minimum requirement in construction is always that the thing is technically flawless. That means the vapor barrier is airtight, the windows are tight, and rainwater from outside can drain properly, etc. Then comes the visual aspect, which most builders complain about. For example, your crooked downpipe, which is not great just visually. It can be easily fixed here, but don’t believe that anyone will close the hole in the plaster properly without a request. Because thinking ahead is simply not there and the craftsmen don’t care either. I had to complain and have a leaking spot fixed 3 times at the carport. I don’t know if it is tight so far because it hasn’t rained again yet. Cross braces 60 cm long have the glued wood wedge joint 5 cm before the end of the wood. That could also be done better or at least mounted where you don’t see it as much. Instead, the part hangs exactly in the visible area of the covered terrace. That’s exactly what I mean by not thinking ahead. "They’re just craftsmen," is what is always said... furthermore, the builder is just a stupid customer and usually doesn’t come back. In the metal sector, you have only a handful of customers and they always come back—if the quality is right. In construction, this rarely happens, or have you already planned a second house? Relatives warn etc.? The others are no better either... after a few months you no longer see some visual things so critically, they “fade into the background.” Technically, of course, everything must be flawless and especially with sealing issues (water damage is bad), you really have to be picky. But an assessor’s statement “in 2-3 years everything will be black” is not a sound statement. Why, how, what reason? You can claim a lot. Either it’s already not tight now and won’t last 2 days (because water runs out of the sockets on the ground floor) or it fits. Floor-level shower things with tiles are a mega special case anyway.