Very long story short, we're having a loft conversion. We're using a loft conversion company who asked us to get a structural engineer's report on the party wall before going ahead. After saying it would be completely fine for weeks, the engineer said the calculations hadn't come out as well as he expected and we'd have to underpin the wall. Everything I've read says it is extremely unusual to need to underpin for a loft conversion and we wonder whether the engineer is being over-cautious. Does anyone know anything about this stuff? Questions coming up in next post...