hi is it feasible to lower the upper purlin by a few feet, my loft has had some issues with woodworm, it has all been treated but we are now thinking about replacing the purlins as they are a bit ropey and then do a loft conversion, but still in the thought process and need the answer before we spend £450 for building regs to tell us we cant move them, if we cant put a new one in lower down before we remove the original then i can start to think about the conversion properly,