One visible sign that your building needs underpinning is the appearance of cracks in walls. When a building needs a foundation repair some cracks (especially wider than ¼ inch) appear visible, meaning that an underpinning needs to be done. Here at GCB we specialise in this service, utilising a number of techniques dependant on requirements. If you think you many need underpinning call as soon as possible to arrange an inspection. Once completed some underpinned foundation repairs are completely undetectable, with wall cracks and roof damage returned to good as new condition.