A surprising number of properties require underpinning or have at some time been underpinned or suffered from some structural defect. Many people are greatly concerned when underpinning or structural issues are mentioned. They can be resolved for a few hundred pounds but can also run into tens of thousands depending on each individual property and the volume of work involved. So what is under pinning? There are two main types of underpinning used, the first and most common simply involves excavating under the existing footing or wall and providing a new concrete footing. The second is with the use of pile foundations these are holes that are drilled under the footings and filled with concrete and steels and are often connected with a ground beam. Ground beams can either be poured on site or arrive to site pre-cast. The process is simple but there is a high level of skill and experience required to make sure that the work is done correctly, safely and will stand the test of time. This is particularly important when you are dealing with buildings or sections of buildings that are dangerously unstable.