Underpinning is a method used to increase foundation depth or repairing faulty foundations. This might be the case if you plan to add stories to an existing building or when the foundation has been injured. One visible sign that your building needs underpinning is when cracks are visible. Underpinning Melbourne -provide expert Home Underpinning & Foundation repairs Specialist. Foundation underpinning is an option to treating the soil. Foundation underpinning techniques bypass the problem soils by installing structural elements to transfer the building’s load to underlying competent soils or bedrock.