Underpinning strengthens an existing structure's foundation by digging boxes by hand underneath and sequentially pouring concrete in a strategic order. The result is a foundation built underneath the existing foundation. Heavy machinery is rarely needed in this method due to the small size of the boxes being dug. Digging will be performed in sequence and will be followed by filling these with concrete, and by steel reinforcements if the design demands. The work is done by hand due to the small, dug boxes so can be labour intensive. As mini piling contractors and cfa piling contractors we design and install all types of foundations and can advise of the safest and most economical solution for your project.