Benching is a less costly and quicker way to create more space in your basement. It involves digging down to the depth you wish your new foundation floor to be and creating new walls to extend from the new depth up to the existing. This new wall has to be reinforced and has a cap – which creates a bench-like structure around your new foundation floor. You can use the new wall to create book cases, shelves or add cupboards for storage. This method is good if what you need to do is create useable space to free up space elsewhere in your home. It does add living space but not quite as much as the underpinning method.

However, benching may be the solution depending on the soil conditions around your home, the nearness of your neighbour’s home, the sewage system your home uses, your budget or the schedule in which you want to have the work completed. - https://www.citywidegroup.com/blog/underpinning-vs-benching

foudation bench footing - https://www.citywidegroup.com/images/b/8/3/2/3/b83234b6d6de8...