Piling is a method that builders use widely to lay a deep foundation for structures such as homes.
Underpinning is a method in which you strengthen and reinforce a building base, which, if no action has been taken, can potentially be harmful.
A basement or cellar is one or more floors below the ground floor of a building.
are the parts of a construction project that are needed to enable the permanent works to be built. Usually the TW are removed after use - eg access scaffolds, props, shoring, excavation support, falsework and formwork, etc