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In construction, underpinning is the process of strengthening and stabilizing the foundation of an existing building or other structure. Underpinning may be needed for a many of reasons:

  • The original foundation is not strong or stable enough.
  • The usage of the building has changed.
  • The type of soil supporting the foundation may have changed (possibly through subsidence) or were misjudged during planning.
  • The construction of nearby structures causes the excavation of soil supporting existing foundations.
  • It is more economical, due to land price or otherwise, to work on the current structure's foundation than to build a new one.