What is subsidence?

Subsidence is when a building’s foundation losses support and sinks into the ground.

Its main causes are:

  • Changes in the normal water content of the subsoil under the foundation (particularly clay), due mainly to the effect of trees planted too close to buildings.
  • The makeup of the ground such as man-made, reclaimed land, or peat
  • Poor design or construction of a house or its foundations
  • The house is not designed or built to suit the soil conditions.
  • The location of the site (eg on a steep slope)
Last updated: November 27, 2017

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