Underpinning information

Understanding the options available if your house needs to be underpinned
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Underpinning information

When you spot cracks appearing in your home, it can be a worrying discovery indeed. No cracks should ever be ignored, but they are not necessarily indications of a subsidence issue. Typically subsidence cracks are tapered in appearance and spread diagonally across your walls, often originating from door or window frames. Subsidence cracks will open quite wide and will not close up naturally on their own. Cracks that close up on their own could be forming as part of your home's seasonal expansion and contraction, and may not be anything to worry about. This said, you should always seek professional advice when you notice any cracks appear.

Is underpinning always necessary?

Underpinning is not always necessary to rectify a subsidence issue, and is increasingly being used only as a last resort. There are a number of other options that might be open to you, depending on the individual circumstances of your subsidence issue. Usually, once you have contacted your underpinned house insurance provider, a period of observation and investigation will commence to diagnose the issue properly. Observations may need to be taken over long periods to make sure that the movement is ongoing, so getting a quick-fix might be out of the question. Consulting engineers may be called in to help determine the best course of action to take in order to rectify any structural issues.

New and old buildings

If your building is new then it is a good idea to consult the builder and ask them to inspect the property, but older properties will not come with this option. There are a number of common causes of subsidence, and there could be additional exacerbating factors. In the South East of England, the clay rich soils mean that clay shrinkage is a likely candidate after extended hot dry periods. This can also be the case elsewhere, but it is particularly rife in areas around the Thames (where it is now and where it used to be historically). Settlement of soft ground can cause subsidence issues, particularly where leaking drains or pipes are an issue. No matter what type of subsidence you encounter, if underpinning is required then you will have to seek out underpinned insurance in the future.

Subsidence issues

Where subsidence issues are being caused or aggravated by tree root incursion, instead of immediate underpinning you may be able to mitigate further damage with careful tree management. Removal of trees completely is not always a good idea, as this can lead to other severe ground movement problems down the line, but you will need to consult a professional arboriculturist or similar before taking action. Sometimes tree pollarding is used to control tree growth and this might be preferable to the invasive and expensive practice of underpinning.


If you have had to have underpinning work carried out in the past, you will need to declare this as a material fact when applying for insurance. Unfortunately, many mainstream insurers will be reluctant or unable to offer you underpinned house insurance, even if the work fixed the ground movement problem. This is not the case with HomeProtect, as we can provide you with a competitive online quote for underpinned insurance based on the risk faced today and not the risk you faced before the problem was fixed.

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Very Helpful, easy to arrange home insurance, particularly for a property that had some higher risks indicated. Would recommend. Wednesday, 11 October 2017