Residential Ground Stability Reports
Ground Stability risks such as sinkholes and subsidence are becoming increasingly more common in the UK, and can be linked both to climate change and to external factors such as human influences.
The British Geological Survey (BGS) estimate that 1 in 5 homes in the UK are at risk of shrink/swell subsidence, highlighting the importance of awareness of the subsidence risk when purchasing a property. According to Property Assure, over 60% of all subsidence claims are caused by trees and vegetation, with 15-20% resulting from leaking drains and pipes and the remainder caused by man-made triggers such as building work to or adjacent to a property.
WITH CHANGING RAINFALL AND GROUND WATER CONDITIONS THERE HAS BEEN A DRAMATIC UPTURN IN THE NUMBER OF CASES OF GROUND COLLAPSING THROUGH NATURAL CAUSES.
RESIDENTIAL ENVIRONMENTAL REPORTS
Full Ground Stability data, including exclusive Property Assure Subsidence risk claims data by postcode is available in all Premium, Standard and the standalone Ground Stability reports.
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be relied upon by the professional parties involved in the property
transaction, including the first purchasers and their advisers,
and the first purchaser’s lender.
WHY CHECKING GROUND STABILITY RISK IS IMPORTANT
Significant areas of the UK are at risk from subsidence. The obvious culprit is coal mining, but there are also tin mines, and many other minerals such as gypsum, salt, and anhydrite that have been mined or are being mined across the country.
On a development of brand new homes in Hemel Hempstead, buyers were pulling out after a 20 foot deep cavity opened up caused by former chalk mines and clay pits. In High Wycombe, a car was swallowed up by a 30 foot hole in a driveway, thought to be associated with old chalk mine workings.
There are many potential causes of ground instability. As well as mining, there can also be natural causes of subsidence, and these can be made worse by the impact of climate change. For example, clay shrinkage is the main cause of subsidence in the UK and reportedly accounts for 75% of subsidence insurance claims. Clay shrinkage is caused by variations in the moisture content of the clay subsoil (frequently affected by trees taking water out of the ground, or leaking drains) resulting in volume changes, which in turn affects foundations and can result in significant subsidence damage.
With changing rainfall and ground water conditions there has been a dramatic upturn in the number of cases of ground collapsing through natural causes known as sinkholes. Large areas of the country are underlain by surface deposits or rock formations such as limestone, chalk, salt, and gypsum. These types of rocks can be removed or readily dissolved by surface flooding, heavy rainfall, leakage from water utilities or changes to the way which water drains into the ground, or by drought conditions removing the support of water in underground cavities. At least 32,000 naturally occurring holes and 15,000 non-coal mines or pits exist in the UK according to Dr Clive Edmonds, a geo-technical engineer for Peter Brett Associates.
Homebuyers should look to protect themselves from this increasing risk and Future Climate Info Premium, Standard and standalone Ground Stability reports provide analysis of all the relevant data sets.