An increasing number of homeowners are concerned that tree roots could be affecting the foundations of their properties. Part of the worry stems from the fact that rectifying such damage can be expensive and insurance companies are unlikely to foot the bill unless you can prove that the incident was weather-related or the result of faulty machinery or equipment (which is virtually impossible).

We’ve all seen the media stories where tree roots have been responsible for catastrophic damage to property foundations but the truth is these incidents are few and far between. Tree roots can affect soil composition and inadvertently damage foundations through subsidence but usually the problem can be resolved before you’re left homeless.

Subsidence is the term used to describe movement in the foundations of a property. In areas where there is a higher concentration of clay in the soil, long periods of hot weather can cause the water levels in the soil to drop resulting in structural movement. Trees and bush roots can also unsettle the soil, especially in these clay areas and particularly where foundations are inadequate.

Environmental and property specialist Landmark Information Group says more than 60% of subsidence claims are the result of tree roots in clay soil. This is because trees absorb moisture from the soil during growth and this can cause soil shrinkage. It is estimated that a mature deciduous tree can soak up more than 50,000 litres of water every year. Great care needs to be taken during any garden landscape planning or new building projects to ensure that trees are not able to influence foundations. Older trees which have not caused previous damage to a building are less likely to do so in the future while younger trees which are growing rapidly could present more of an issue. A lot also depends on the species of tree – the oak, for example, can reach a depth of several metres and drain more moisture than other varieties.

In most cases where tree roots have influenced subsidence, the tree is within 16ft of the building or on soils prone to movement so as long as you plant a safe distance from your property, you’re unlikely to be affected.

It’s always a good idea to contact a qualified tree surgeon if you’re unsure of whether a tree is affecting your property or if you are planning on planting new trees. Their knowledge will help you make the best choices when it comes to tackling tree root damage or choosing the right species for your soil.

Here at Prince Tree Surgery, we advise on all aspects of tree work including situations where tree roots are suspected of causing subsidence. In some cases, we will work alongside structural engineers and surveyors to carry out a thorough assessment of the root damage and devise an action plan.