Concerns are growing over an increase in tree-related subsidence following this year's prolonged hot and dry weather, with homeowners being urged to seek expert advice before removing trees. Sustainable solutions are often available that can help protect properties while preserving valuable green spaces.

Following this year's prolonged hot and dry weather, Mainmark UK is anticipating an increase in tree-related subsidence cases, particularly in areas with shrinkable clay soils.

Recent figures from the Association of British Insurers (ABI) show that the average subsidence claim has reached a record £20,000, with insurers paying out £72 million during the second quarter of 2026.

Tree-related subsidence occurs when roots draw moisture from the ground faster than it can be replenished, causing clay soils to shrink and move. Common warning signs include cracked walls, sloping floors, and doors or windows that begin to stick. Properties in London, the Home Counties, Essex and the South East are among those most at risk due to the prevalence of clay-rich soils.

Freya Chapman, Residential Lead at Mainmark UK, said:

"Following this year's hotter months, we are anticipating a significant surge in tree-related subsidence. Tree roots can extract water from the soil faster than it can be replaced during dry periods, causing clay soils to shrink and foundations to become vulnerable to movement.

As wetter conditions return, removing trees can lead to further problems as clay soils recover moisture and expand, potentially causing ground heave. That's why homeowners should always seek expert advice before taking action."

While trees can contribute to subsidence in some circumstances, they also play a vital role in supporting biodiversity, improving air quality and helping to cool urban environments. As a result, Mainmark UK is encouraging homeowners to consider sustainable mitigation measures before opting for tree removal.

Solutions such as copper root barriers can redirect root growth away from properties without damaging trees, while engineered resin injection can strengthen the ground beneath foundations by compacting weak soils, filling voids and improving support.

Freya added:

"We need to better educate homeowners on the sustainable treatment of trees causing subsidence. Modern technologies enable us to protect homes, preserve established trees and minimise disruption for homeowners."

Mainmark UK recently completed a residential project in Wales where four large trees had contributed to long-standing movement affecting a bungalow. By installing a copper root barrier and carrying out targeted resin injection, the issue was successfully addressed within hours, helping protect the property from further movement while retaining the surrounding trees.

As a member of the Subsidence Forum Committee, Mainmark UK works alongside arborists, insurers and civil engineers to promote sustainable approaches to subsidence management and the development of innovative root barrier technologies.

Homeowners concerned about signs of subsidence are encouraged to seek a professional assessment early, as prompt intervention can help prevent further damage and reduce repair costs.