What Is Subsidence?
Subsidence occurs when the ground supporting a building’s foundations moves or changes, causing the foundations to sink or shift.
It is different from normal settlement, which generally occurs as a property naturally settles after construction.
Subsidence can have several causes. One of the most common is shrinkable clay soil. During prolonged periods of dry weather, clay can lose moisture and shrink. Tree and plant roots can also draw moisture from the ground, potentially contributing to soil shrinkage and movement.
Another possible cause is leaking or damaged drainage and water pipes. Water escaping into the ground can soften or wash away supporting soil, particularly where the ground contains sand, gravel or other susceptible materials.
Historic mining activity can also cause ground movement where old tunnels or mine workings collapse or deteriorate over time.
Because the cause is not always obvious, professional investigation is essential before deciding how the problem should be repaired.
Recognising the Warning Signs
The earlier potential subsidence is identified, the easier it can be to understand and manage the problem.
Homeowners should look out for:
How we can help?
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Professional Structural Assessment
The first step is understanding exactly what is happening.
A professional assessment may involve inspecting internal and external cracks, measuring movement, examining the building and investigating potential causes beneath or around the property.
Depending on the circumstances, further investigations may include soil testing, drainage investigations and monitoring of cracks or movement over time.
In some cases, monitoring may be required for several months before a definitive repair solution can be recommended. Understanding whether movement is ongoing, seasonal or stabilising can be critical when deciding on the correct remedial approach.
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Identifying the Cause
There is no single solution to subsidence.
Our focus is on identifying the underlying cause rather than simply treating the visible symptoms.
Potential causes can include:
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Insurance and Claim Support
Subsidence can be expensive, which is why understanding your buildings insurance cover is extremely important.
Where a property is covered for subsidence, the insurer will generally appoint or approve specialists to investigate the claim and determine what remedial works are appropriate.
Our team can help homeowners navigate this process, communicate with relevant parties and ensure that the investigation and repair requirements are clearly understood.
Depending on the circumstances and insurance arrangements, professional support can include liaising with insurers, loss adjusters, engineers and contractors throughout the claim.
Where alternative accommodation is required during major works, this may also form part of the wider insurance process, subject to the terms of the individual policy.
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Remedial Works
The correct repair depends entirely on the cause and severity of the movement.
For example, if leaking drainage is responsible for washing away supporting soil, repairing the defective pipework may be sufficient to stabilise the property.
Where trees are contributing to soil shrinkage, specialist advice may determine whether pruning, removal or another solution is appropriate.
In more serious cases, structural remedial works may be necessary.
Tree Roots and Subsidence
Trees are frequently associated with subsidence, particularly where properties are built on shrinkable clay soils.
Tree roots can draw significant amounts of moisture from the surrounding soil. During prolonged dry conditions, this can contribute to clay shrinkage and ground movement.
However, removing a tree is not automatically the correct solution.
In some circumstances, removing a mature tree can cause the soil to rehydrate and swell, potentially creating a different type of ground movement. For this reason, decisions about tree removal or pruning should be based on professional assessment rather than assumption.
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Drainage and Pipework
Damaged drainage is another important potential cause of subsidence.
A leaking drain can allow water to escape into the surrounding ground, potentially washing away or weakening the soil supporting the foundations.
Where drainage is identified as the cause, the solution can sometimes be considerably less intrusive than underpinning.
Repairing or replacing defective pipework may allow the ground to stabilise without the need for major structural intervention.
When Is Underpinning Necessary?
Underpinning is often the first thing homeowners think about when they hear the word “subsidence”.
However, underpinning is not automatically required.
It is a significant structural intervention that strengthens or extends the foundations of a building. Depending on the property and the extent of movement, it can be expensive, disruptive and time-consuming.
Professional guidance generally recommends that underpinning should only be considered where it is genuinely necessary and where other appropriate solutions cannot adequately resolve the problem.
In some cases, addressing the underlying cause — such as repairing defective drainage or dealing appropriately with vegetation — may be enough to stabilise the property.
Our priority is therefore to identify the most appropriate and proportionate solution, rather than automatically choosing the most invasive one.
The Financial Impact of Subsidence
Subsidence can have significant financial consequences.
Recent UK insurance industry data has highlighted the increasing cost of subsidence claims, with average claim values reaching around £20,000 in recent periods.
However, the actual cost of resolving subsidence varies considerably. Minor remedial works may cost hundreds or several thousand pounds, while major structural repairs and underpinning can run into tens of thousands of pounds.
Homeowners should also consider their insurance excess. Many buildings insurance policies include a specific subsidence excess, commonly around £1,000, although the exact amount depends on the individual policy.
This is why early professional investigation can be valuable. Establishing the cause before unnecessary works are undertaken can help prevent homeowners from spending money on inappropriate repairs.
How Subsidence Can Affect Property Value
Subsidence can also affect a property’s marketability.
A property with active, unresolved subsidence may be more difficult to sell or mortgage, and buyers may be concerned about future repair costs and insurance availability.
Once the issue has been professionally investigated and appropriately repaired, keeping comprehensive documentation is extremely important.
Reports, structural assessments, guarantees, certificates and details of completed remedial works can help demonstrate to future buyers, lenders and insurers that the problem has been properly addressed.
The long-term impact on value varies from property to property and depends on factors such as the severity of the movement, the repair history, location, documentation and the current insurance position.
Why Choose Our Subsidence Services?
Subsidence is not simply a problem with a wall crack. It can involve structural engineering, ground conditions, drainage, trees, insurance and specialist remedial works.
That is why homeowners benefit from working with a company that understands the complete process.
Don’t Ignore the Warning Signs
If you have noticed new cracks, sticking doors or windows, uneven floors or other unexplained changes to your property, don’t automatically assume that the problem is serious — but don’t ignore it either.
Early investigation can help establish what is actually happening and whether the issue is related to subsidence, another form of movement or a relatively minor building defect.
The sooner the cause is understood, the sooner the appropriate solution can be considered.
