Finding a new crack in a wall can make any homeowner uneasy, especially when the word “subsidence” comes to mind. Understanding subsidence cover in home insurance can help you respond without jumping to conclusions. Cracks do not automatically mean the ground beneath your home is moving. UK homes develop cracks for many reasons, including normal settlement, thermal movement, failed lintels and building defects. What matters is identifying the cause early and knowing how your buildings insurance responds if genuine subsidence is confirmed.
What subsidence cover in home insurance usually includes
Subsidence is downward movement of the ground supporting a building, which can pull foundations with it and cause structural damage. Most UK buildings insurance policies include cover for damage caused by subsidence, heave and landslip, although the wording, exclusions and excess vary between insurers.
Subsidence claims commonly carry a much higher excess than an ordinary buildings claim. The Association of British Insurers says many policies have a subsidence excess of around £1,000. That means you may have to pay the first £1,000 of an accepted claim, even if your normal buildings excess is far lower.
Cover is usually focused on the main insured building. Patios, paths, garden walls, fences or driveways may not be covered on their own unless the home is damaged at the same time, so check the policy wording carefully.
Cracks that deserve closer attention
There is no single crack shape that proves subsidence. However, new cracks that continue to widen, diagonal cracking around doors or windows, cracks visible inside and outside in the same area, or doors and windows suddenly becoming difficult to open can justify further investigation.
The key word is change. A small crack that has looked identical for years is different from one that appears after a dry summer and becomes noticeably wider over several weeks. If you are worried, photograph the crack with a ruler or another scale beside it, record the date and repeat the photograph periodically. Avoid filling or redecorating over it before the cause has been assessed.
People sometimes search for “cracked walls insurance” expecting any crack to be insured. In practice, the cause of the damage determines whether a claim is covered. Cracking caused by normal settlement, poor workmanship, defective design or ordinary wear is commonly treated differently from insured subsidence.
Why clay soil and trees matter in parts of the UK
Clay soil can shrink as it dries and swell again as moisture returns. That behaviour helps explain why clay soil subsidence in the UK is a particular concern after prolonged dry weather, especially where mature trees are close to a property. Tree roots can draw moisture from the ground, increasing shrinkage in susceptible soils.
This does not mean a house on clay soil will suffer subsidence, or that a nearby tree should automatically be removed. If vegetation appears relevant, your insurer or engineer may recommend specialist arboricultural advice before action is taken.
What happens when you make a subsidence insurance claim
If you suspect active subsidence, contact your buildings insurer promptly. The insurer may appoint a loss adjuster, surveyor or structural engineer to inspect the property and decide whether the symptoms point to ground movement or another cause.
A subsidence survey or claim investigation can involve more than a visual inspection. Depending on the case, specialists may use trial pits to examine foundations, boreholes to assess the ground, CCTV surveys of nearby drains and crack monitoring to establish whether movement is continuing. The Financial Ombudsman Service notes that some cases may reasonably need monitoring across the seasons, sometimes for around a year, because subsidence can be seasonal.
Repairing decorative cracks before the building has stabilised can simply result in them reopening. Severe cases sometimes need underpinning, but it is not the default outcome for every claim; often the underlying cause is addressed before repairs are completed.
A practical example: what to do when a crack appears
Imagine you notice a diagonal crack above a rear window in August after a long dry spell. The house is in an area known for clay soil and there is a mature tree nearby. Rather than assuming the worst, take clear dated photographs, check whether the crack is visible outside, note whether the window has started sticking and contact your insurer if the change appears significant or progressive.
Do not arrange major structural repairs or remove the tree before speaking to the insurer. Unauthorised work can complicate the investigation and may make it harder to establish the original cause. Keeping a simple timeline of when you first noticed the damage, how it changed and any relevant leaks or drainage problems can also help the claims team.
Why some homes face higher premiums or tighter terms
Insurers price buildings cover using their own risk models. Soil type, local claims history, property construction, nearby vegetation, previous subsidence and other location factors can affect the premium, excess or whether an insurer is willing to offer cover. A postcode associated with higher risk does not automatically mean a property is uninsurable, but the choice of insurers may be narrower.
If a property has previously suffered subsidence, disclose the history accurately when asked. Future insurers may request details of the cause, repairs and any structural reports. Keeping the original subsidence survey, engineer’s report, completion documents and claim correspondence can make later applications much easier.
If mainstream insurers will not quote, a specialist broker may help. For wider protection questions, see our guides to buildings cover, structural damage and home insurance excesses.
Frequently asked questions
Does buildings insurance always cover subsidence?
Most UK buildings policies cover subsidence, but not every type of cracking or ground-related damage is automatically insured. Exclusions, excesses and cover for garages, patios and other structures vary, so check your own policy wording.
How much is the subsidence excess?
A subsidence excess of around £1,000 is common, according to UK insurance industry guidance, but the amount on your policy may be different. Your schedule should state the exact excess that applies.
Should I get my own subsidence survey before contacting my insurer?
You can obtain independent professional advice, but if you may make a claim it is usually sensible to notify the insurer first. The insurer may want to appoint its own surveyor or engineer and can tell you what evidence it needs.
Can a previous subsidence claim make home insurance harder to obtain?
Yes. Some insurers may charge more, impose different terms or decline the risk, while others may still offer cover depending on the cause and repairs. Detailed records of completed remedial work can help when seeking future insurance.
Protect the evidence before you repair the damage
Subsidence is serious when it occurs, but a crack is a symptom rather than a diagnosis. Document changes, check your buildings policy, and involve your insurer before making major repairs. A proper investigation can distinguish insured ground movement from ordinary cracking and identify the right long-term fix. The earlier you preserve evidence and report genuine concerns, the easier it is for everyone involved to understand what has happened and what should happen next.