Subsidence is one of the home insurance problems that can turn a small crack into a much bigger financial worry. It happens when the ground beneath a property sinks and pulls the foundations down with it. In the UK, the risk can be higher in areas with shrinkable clay soil, during prolonged dry weather, or where thirsty trees and shrubs are close to foundations. Standard buildings insurance will usually include cover for damage caused by subsidence, heave and landslip, but the detail matters.
Association of British Insurers figures show the average household subsidence claim in the first quarter of 2026 was £17,820. That does not mean every crack will lead to a five-figure repair bill, but it shows why understanding your policy before a problem appears is worthwhile.
What subsidence cover usually includes
Subsidence cover normally sits within buildings insurance rather than contents insurance. It is intended to cover insured damage to the structure of your home caused by downward ground movement. Policies commonly also cover heave, where the ground moves upward, and landslip, where ground moves down a slope.
If a claim is accepted, the insurer may appoint surveyors, engineers or loss adjusters. The process can include monitoring cracks, investigating drains, assessing nearby vegetation and identifying the cause before repairs begin. Underpinning is sometimes associated with subsidence claims UK homeowners hear about, but it is generally used only when other measures cannot stabilise the property.
If the home becomes uninhabitable because of insured damage, buildings insurance may also provide alternative accommodation, subject to policy limits.
What may not be covered
Subsidence insurance does not pay for every crack or form of ground movement. Common exclusions or restrictions can include normal settlement, wear and tear, defective design or poor workmanship, and damage that was already present or known about before the policy began.
Damage to patios, driveways, garden walls, fences or gates is commonly excluded when those areas are damaged on their own. Some policies may cover them when the same event also damages the insured home or outbuilding, so check the wording.
Coal-mining subsidence is handled differently. Damage caused by coal mining is generally dealt with through the Mining Remediation Authority rather than as an ordinary home insurance claim. If the cause is uncertain, contact your insurer first.
How to recognise warning signs
Cracks are the sign most people notice, but not all cracks mean subsidence. Fine, uniform hairline cracks can appear because plaster dries, buildings move with temperature and humidity, or newer structures settle. More concerning cracks tend to be new, progressive or wider than ordinary decorative cracking.
Signs worth investigating
Warning signs can include diagonal cracks around doors and windows, cracks wider at one end, doors or windows that suddenly stick, wallpaper tearing without an obvious damp problem, or cracks visible inside and outside in corresponding positions. A cracked walls insurance claim should not be assumed to be subsidence until the cause has been assessed.
A practical step is to photograph a suspicious crack with a ruler beside it and date the image. Repeat the photograph after several weeks. This does not replace a survey, but it creates a useful record of whether the crack appears to be changing.
Why clay soil and trees matter
Clay soil subsidence is a concern because some clay soils shrink as they dry and swell when moisture returns. Long periods of hot, dry weather can increase movement. Trees and large shrubs can add to the problem by drawing moisture from soil near foundations.
Do not automatically remove a nearby tree. Cutting down or heavily pruning trees without professional advice can create different ground-movement risks. If vegetation may be involved, speak to your insurer and consider advice from a qualified arboricultural professional.
How much is the subsidence excess?
The home insurance excess for subsidence is often much higher than the standard excess for other buildings claims. The ABI says many policies have a subsidence excess of around £1,000, although it can be higher, particularly where the property has a previous history of movement.
Check the policy schedule rather than relying on the general excess shown on a comparison site. A policy might have a £250 standard buildings excess but a separate £1,000 or higher subsidence excess.
What happens after you report a claim?
Contact your insurer as soon as you reasonably suspect serious movement. Avoid major structural repairs before the insurer has assessed the problem unless emergency work is needed to make the property safe. The insurer may arrange an inspection and, if necessary, monitor the building to determine whether movement is continuing.
The solution depends on the cause. Repairs may involve fixing leaking drains, managing vegetation, repairing masonry after movement has stopped, or strengthening foundations in more serious cases. Subsidence claims can take months because dealing with the cause is usually more important than simply filling visible cracks.
How a previous subsidence claim affects future insurance
A previous claim can make insurance more expensive or reduce the number of insurers willing to quote. The excess may also be higher. However, a history of subsidence does not automatically make a home uninsurable. ABI member insurers are encouraged to work with existing customers to maintain cover after repairs, particularly when work has been completed under the insurer’s direction or approval.
If you want to change insurer after a claim, provide accurate information about the history when asked. A specialist broker may help where standard quotes are limited. Keep engineering reports, repair records and correspondence because future insurers, buyers or mortgage lenders may ask what happened and how it was resolved.
FAQ
Does home insurance cover cracks caused by subsidence?
Buildings insurance will usually cover insured structural damage caused by subsidence, subject to the policy terms and excess. Cosmetic cracking from normal settlement, drying plaster or wear and tear is not treated the same way.
Is subsidence covered by contents insurance?
Subsidence is primarily a buildings insurance issue because it affects the structure. Contents cover protects belongings, although a combined policy may contain additional provisions if an insured event affects both the building and possessions.
Will making a subsidence claim increase my premium?
It can. Insurers may reassess the property’s risk after a claim, which can affect the premium, excess or terms at renewal. The outcome varies according to the cause, repairs and insurer.
Should I repair cracks before contacting my insurer?
For significant or suspicious movement, contact the insurer first. Decorating over cracks too early can remove useful evidence, and structural repairs carried out without agreement may complicate the claim.
Know the cover before you need it
Subsidence cover can protect homeowners from expensive structural damage, but it comes with specific conditions, exclusions and usually a higher excess. Check your buildings policy for the subsidence excess, treatment of outbuildings and external areas, alternative accommodation limits and any special terms linked to previous movement. If new cracks appear and concern you, document them and contact the insurer early. Clear records and early investigation can make a complex claim easier to manage.
