Subsidence Claims Surge 140%: What Homeowners Must Know

What Has Happened?

The summer of 2026 will go down in the record books — and not just for the barbecues. Following the warmest spring ever recorded in England and Wales, Britain endured five heatwaves between June and August, culminating in what the Met Office has confirmed as the hottest summer on record for the UK.

The financial consequences of that heat are now becoming painfully clear for homeowners. Insurers across England and Wales are reporting an unprecedented surge in subsidence claims. Hastings Direct — one of the UK's major home insurers — has reported a near-140% jump in subsidence claims in August alone, reaching an all-time high for the company. Other insurers have reported being similarly overwhelmed, with call centres and online claim portals inundated by worried homeowners.

This is not a minor statistical blip. A 140% increase means that for every one subsidence claim Hastings processed in a typical August, it is now handling close to two and a half. Multiply that across the entire UK home insurance market and the scale of the problem becomes significant.

Why Does Hot Weather Cause Subsidence?

Subsidence occurs when the ground beneath a property shifts or sinks, causing the building's foundations to move unevenly. This leads to structural damage — most visibly in the form of cracks in walls, sticking doors and windows, and uneven floors.

The connection to hot weather lies primarily in the soil. Large parts of England — particularly London, the South East, East Anglia, and the East Midlands — are built on clay-rich soil. Clay is highly sensitive to moisture levels: it swells when wet and, critically, shrinks and cracks when it dries out. Prolonged heat and drought cause this clay to contract dramatically, removing the stable support that foundations depend on.

Large trees and hedgerows close to a property compound the problem further. During dry spells, their roots reach deeper in search of moisture, extracting water from the soil and accelerating shrinkage. This is why properties with mature trees nearby — particularly willows, oaks, and poplars — are considered higher risk by insurers.

Who Is Most at Risk?

Not every UK homeowner faces the same level of risk. The following groups should be paying particularly close attention right now:

• Homeowners in London, the South East, East Anglia, and the East Midlands — these regions sit predominantly on shrinkable clay soils and have seen some of the most extreme temperatures this summer.
• Owners of older properties — homes built before the 1950s typically have shallower foundations, making them more vulnerable to soil movement.
• Properties near large or mature trees — particularly those within 10 metres of the building.
• Homes that have experienced subsidence before — previous movement makes future movement more likely, and your insurer will already be aware of this history.
• Leasehold flat owners — while the freeholder is usually responsible for buildings insurance, you should check that adequate cover is in place and that subsidence is not excluded.

How to Spot the Warning Signs

Subsidence does not always announce itself with dramatic collapses. In many cases, it begins with subtle signs that are easy to dismiss. Now is the time to do a careful walk-around inspection of your property, inside and out. Look for:

• Diagonal cracks — particularly those wider than 3mm, tapering in shape, and appearing at the corners of windows and doors
• Doors and windows that suddenly stick or no longer close properly, without an obvious explanation such as damp or swelling
• Cracks that appear suddenly or grow noticeably over a short period
• Visible gaps between walls and the ceiling, floor, or extension joins
• Wallpaper wrinkling at the joins between walls and ceiling, which can sometimes indicate movement rather than damp

If you notice any of these signs, do not simply fill and paint over cracks. Document them with photographs and dates, and contact your insurer promptly.

What Should You Do If You Suspect Subsidence?

Acting quickly — but carefully — is important. Here is a straightforward process to follow:

• Photograph everything — date-stamped photos are invaluable evidence for your insurer and for any future sale of the property.
• Contact your home insurer — report your concerns as soon as possible. Delaying a claim does not make the problem go away and could complicate your position later.
• Ask for a structural survey — your insurer will typically appoint a loss adjuster and may arrange a structural engineer's report at their cost. If you prefer an independent opinion first, hire a chartered surveyor yourself.
• Do not undertake major repair work without insurer approval — unauthorised repairs can invalidate your claim.
• Review your policy excess — subsidence claims often carry a higher excess than standard claims, sometimes £1,000 or more. Make sure you know what you are liable for before proceeding.

The Insurance Implications: What to Watch Out For

Subsidence claims are among the most expensive and complex in home insurance, and they carry long-term consequences for policyholders. Once a subsidence claim is on your record, you are likely to find that:

• Your premiums increase, sometimes substantially, at renewal
• Some mainstream insurers may decline to cover you or add subsidence exclusions to your policy
• You will need to disclose the claim history when selling your property, which can affect buyer confidence and mortgage valuations

If you find yourself unable to obtain affordable cover due to a subsidence history, do not despair. Specialist home insurers exist precisely for higher-risk properties, and an independent financial adviser or insurance broker can help you navigate the market to find appropriate, FCA-regulated cover at a fair price.

The Outlook: Is This Going to Get Worse?

The honest answer is: almost certainly, yes — at least in the short to medium term. Climate scientists have long warned that the UK will experience hotter, drier summers with increasing frequency as a result of climate change. The summer of 2026 may feel like an outlier today, but it is more likely a preview of what future summers will look like.

For the insurance industry, this creates a structural challenge. If subsidence claims continue to rise year after year, insurers will have no choice but to price that risk into premiums — meaning home insurance costs for properties in high-risk areas could rise materially over the coming years. Some analysts have already drawn comparisons with the flood insurance market, where homes in flood-prone areas have seen premiums spiral and cover become harder to obtain.

For homeowners, this underscores the importance of proactive maintenance — managing trees and vegetation near your property, maintaining drainage systems, and monitoring your home's structure regularly — as well as ensuring you have adequate, properly worded cover in place before problems arise.

What This Means For You

The record-breaking summer of 2026 has created a genuine financial risk for millions of UK homeowners, many of whom may not yet realise their property has been affected. Here is what you should do right now:

• Inspect your home today — look for the warning signs of subsidence described above and document anything you find.
• Check your home insurance policy — confirm that subsidence is covered and understand your excess. Not all policies are equal.
• Don't ignore small cracks — monitor them over the coming weeks. Mark the ends with a pencil and date, and see if they grow.
• Manage your garden — if you have large trees close to your property, consult an arborist. In some cases, controlled root management or tree removal (with proper guidance) can reduce long-term risk.
• Speak to an expert if you're struggling with cover — if you're finding home insurance difficult to obtain or afford due to subsidence risk or history, an FCA-regulated financial adviser or broker can help you find specialist cover tailored to your situation.

At Nesto, we can match you with an FCA-regulated financial adviser who understands the home insurance market and can help you review your protection — whether you're dealing with subsidence concerns now or simply want to make sure you're properly covered ahead of future summers. Don't wait until the cracks appear.