THOUSANDS of households are being warned over a "devastating" issue that could knock £56,000 off their home's value this summer.
Subsidence is where the ground beneath a building sinks, pulling the home's foundations down with it and causing significant damage to its structure.
It can be "devastating" and cost "vast amounts of money" to put right, according to property firm Parkers Properties, and households can be left with higher insurance premiums long-term too.
And if you don't fork out to fix it, it could wipe tens of thousands of pounds off your home's value, according to brokers.
Insurers paid around £219million in subsidence claims in 2022, according to the Association of British Insurers (ABI).
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This was the highest annual subsidence payout in 16 years since 2006, with the average claim standing at £9,600.
Of the 23,000 subsidence claims made during the year, the majority - 18,000 - were in the second half of the year following a summer heatwave.
This is because hot weather can cause the ground beneath a property to lose moisture and contract, which causes foundations to sink.
With the peak of summer still to come, homeowners may be worried that their house could be at risk and land them with a huge bill.
Home insurer Homeprotect said it can cost anywhere between £5,000 and £50,000 to protect a property's foundations, depending on the size of the house and the extent of the damage - not a bill you want to end up with.
Homebuyers will typically knock this cost off your house price before buying, brokers explained.
Open Property Group said a subsidence issue could knock around 20% off your home's value, wiping £56,938 off the average house price of £284,691.
"Subsidence is by far the worst [property problem] of the lot and indicates major structural issues that are sure to send potential buyers running for the hills," the property firm said.
Most comprehensive buildings insurance should protect you if your home suffers from subsidence, so it's worth checking your policy protects you - or making sure you have insurance at all, if you don't currently.
Many mortgage lenders require homeowners to have buildings insurance as a condition of their loan.
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How to spot subsidence in your home
The Sun spoke to Liz Hunter, director at Money Expert, who explained how to spot the early signs of subsidence and what homeowners need to do if they find one.
Cracks and issues with windows and doors
The main sign that your property is suffering from subsidence is cracks in the walls, particularly around doors and windows, as they are weak points in a building’s structure.
"These cracks may become bigger and more visible over time, particularly near doors and windows," Liz explained.
"If you find your doors and windows are sticking, becoming difficult to use, or aren’t opening and closing properly then this could be another sign."
Large gaps forming in these areas, rather than cracks, may also signal that the problem is getting worse - and this will cost even more to fix.
Liz said: "These issues shouldn’t be ignored and should be checked by a professional quickly to assess the damage and find a cause.
"If it is subsidence, the key is acting quickly to avoid it becoming worse."
Uneven floors
Another early sign of a building's foundations being pulled down may be suddenly sloping or uneven floors.
Liz said: "You may even notice your walls or ceilings bulging or sagging at the same time.
"If you look outside, you may see outside features such as pavements, patios or decking start to tilt or sink too."
Water marks or issues with wallpaper
If you notice water stains on the walls or ceiling, this could signal subsidence or a leak.
Either way, Liz said you should get it checked out so the problem can be fixed.
"It may mean there are cracks on the exterior walls letting in the rain, which is another early sign of subsidence," she added.
"Check unusual marks on outside walls such as horizontal cracks or crumbly render."
If you notice there’s no damp but your wallpaper is starting to crease or even tear - then this could also be a cause for concern.
Liz said: "If you have checked yourself for signs of damp and see no other reason why the wallpaper may be creasing, then it’s best to contact a professional to check the structure of the building for subsidence."
Property Age
If you live in an older property, there may be a greater risk of subsidence as your home may have shallow foundations.
Liz said: "The foundations may have worn over time or may not have the same quality than a more recently-built home.
"These types of homes will need more regular checks to reduce the risk of subsidence and may even need minor updates or improvements like improving drainage to keep subsidence at bay."
What happens if there is subsidence in your home?
If you spot subsidence in your home, the next steps will vary on a case-by-case basis depending on the cause of the subsidence.
If your insurer provides subsidence cover, they would look to mitigate the cause.
There are usually two causes of subsidence. These are a leaking drain, which could wash away the finer parts of subsoil, or tree roots taking moisture from the clay underneath a building.
Either way, Liz said it's important that you act fast and don't ignore early signs, as leaving it to worsen can lead to to more severe issues for your home that are much more costly to repair.
Once your insurer has established the cause, they will try to repair the subsidence - for example by removing a nearby tree.
In the vast majority of cases this is a simple process, but in a small percentage of more extreme cases you may need to consider more disruptive measures such as underpinning the property.
What impact does claiming for subsidence have on my insurance?
Most insurers will continue to insure a property once it has been repaired for subsidence-related issues, and this work will typically be done through the insurance company.
However, it can be difficult to obtain new cover once you’ve made a subsidence claim on your property, so most customers will need to remain with their current insurer after making a claim.
In some cases, your insurer might agree to a cash settlement rather than repairing the damage themselves, as they may not be able to find the right people to carry out the work.
This means you will need to use the money they give you get to fund your own repair works.
Some insurers might apply conditions to your insurance policy going forward, such as removing cover until the work has been completed.
Subsidence claims can increase your future insurance premiums, though - but there are a number of factors that influence an insurers' decision and it varies from firm to firm.
David Joyson, chief customer officer at Homeprotect, said: "If you suspect subsidence, you’ll firstly want to check your home insurance policy documents to see if it’s covered.
"In the future – particularly if you’re planning to buy a property where the survey shows you may be at risk of subsidence – it would be wise to switch your policy to a specialist home insurer that will cover you for subsidence, ensuring you fully disclose the subsidence risk that has been identified."
Advice for homebuyers
If you’re concerned about subsidence, Liz recommended getting a full structural survey done before you buy your home.
You could also get a structural engineer to take a look if you’re worried.
If a property has ongoing subsidence, it could be difficult to market or sell.
This is because in some cases, where the damage is severe, the property could also be uninsurable, which would impact you or any future buyers' ability to get a mortgage.
It may be worth getting a current homeowner to repair any issues before you buy a property.
Meanwhile, if you're looking to sell a home which has suffered from subsidence, consider getting it repaired before you put it on the market.
Mr Joyson added: "“There’s not much you can do to prevent subsidence, but there are ways to reduce the risk – including removing trees and bushes planted near the house (although always check larger trees aren’t under a tree preservation order) and if you can’t remove them, then maintain them with regular pruning.”
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