Subsidence Ltd

Tag: subsidence

  • How Much Does Subsidence Devalue a House?

    How Much Does Subsidence Devalue a House?

    If you’re worried about subsidence, one of the first questions is often how it will affect the property’s value. It’s understandable to be concerned about losing money, particularly if you’re planning to sell or remortgage. However, there’s no one-size-fits-all answer. A house with active, unresolved movement is very different from one where the cause has been identified, the repairs have been completed, and clear documentation shows what’s been done.

    The figures you might see quoted online can be a useful starting point, but they shouldn’t be treated as a valuation of your individual property. In our experience at Subsidence Ltd, the building’s condition, the cause of the subsidence, the quality of the repair, and the evidence available to buyers can all influence how much value is actually affected.

    How Much Does Subsidence Devalue a House? Typical Figures

    A commonly quoted figure is that a property with ongoing subsidence can lose around 20–25% of its value, while historic subsidence that has been properly repaired has a much smaller reduction of around 0–5%. However, treat these figures as broad examples rather than a fixed rule. The impact can vary considerably between properties.

    For example, a £400,000 property with active subsidence could theoretically face a much larger devaluation than a similar property where the movement was repaired years ago and supported by clear warranties. The reason is simple: valuers, buyers, and mortgage lenders assess the risk associated with the property, rather than applying a standard “subsidence discount”.

    This is also why you can sell a house with subsidence, but the property’s condition and history will influence the process, potential buyer pool, and the price you can realistically achieve.

    Five Things That Decide How Much Value You Lose

    When assessing the potential impact of subsidence on property value, several factors matter more than a headline percentage.

    1.    Still moving, or finished and fixed?

    The biggest difference is whether the subsidence is still active. Ongoing movement creates uncertainty because a buyer might have to pay for further investigation and repairs after completing. A property where the movement has been properly investigated and treated is a safer purchase, as the buyer can see what caused the problem and whether the foundations have been stabilised.

    2.    What caused it?

    The underlying cause is also important. Subsidence linked to shrinkable clay, tree roots, leaking drains or other ground conditions can have different implications depending on whether the cause has been properly dealt with. A repair that stabilises the foundations without addressing an ongoing cause might not provide the reassurance a buyer or lender needs.

    3.    How bad is the visible damage?

    Not every crack tells the same story. Minor historic cracking differs from significant structural movement accompanied by sticking doors and uneven floors. Valuers and surveyors will consider the extent of the damage rather than simply measuring the widest crack. A property with limited, stable damage might be viewed very differently from one where movement is continuing, and repairs are still required.

    4.    What paperwork can you present?

    Documentation can make a significant difference when selling a property with a history of subsidence. Buyers and mortgage lenders might want to see surveys and reports, details of the repair work, insurance information, and evidence that the underlying problem has been addressed. Having this information available shows what happened and how the problem was dealt with. A written warranty can also provide additional reassurance.

    5.    Can local demand absorb it?

    The local property market has an impact too. A home in a high-demand area might attract buyers despite a history of subsidence, while a property in a slower market might need to be priced more competitively. This doesn’t mean that location cancels out the effect of subsidence. Instead, it can affect negotiating power and how many potential buyers will consider the property.

    Mortgages and Insurance: The Real Drivers of the Drop

    For many buyers, the biggest concern isn’t the crack itself but what subsidence means for getting a mortgage and suitable insurance.

    Mortgage lenders need to be satisfied that the property provides adequate security for the loan. If movement is ongoing or the cause hasn’t been established, a lender may require further structural information before deciding whether to proceed. This can complicate the purchase and potentially reduce the number of buyers who can proceed.

    Insurance can have a similar effect. Subsidence is an expensive type of claim, which is one reason insurers take a property’s history seriously. The Association of British Insurers reported that insurers paid £72 million for domestic subsidence claims in the second quarter of 2026, with the average claim reaching a record £20,000. This is an insurance claim average, not an indication of how much a property will lose in value. However, it demonstrates why subsidence is a significant financial risk.

    It’s therefore worth understanding whether house insurance covers subsidence and keeping copies of any claim information, reports and repair documentation. Having the right paperwork ready can make it easier to answer questions when you come to sell.

    Does a Completed Repair Restore the Value?

    A repair can significantly change the way a property with subsidence is viewed, but it doesn’t necessarily erase its history. The key benefit is that the buyer isn’t purchasing a property with an unexplained structural problem. They can see what caused the movement, what repairs were carried out, and what evidence shows the issue has been addressed.

    The quality and documentation of the repair are key here. A professional assessment, clear engineering information, and a suitable warranty can provide considerably more reassurance than simply filling cracks and redecorating. For example, our 10-year subsidence warranty transfers automatically when a property is sold.

    So, while professional repairs don’t guarantee a full increase in property value, they can give buyers more confidence in the work carried out.

    Repair Cost vs. Value Lost: Doing the Sums Before You Sell

    If you’re considering selling a property with subsidence, it can be tempting to accept a lower offer to avoid dealing with the problem. However, it’s worth comparing the potential reduction in value with the cost of repairing the underlying issue. The cost of subsidence repair varies considerably depending on the cause, the area affected, the ground conditions, and the required treatment, so a professional assessment is needed before providing an accurate quote.

    For some properties, completing the repair before selling makes financial sense as it removes uncertainty and gives prospective buyers evidence that the movement has been addressed. In other cases, particularly when the repair would be extensive, selling the property in its current condition might be the better option. The key is to make the decision using actual figures rather than assumptions. Comparing the likely subsidence repair costs with the potential reduction in the property’s sale price gives you a much clearer basis for deciding what to do.

    If you’re concerned about subsidence and want to understand how it might be affecting your property’s value, we can assess the underlying movement and explain the repair options. Contact Subsidence Ltd to arrange a professional survey and learn what to do next.

  • Is Subsidence Dangerous? Common Safety Risks and When to Get a Professional Survey

    Is Subsidence Dangerous? Common Safety Risks and When to Get a Professional Survey

    If you notice cracks in your walls, doors that are hard to close, or floors that are no longer level, it’s natural to wonder whether your home is unsafe. Subsidence can sound alarming, but not every sign of movement means a property is in immediate danger.

    What’s important is understanding what’s causing the movement, whether it’s continuing and how it’s affecting the overall structure. Some minor cracking can remain stable for years, while ongoing foundation movement can gradually create significant problems if it’s left unchecked.

    Knowing which signs need attention and when a professional survey is best can help you understand what’s happening before deciding whether repairs are necessary.

    Is Subsidence Dangerous? The Short Answer

    Subsidence can become a serious structural problem, but it doesn’t automatically mean your house is unsafe to live in. Subsidence occurs when the ground under a building moves or loses some of its ability to support the foundations. This can happen for several reasons, including shrinkable clay soils, tree roots, and leaking drains.

    The important point is whether the movement is active. A small, stable crack is very different from a crack that’s gradually widening. If you ignore active subsidence, continued ground movement can increase stress on different parts of the building and, over time, make repairs more complicated.

    This is why, at Subsidence Ltd, we recommend assessing the cause rather than assuming a crack is harmless or that the whole property is now unsafe. Recognising the signs of subsidence early gives you a much better understanding of what needs to happen next.

    The Main Safety Risks to Watch For

    The visible signs of subsidence can tell you more than you think. Looking at the pattern of movement and whether several symptoms are occurring together can be beneficial:

    • Cracking in walls – Cracks caused by structural movement can be diagonal or stepped, become wider over time, or appear around vulnerable points, such as extensions. Their location, direction and progression can also be just as important as their width.
    • Jammed doors and windows – If doors or windows become difficult to open or close, movement in the surrounding structure might have distorted the frame. This doesn’t automatically mean subsidence, but it’s worth investigating.
    • Sloping or uneven floors – A noticeably uneven floor can indicate that one part of a property has moved more than another. This is particularly important to assess when it develops alongside cracks in walls or changes around doors and windows.
    • Cracked drains – Ground movement can affect underground drainage, potentially cracking or displacing pipes. Leaking water can then soften or wash away surrounding soil, potentially worsening foundation movement. This means drainage should be considered both as a possible consequence and a contributing factor.
    • Strained gas or water pipes – Significant ground movement can affect buried services as the surrounding ground changes position. These issues shouldn’t automatically be attributed to subsidence, but they show why you need to assess wider ground movement rather than judge the problem from a single visible crack.

    Generally, knowing when to worry about cracks in walls and which characteristics can make a crack more concerning is the first step to identifying dangerous subsidence.

    Urgent or Worth Monitoring? How to Tell the Difference

    One of the most useful things to establish is whether the ground is still moving. A crack’s appearance offers useful information, but the progression can tell you much more.

    For instance, very fine cracks can result from plaster movement, minor settlement or seasonal changes and don’t always indicate a foundation problem. Wider cracks deserve closer attention, particularly when they appear alongside other symptoms. However, no single crack width can diagnose subsidence. A narrow crack that’s actively widening can be more concerning than a wider crack that’s remained unchanged for many years.

    The rate of change is important too. If a crack is getting longer or wider, new cracks are appearing nearby, or doors and windows are becoming increasingly difficult to open, it can indicate ongoing movement. For this reason, we consider the complete pattern. If you notice several changes happening at the same time, it’s sensible to have them assessed rather than repeatedly filling and repainting cracks. Leaving active subsidence untreated can allow movement to continue, potentially making the repair more complex.

    When to Get a Professional Survey (and What It Involves)

    A professional survey is particularly useful when you can’t tell whether movement is ongoing or when several signs appear together.

    The first stage is understanding the property and the movement pattern. This means looking at the location and direction of cracks, changes around doors and windows, uneven floors, and external brickwork, as well as factors such as trees, drainage and the underlying ground conditions. Ongoing measurements can then help establish whether movement is taking place. This is important because visual inspection alone can’t always tell us whether a crack is stable.

    For homeowners who have noticed cracking but are unsure whether it’s moving, monitoring can provide useful evidence over time. Our Subcheck service establishes a sub-millimetre baseline and monitors changes so movement can be identified rather than simply assumed.

    Ultimately, an assessment aims to identify the likely cause and determine whether the foundations require treatment. In some cases, monitoring might be appropriate; in others, the evidence points to immediate repair.

    Fixing It Safely: Your Repair Options

    The right repair often depends on the cause and extent of the ground movement. When subsidence is linked to localised weakness, resin injection can strengthen the supporting ground without the excavation needed for traditional underpinning. The resin is injected into targeted areas, where it expands and forms a load-bearing material.

    Underpinning takes a different approach, usually involving excavation to strengthen or extend the existing foundations. It can still be useful in certain situations, so you need to establish the cause of the movement. This is why you should consider the differences between resin injection and traditional underpinning alongside the findings of a professional assessment.

    The key isn’t to assume every crack requires major structural work, but also not to ignore signs of active movement because they seem minor. Understanding what’s happening under the property gives you the information you need to choose an appropriate repair.

    If you’ve noticed cracking or other signs of movement and aren’t sure what they mean, contact our team for professional advice and a free survey.