Selling a house with subsidence in the UK

What is subsidence?

Subsidence is the downward movement of the ground beneath a building's foundations, causing the structure above to sink or settle unevenly.

It is different from settlement (which is normal, minor movement in a new building), heave (upward ground movement), or simple wall cracks caused by thermal expansion.

True subsidence typically manifests as diagonal cracks at corners of windows and doors, cracks that are wider at the top than the bottom, and doors or windows that stick or no longer close properly. A structural engineer or specialist surveyor can confirm whether movement is active subsidence or a historical issue that has stabilised.

Common causes of subsidence in the UK

The most common cause of residential subsidence in the UK is clay soil shrinkage during extended dry spells. Clay-rich soils shrink when they dry out, removing support from foundations. This is especially common in properties built before the 1950s, when shallow foundations were standard.

Tree roots are another frequent cause. Large trees, particularly oaks, willows, and poplars, extract moisture from clay soils, accelerating the shrinkage beneath nearby foundations.

Leaking drains are a third cause. Where underground pipes have cracked or degraded, water eroding surrounding soil can undermine foundations over time.

In South Yorkshire specifically, mining subsidence is a significant consideration. Large areas of the region sit over former coal mining workings. Ground movement caused by historic underground extraction has affected many properties in areas around Barnsley, Doncaster, Rotherham, and parts of Sheffield. This type of subsidence may be covered by a Coal Authority claim rather than a standard insurance claim.

Active subsidence versus remediated subsidence

This distinction is crucial for understanding what your property can and cannot be sold for.

Active subsidence means the ground movement is ongoing. The building is still moving. This is the situation that causes the most concern among buyers and mortgage lenders, it means the problem has not yet been resolved.

Remediated subsidence means the cause of movement has been identified and treated, the building has been stabilised (often via underpinning, root barrier installation, or drain repair), and a structural engineer has confirmed the movement has stopped. Properties with remediated subsidence and a structural warranty or engineer's certificate are in a significantly better position commercially.

Historical movement that has stabilised, sometimes called "historic" subsidence, sits between these two positions. The ground is no longer moving, but there has been no formal remediation. Each buyer and lender will assess this differently.

What you must declare

The TA6 Property Information Form, which you complete as part of any sale, asks directly about structural movement, subsidence, and whether you are aware of any claims relating to the property's structure. You must answer these questions honestly.

If you know the property has subsidence and do not declare it, you are at risk of a misrepresentation claim after completion. Buyers and their solicitors make decisions based on your answers to this form. Non-disclosure can have serious legal consequences.

The mortgage lender problem

Most high-street mortgage lenders will not offer a mortgage on a property with active subsidence. Some will not lend on properties with a history of subsidence even where it has been remediated, depending on the extent and method of repair.

This restricts your buyer pool considerably. Cash buyers, who do not need a mortgage, are not subject to these restrictions. Property investors who buy with cash or via specialist lending may also be willing to proceed where a standard mortgage buyer cannot.

Does subsidence devalue a property?

Yes, typically. The extent depends on:

• Whether the subsidence is active or remediated
• The method and quality of any remediation
• Whether a structural warranty or insurance-backed guarantee is in place
• The local market and buyer appetite

Active subsidence can reduce a property's value by 20 to 40 percent or more compared to an equivalent property without the issue. Remediated subsidence with appropriate documentation typically attracts a smaller discount, often 10 to 20 percent.

Do you need to fix the subsidence before selling?

No. You are not legally required to remediate subsidence before selling. But the decision affects your options significantly.

Underpinning, the most common structural solution, involves strengthening the foundations by excavating beneath them and pouring concrete to a greater depth. Costs range from £5,000 to £50,000 or more depending on the extent of the problem and the property.

If you remediate, you open the property to mortgage-backed buyers and achieve a higher price. If you sell without remediating, you sell to a smaller pool at a lower price, but you avoid the upfront cost and time.

Your options for selling

Remediate, then sell on the open market

This is the route that achieves the highest price but requires time and upfront cost. If the cause of subsidence has been treated, the structure stabilised, and appropriate warranties obtained, the property can be sold conventionally.

Sell at auction

Auction attracts property investors and experienced buyers who are comfortable with structural issues. The legal pack discloses the subsidence position fully before the auction, and buyers bid accordingly. Exchange is on the day of auction, removing fall-through risk.

Sell to a cash buyer

A cash buyer is not constrained by mortgage lender requirements. South Yorkshire Property Buyers buys properties with subsidence across Sheffield, Rotherham, Doncaster, Barnsley and surrounding areas.

This is particularly relevant in South Yorkshire where mining subsidence affects a significant number of properties. We buy the property as it stands, without requiring remediation, and cover your legal costs.

The price reflects the situation honestly, 80 to 85 percent of our assessed market value given the subsidence, but there are no estate agent fees and no further solicitor costs to you.

Please note: taxes including Capital Gains Tax remain the seller's responsibility. We recommend seeking independent tax advice if applicable.

Common questions

Does subsidence devalue a house?

Yes. Active subsidence can reduce value by 20 to 40 percent. Remediated subsidence with documentation typically attracts a smaller discount of 10 to 20 percent. The reduction reflects the narrower buyer pool and the risk premium buyers apply to structural issues.

Can you get a mortgage on a house with subsidence?

Most high-street lenders will not approve a mortgage on a property with active subsidence. For remediated properties, some lenders will consider an application where adequate structural reports and warranties are in place, but policies vary significantly between lenders.

Do I have to declare subsidence when selling?

Yes. The TA6 Property Information Form requires you to disclose known subsidence. Failure to declare it when you are aware of it can constitute misrepresentation, which can have serious legal consequences after completion.

What is mining subsidence in South Yorkshire?

Mining subsidence is ground movement caused by the settlement of former underground coal workings. South Yorkshire has extensive former coalfield areas, and mining subsidence affects properties in parts of Barnsley, Doncaster, Rotherham and Sheffield.

Claims relating to mining subsidence may be handled by the Coal Authority (formerly British Coal) rather than a standard buildings insurer. A specialist surveyor can advise on whether this applies.

Can a cash buyer buy a property with subsidence?

Yes. A cash buyer is not subject to mortgage lender restrictions on subsidence properties. South Yorkshire Property Buyers buys properties with subsidence as part of our regular operations. We do not require the issue to be remediated before we purchase.