Can you get an SDLT 3% surcharge refund if cladding problems stopped you selling your old home within 3 years?

Introduction

Many homeowners paid the higher rates of Stamp Duty Land Tax when they bought a new main residence before they had managed to sell their previous one. Normally, that extra SDLT can be reclaimed if the old home is sold within the standard time limit. The difficulty arises where the sale was delayed by events outside the owner’s control, such as unsafe cladding, missing EWS1 documentation, or remediation works that made the flat effectively unsaleable on the open market.

This is exactly the kind of issue readers search for when they want to know whether HMRC will allow a late refund claim. The answer depends on the replacement of main residence rules, the exceptional circumstances extension, and the evidence available to show why the sale could not realistically take place in time.

The Question

A homeowner bought a flat years before the building safety problems later became known. The flat was used as the owner’s main residence. The owner then moved out and bought a family home, paying the 3% higher rates of SDLT because the flat had not yet been sold.

The reason the flat was not sold at the time was that the building required cladding remediation works and did not have the documentation needed for a normal sale. More than three years then passed before the works were completed. The owner now wants to know whether selling the flat after that point could still allow a refund of the higher rates because the delay was caused by exceptional circumstances beyond the owner’s control.

A further concern is whether it matters that a small number of other flats in the same building were sold during the remediation period, usually to cash buyers and often at a substantial discount.

Nick’s Explanation

Nick’s view was that the homeowner appeared to have a good argument for a late refund claim. In anonymised form, his reasoning was:

Where the flat was bought before the cladding issues were known, and the owner was unaware of those fire safety problems at the time of purchase, it is reasonable to argue that the later inability to sell arose from circumstances beyond the owner’s control.

He also identified the practical evidence HMRC would expect to see, including:

• evidence that the former home has now been sold;
• the SDLT filing and purchase documents for the replacement home on which the higher rates were paid;
• a clear written explanation linking the facts to HMRC’s published guidance on exceptional circumstances.

On the follow-up point, Nick considered that the fact some other flats sold at heavy discounts did not necessarily defeat the claim. His view was that HMRC would focus on the taxpayer’s own position: what SDLT was paid on the new home, when the old home was eventually sold, and whether the delay beyond the normal deadline was genuinely outside the owner’s control.

He also distinguished HMRC’s example where a buyer knowingly purchased a cladding-affected flat at a reduced price. In that type of case, the later sale difficulty was foreseeable from the outset, so HMRC says no refund is due. That is materially different from a case where the owner bought long before the issues emerged.

The Law

The higher rates for additional dwellings are set out in Schedule 4ZA to the Finance Act 2003. Where a person buys a new main residence before selling their previous main residence, the higher rates may apply on the new purchase.

If the new purchase is genuinely a replacement of a main residence, the buyer can usually reclaim the extra SDLT if the previous main residence is disposed of within the permitted period.

HMRC’s guidance also recognises that, in some cases, a disposal may happen outside the normal time limit because of exceptional circumstances beyond the taxpayer’s control. The relevant guidance appears in the SDLT Manual at SDLTM09807 and in HMRC’s repayment guidance for higher rates on additional properties.

The key points in HMRC’s approach are usually these:

• the earlier property must have been the buyer’s previous main residence;
• the later property must have been bought as the replacement main residence;
• the previous main residence must eventually be sold;
• the delay beyond the normal deadline must have been caused by exceptional circumstances beyond the buyer’s control;
• those circumstances must not have been reasonably foreseeable when the buyer acquired the former property or, depending on the facts, when the replacement purchase took place.

In cladding cases, HMRC’s published examples are important. Example 2 in SDLTM09807 supports the principle that a late refund may be available where the owner bought before the cladding problem was known and could not sell because of later building safety issues. Example 3 denies relief where the buyer knowingly acquired a defective cladding property at a discount, so the difficulty was foreseeable.

Where readers are considering whether a property was uninhabitable or not suitable for use, the condition thresholds are now relatively high following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799. That case makes clear that ordinary disrepair, inconvenience, or serious defects will not automatically mean a dwelling is unsuitable for use as a dwelling. However, that is a separate issue from the replacement of main residence refund rules. In a cladding case, the stronger argument is usually not “unsuitable for use” at purchase, but rather that the old home could not be sold within the normal period because of exceptional circumstances outside the owner’s control.

Analysis

The analysis usually works in five steps.

First, identify whether the old flat was genuinely the previous main residence. If the owner lived there as their home before moving to the new property, that condition is likely to be satisfied.

Second, confirm that the new house was bought as the replacement main residence and that the higher rates were paid on that purchase because the old flat had not yet been sold.

Third, consider the timing. Ordinarily, the previous main residence must be sold within the normal statutory period for a refund. If more than three years have passed, the claim becomes an out-of-time or late claim argument based on exceptional circumstances.

Fourth, examine the cause of the delay. In a cladding case, the strongest facts are usually:

• the flat was purchased before the cladding defect became known;
• the owner had no reason to know of the issue at the time of purchase;
• the building required remediation works;
• the lack of an EWS1 or equivalent marketable position meant ordinary buyers could not proceed;
• the flat could not realistically be sold in the normal market until the works were completed.

Those facts align closely with HMRC’s favourable example. They support the argument that the delay was not caused by the owner’s choice, but by external building safety conditions that prevented a normal sale.

Fifth, test the possible weakness: if a few other flats in the same block sold to cash buyers at large discounts, does that show the property was still saleable? Not necessarily. HMRC’s question is not simply whether any sale was theoretically possible at any price. The real issue is whether the owner was prevented, by circumstances beyond their control, from disposing of the former main residence within the usual period in the ordinary course.

A distressed sale to a narrow pool of cash buyers at a substantial discount does not automatically mean the owner had a realistic ability to sell in the normal market. It may show only that a limited emergency market existed. That does not by itself destroy the argument that the delay was caused by exceptional circumstances. It would, however, be sensible to explain this carefully in any claim.

The contrast with HMRC’s Example 3 is important. In that example, the taxpayer knowingly bought a cladding-affected flat at a reduced price. Because the defect and sale difficulty were known from the start, HMRC treats the later delay as foreseeable. In the present scenario, where the flat was bought years earlier without knowledge of the issue, that foreseeability point is much weaker for HMRC.

Outcome

On these facts, there is a credible basis for claiming a refund of the higher rates of SDLT after the eventual sale of the former main residence.

The strongest points are:

• the flat was acquired before the cladding issue was known;
• the owner says they were unaware of the defect when buying it;
• the sale delay was caused by remediation and building safety problems outside the owner’s control;
• HMRC’s own guidance includes an example that is broadly supportive.

The fact that some other flats may have sold at deep discounts to cash buyers does not automatically prevent a refund claim. It is a factor HMRC might look at, but it is not fatal if the owner can show that a normal sale within the required period was effectively blocked by the cladding position.

Practical Steps

If you are assessing a similar case, the practical steps are:

• collect the completion statement, SDLT5 certificate, TR1 and purchase documents for the replacement home where the higher rates were paid;
• collect the sale documents for the former main residence once it is sold;
• gather evidence of the cladding problem and the remediation timeline, such as managing agent letters, lender correspondence, EWS1-related communications, remediation notices, and documents showing why a normal sale could not proceed;
• prepare a short chronology showing when you bought the old home, when you moved out, when you bought the new home, why the old home could not be sold, when remediation completed, and when the sale finally took place;
• refer specifically to HMRC SDLTM09807 and explain why your facts are closer to Example 2 than Example 3;
• make clear that the issue was not simply inconvenience or a poor market, but a building safety defect and missing marketability requirements outside your control.

If HMRC raises the point that some sales still happened in the block, explain the difference between a normal open-market sale and a distressed sale to specialist or cash-only buyers at a heavy discount. The point is to show that the delay in your case was still caused by exceptional circumstances, not ordinary market choice.

Conclusion

A homeowner whose previous main residence could not be sold within three years because of unforeseen cladding and EWS1 problems may still have a sound basis for reclaiming the SDLT 3% surcharge. The case is strongest where the property was bought before the issue was known and the later delay can be evidenced clearly. The existence of a few discounted cash sales in the same building does not, on its own, remove that argument.

Legal References Used

• Finance Act 2003, Schedule 4ZA
• HMRC Stamp Duty Land Tax Manual, SDLTM09807
• HMRC guidance: Stamp Duty Land Tax: apply for a repayment of the higher rates for additional properties
• Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799

This page was last updated on 22 March 2026.

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