Can you reclaim the 3% SDLT surcharge if a property had damp, mould or neglect when you bought it?

Introduction

Many buyers ask whether they can reclaim Stamp Duty Land Tax (SDLT), especially where they paid the 3% higher rates and the property was in poor condition when they bought it. A common line of enquiry is whether damp, mould, disrepair or general neglect made the property unsuitable for use as a dwelling at the effective date of the transaction.

This matters because, in some cases, a building that is genuinely not suitable for use as a dwelling may fall outside the ordinary residential SDLT rules. That can affect both the rate charged and whether any higher rates for additional dwellings were due. However, the legal threshold is now relatively high, particularly after the Court of Appeal decision in Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799.

The Question

The issue can be put like this: a buyer purchased a property in England or Northern Ireland within the last four years, paid SDLT including the 3% higher rates, and later wondered whether the property’s poor condition at completion might mean too much SDLT was paid. The defects may have included damp, mould, neglect or other hazards.

The practical question is whether those defects were serious enough, at the date of purchase, to mean the property was not suitable for use as a dwelling for SDLT purposes, and whether that opens the door to an SDLT reclaim.

Nick’s Explanation

Nick’s core point was that a reclaim may be worth exploring where four features are present:

• the purchase took place within the last four years;
• the property is in England or Northern Ireland;
• the property had significant condition issues when bought; and
• the buyer paid the 3% higher rate surcharge.

That said, the existence of damp, mould or neglect does not automatically mean SDLT was overpaid. The key question is not whether the property needed work, but whether it was actually unsuitable for use as a dwelling at the effective date of the transaction.

In anonymised terms, Nick’s explanation can be summarised as follows: if the property’s physical condition was severe enough at completion, there may be grounds to revisit the SDLT treatment; but the legal test is strict, and ordinary disrepair or refurbishment needs will often not be enough.

The Law

SDLT is charged under the Finance Act 2003. Whether a property is taxed as residential property depends on the statutory definition in section 116 Finance Act 2003.

Broadly, a building counts as residential property if it is used or suitable for use as a dwelling, or is in the process of being constructed or adapted for such use. If a building is not suitable for use as a dwelling at the effective date of the transaction, it may fall outside the residential rules.

The 3% higher rates for additional dwellings apply to certain purchases of major interests in a single dwelling or additional dwellings, subject to the detailed rules in Schedule 4ZA Finance Act 2003.

The question of whether a property is “suitable for use as a dwelling” has been considered in a number of cases. The courts have repeatedly made clear that the test is an objective one, focused on the property’s condition at the effective date of the transaction. It is not enough that the buyer intended major works, or that the property was unattractive, dated or in poor repair.

In an uninhabitable or “not suitable for use” case, the threshold is now relatively high following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799. That authority reinforces that serious disrepair alone will not necessarily prevent a property from being suitable for use as a dwelling. The condition must be such that, viewed realistically and objectively, the building was not suitable for residential use at the relevant time.

Analysis

The analysis usually works in five stages.

1. Identify the effective date of the transaction

   The property’s condition must be assessed as at the effective date for SDLT purposes, usually completion. Later discoveries, later deterioration, or the extent of renovation eventually carried out are not decisive in themselves.

2. Decide whether the building was suitable for use as a dwelling

   This is the central issue. A property may still be suitable for use as a dwelling even if it has damp, mould, outdated services, cosmetic damage, broken fittings or a need for substantial refurbishment. Many properties bought for renovation remain residential for SDLT purposes.

   What tends to matter is whether there was a real absence of the basic features needed for normal residential occupation, or whether the condition problems were so severe that occupation as a dwelling was not realistically possible.

3. Consider the evidence of condition

   Useful evidence may include survey reports, photographs, contractor assessments, mortgage valuation comments, environmental health material, insurance issues, and records showing whether key utilities or facilities were missing or unusable. The stronger the contemporaneous evidence, the better.

4. Assess the SDLT treatment that was originally applied

   If the property was treated as residential and the 3% surcharge was paid, a buyer may ask whether, on the correct legal analysis, that treatment was wrong. If the property was not suitable for use as a dwelling, the higher rates may not have applied in the way originally assumed.

5. Check whether a claim is still in time

   In many SDLT cases, amendment and overpayment relief time limits are critical. A buyer who completed within the last four years may still be within a relevant window to challenge the original return, but the exact route depends on the circumstances and timing.

The important point is that not every defective property qualifies. Damp and mould can be relevant, but they are only part of the picture. The legal question is whether the defects crossed the line from disrepair into genuine unsuitability for use as a dwelling.

Following Mudan, that line is harder to cross than many buyers assume. A property that is unpleasant, unhealthy, or in poor condition may still be treated as a dwelling for SDLT purposes if it retains the essential character and functionality of a home.

Outcome

A buyer may have grounds to explore an SDLT reclaim where a property was in very poor condition at purchase and the 3% higher rates were paid. But a reclaim is not justified merely because the property had damp, mould, neglect or needed renovation.

The practical conclusion is this: there may be a valid reclaim only if the condition at completion was serious enough that the property was objectively not suitable for use as a dwelling. Because of Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, the threshold for proving that is now relatively high.

Practical Steps

1. Check the completion date to see whether a claim may still be in time.
2. Obtain the SDLT return and confirm exactly what SDLT was paid, including whether the 3% higher rates applied.
3. Gather contemporaneous evidence of the property’s condition at completion, especially surveys, photographs, valuations and contractor reports.
4. Focus on evidence showing whether the property lacked the basic features of a dwelling or was genuinely incapable of normal residential occupation.
5. Compare the facts carefully against the current case law, including Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799.
6. Assess whether the issue is truly one of unsuitability for use as a dwelling, rather than ordinary disrepair or a need for refurbishment.

Conclusion

You cannot assume that a neglected or damaged property qualifies for an SDLT refund. The question is whether it was actually unsuitable for use as a dwelling at the date of purchase. That is now a demanding test, and after Mudan only more serious cases are likely to succeed.

Legal References Used

• Finance Act 2003
• Finance Act 2003, section 116
• Finance Act 2003, Schedule 4ZA
• 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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