Can you reclaim SDLT if a property was derelict or uninhabitable at purchase?

Introduction

Many buyers assume that if a building was derelict, unsafe or long empty when they bought it, they must have overpaid Stamp Duty Land Tax (SDLT). That is sometimes true, but not always. The key question is not whether the property looked poor or needed major works. The real question is how the property was classified for SDLT at the effective date of the transaction.

In practice, most SDLT reclaim arguments in this area turn on whether the property should have been treated as residential or non-residential, and whether the building was genuinely unsuitable for use as a dwelling at the relevant time. That second argument has become harder following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, which confirms that the threshold for showing a dwelling was not suitable for use is now relatively high.

The Question

A buyer had two purchases under review for a possible SDLT reclaim:

• a lower-value purchase involving derelict former outbuildings and similar structures, said to be long disused and in very poor condition; and
• a higher-value purchase involving a large building previously divided into multiple flats, said to have been empty for many years and affected by issues such as failed heating, unsafe electrics, defective water systems, leaks and rotten floors.

The buyer wanted to know what any SDLT claim would actually be based on, especially where the property was described as “derelict” or “non-residential”.

Nick’s Explanation

Nick’s central point was that an SDLT reclaim in this type of case usually depends on the difference between residential and non-residential SDLT treatment, not simply on the fact that a property was in poor condition.

In anonymised form, his explanation was:

“Stamp duty reclaims work because of the difference between ‘residential’ and ‘non-residential’ rates of stamp duty.”

He then illustrated an important practical point. For a purchase price of £750,000, the SDLT result can differ sharply depending on whether the buyer paid residential rates with the 3% higher rates surcharge, or whether the transaction should instead have been treated as non-residential or mixed-use.

His figures showed this clearly:

• for an owner-occupier buying at £750,000, residential SDLT could actually be lower than non-residential SDLT, so there may be no reclaim at all on a reclassification argument; but
• for an investor paying the 3% surcharge, residential SDLT at £750,000 could be far higher than non-residential SDLT, creating a potentially significant reclaim if the original treatment was wrong.

He also focused on procedure and evidence, asking for transaction documents and condition evidence such as photographs, certificates, invoices and signed conveyancing papers. That reflects how these cases are assessed in practice: even a strong substantive argument can fail without proper evidence and a claim made within the statutory amendment window.

The Law

The main SDLT charging rules are in the Finance Act 2003.

Broadly:

• SDLT is charged on land transactions under Part 4 of the Finance Act 2003.
• The amount payable depends on the nature of the subject matter of the transaction, including whether it is residential property or non-residential property.
• Residential property is defined in section 116 Finance Act 2003.
• Property that is not residential property is generally treated as non-residential property.
• Schedule 4ZA Finance Act 2003 contains the higher rates for additional dwellings, often called the 3% surcharge.

In many disputes, the issue is whether the property was a “dwelling” at the effective date of the transaction. If it was, residential rates may apply, and the higher rates surcharge may also apply depending on the buyer’s circumstances. If it was not residential property, non-residential rates may apply instead.

There has been substantial case law on whether a building in poor condition still counts as a dwelling. The courts have made clear that disrepair alone is not enough. A building can remain a dwelling even if it is unattractive, vacant, outdated or in need of major renovation.

In particular, readers should note Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799. In uninhabitable or not suitable for use cases, that decision means the condition thresholds are now relatively high. The fact that a property has defective services, damp, leaks, infestation, structural problems or long-term vacancy does not automatically mean it ceased to be a dwelling for SDLT purposes. The test is stricter than many buyers expect.

Analysis

To assess whether there is a real SDLT reclaim, it helps to work through the issues in order.

First, identify what SDLT treatment was actually used on the original return.

This is fundamental. A reclaim only arises if too much SDLT was paid. So the starting point is the SDLT5 certificate, the SDLT return and the completion statement. You need to know:

• whether the property was returned as residential or non-residential;
• whether the 3% higher rates surcharge was paid; and
• what total SDLT was paid.

Second, identify the legal basis of the proposed reclaim.

In a case like this, there are usually two possible lines of argument:

• the property was not residential property at all, so non-residential rates should have applied; or
• the property was mixed-use, so non-residential rates should have applied to the transaction as a whole.

From the material provided, the main argument appears to be the first: that the buildings were derelict or unsuitable for use as dwellings.

Third, separate “derelict” in everyday language from “not a dwelling” in SDLT law.

This is where many claims go wrong. A buyer may honestly describe a property as derelict, unsafe or uninhabitable, but the SDLT question is narrower. The tribunal and appellate courts ask whether, at the effective date, the building was suitable for use as a dwelling in the legal sense. That is not the same as asking whether it was pleasant, modern, mortgageable or ready for immediate occupation without works.

Following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, the threshold is relatively high. Evidence of disrepair helps, but it must show more than serious neglect. The defects must be strong enough to support the conclusion that the building was not suitable for use as a dwelling at the relevant date.

Fourth, consider the price point and buyer status.

Nick’s figures highlight an important SDLT reality:

• if the buyer was an owner-occupier and the price was around £750,000, moving from residential to non-residential rates may produce little benefit or even none at all;
• if the buyer was an investor and paid the 3% surcharge, reclassification to non-residential can produce a substantial repayment.

So even if the legal argument were sound, the value of the claim depends on how the original SDLT was calculated.

Fifth, analyse each property separately.

A former stable block or sawmill may raise a different SDLT question from a building previously arranged as flats. If a structure was never a dwelling at the effective date, the argument may not depend on “uninhabitable dwelling” case law at all. But if a building was previously used as flats or houses, the dispute is more likely to centre on whether those units still counted as dwellings despite their condition.

That distinction matters. A building with a residential history is not automatically non-residential just because it has been empty for years.

Sixth, check the time limit.

Nick referred to HMRC’s four-year deadline. That reflects the normal amendment window for SDLT returns. In practical terms, if the claim is out of time, even a good substantive argument may not be recoverable through the ordinary amendment route. Timing should therefore be checked at the start, not at the end.

Seventh, gather objective evidence from the transaction date.

Condition evidence is strongest where it is contemporaneous. Useful documents often include:

• dated photographs and videos;
• surveyor or valuation reports;
• electrical, gas or water safety reports;
• builders’ quotations and invoices close to completion;
• planning and building control records;
• auction particulars or sales particulars;
• insurance records;
• council tax and rating records; and
• signed transfer deeds, contracts, completion statements and SDLT filings.

Evidence created long after completion is usually less persuasive than records that existed at or near the effective date.

Outcome

A derelict or long-empty property does not automatically entitle a buyer to an SDLT refund.

The practical answer is this:

• there may be a valid reclaim if the property was wrongly treated as residential and should instead have been taxed at non-residential rates;
• the amount recoverable depends heavily on whether the buyer paid the 3% higher rates surcharge;
• for lower-value purchases, an owner-occupier may see little or no benefit from reclassification;
• for investors, the difference can be substantial; and
• where the argument is that the property was not suitable for use as a dwelling, success now requires strong evidence because the threshold is relatively high after Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799.

Practical Steps

If you are assessing a possible SDLT reclaim on a derelict or uninhabitable property, take these steps:

1. Obtain the SDLT5 certificate, SDLT return and completion statement.
2. Confirm whether the property was returned as residential, non-residential or mixed-use.
3. Check whether the 3% higher rates surcharge was paid.
4. Work out the SDLT actually paid and compare it with the SDLT that would have been due under the proposed alternative treatment.
5. Gather contemporaneous evidence of the property’s condition at completion, especially survey reports, photographs and service safety evidence.
6. Review the property’s actual character at the effective date, not just its historical use.
7. Check whether the normal four-year amendment deadline has expired.
8. Assess the case against current authority, including the stricter approach to suitability for use as a dwelling confirmed by the Court of Appeal.

Conclusion

The right question is not simply “was the property derelict?” but “was the SDLT return wrong under the Finance Act 2003?” A reclaim may exist where a property should have been taxed as non-residential rather than residential, especially if higher rates were paid. But in uninhabitable dwelling cases, the legal threshold is now relatively demanding, and strong contemporaneous evidence is essential.

Legal References Used

• Finance Act 2003, Part 4
• 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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