Is It Too Late to Claim an SDLT Refund for a Property Later Found to Be Unsafe?

Introduction

Buyers sometimes discover serious structural defects only after completion. In some cases, they then ask whether the property was really suitable for use as a dwelling on the purchase date, and whether that could reduce the Stamp Duty Land Tax (SDLT) charged. A common follow-up question is whether a refund can still be claimed years later, especially where the building has since become dangerous or has been demolished.

The timing point is critical. Even if there may once have been an argument that the dwelling was not suitable for use, SDLT claims are subject to strict amendment deadlines. If that deadline has passed, the position is usually closed.

The Question

A buyer purchased a high-value residential property several years ago. The property included a separate annex, and Multiple Dwellings Relief had already been claimed successfully. The main house was listed and in a conservation area, so renovation was delayed while consents were obtained. After works began, a major wall collapsed. It later emerged that the structure was unsafe, and the building was eventually demolished. The buyer is now rebuilding and wants to know whether, given the later discovery of the defect and the demolition, it is still possible to claim an SDLT refund on the basis that the dwelling was not suitable for use.

Nick’s Explanation

Nick’s answer was short and direct: the buyer was out of time.

In anonymised form, his point was:

“Unfortunately you are timed out. The maximum period in which you can amend your Stamp Duty Land Tax self-assessment where a mistake has occurred is four years.”

That is the key practical answer. Whatever the underlying merits of an argument about the property’s condition at the effective date of the transaction, the normal time limit for amending an SDLT return is four years. Once that period has expired, a repayment claim is generally no longer available through the ordinary amendment route.

The Law

SDLT is charged under the Finance Act 2003. Whether property is treated as residential for SDLT purposes depends in part on whether there is a building that is used or suitable for use as a dwelling, or is in the process of being constructed or adapted for such use.

The main statutory provisions usually considered in this area are:

• Finance Act 2003, section 43
• Finance Act 2003, section 55
• Finance Act 2003, section 116
• Finance Act 2003, Schedule 10

Where a taxpayer believes the original SDLT return was wrong, the usual route is to amend the land transaction return. The time limit is set by Finance Act 2003, Schedule 10. Broadly, a return may be amended within 12 months of the filing date, but HMRC practice and the wider SDLT self-assessment framework also recognise a four-year outer limit for correcting mistakes by way of repayment claims in the ordinary course. In practical terms, if the transaction took place more than four years ago, the buyer will normally be out of time to recover SDLT on the basis that too much tax was paid.

On the substantive issue of whether a property is suitable for use as a dwelling, the courts have made clear that the test is applied at the effective date of the transaction, usually completion. The question is not simply whether the property needed repair or renovation, or whether serious defects were later uncovered. The threshold for showing that a building was not suitable for use as a dwelling is now relatively high following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799.

Analysis

The position can be analysed in two stages: first, whether there may ever have been a substantive SDLT argument; second, whether the buyer can still bring that argument now.

First, on the underlying merits, a later collapse or demolition does not by itself prove that the dwelling was unsuitable for use at completion. The legal test looks at the property’s condition on the purchase date. Many older properties need extensive work, and some have hidden defects, but they may still be treated as dwellings for SDLT purposes. The courts have increasingly taken a strict approach. In an uninhabitable or not suitable for use case, the condition thresholds are now relatively high following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799.

That means a taxpayer would need strong evidence showing that, at completion, the building was in such a state that it was not suitable for use as a dwelling in any real sense. Evidence discovered later can help illuminate the earlier condition, but the focus remains fixed on the transaction date.

Second, even if the buyer could have assembled a credible case on the facts, the timing problem is decisive here. If the purchase took place about four and a half years ago, the normal four-year period for correcting an SDLT overpayment has already expired. Once that happens, the claim is generally barred.

The fact that the buyer only discovered the possible SDLT issue recently does not usually extend the statutory time limit. Nor does the fact that the structural failure became obvious later, or that demolition happened years after completion. SDLT deadlines are rigid and are not normally postponed just because the taxpayer became aware of the point later.

It is also worth noting that the buyer had already made an SDLT relief claim in relation to the annex. That does not prevent a separate argument about suitability for use, but it does not alter the time limits either. The existence of an earlier successful amendment or refund does not reopen the whole transaction indefinitely.

Outcome

The practical conclusion is that if more than four years have passed since the SDLT filing position could have been corrected, the buyer is usually too late to claim a refund.

So, even if there might once have been an arguable case that the property was not suitable for use as a dwelling at completion, the ordinary SDLT amendment and repayment window has expired. In that situation, the claim is effectively out of time.

Practical Steps

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

• Identify the effective date of the transaction, usually completion.
• Check the SDLT filing date and calculate whether four years have already passed.
• Gather evidence of the property’s actual condition at completion, not just what happened later.
• Review survey reports, structural reports, photographs, correspondence, planning or listed building material, and contractor evidence that sheds light on the purchase-date condition.
• Consider the current high threshold for proving that a dwelling was not suitable for use, especially in light of Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799.
• Take prompt specialist advice before the four-year limit expires, because delay can remove the possibility of any refund even where the facts are strong.

Conclusion

A later structural collapse, condemnation, or demolition does not automatically create an SDLT refund. The legal question is whether the property was suitable for use as a dwelling at the date of purchase, and that is now a demanding test. But in many real cases the decisive issue is simpler: if the four-year SDLT correction window has passed, the buyer is usually out of time to reclaim the tax.

Legal References Used

• Finance Act 2003, section 43
• Finance Act 2003, section 55
• Finance Act 2003, section 116
• Finance Act 2003, Schedule 10
• 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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