Can a fire-damaged property with structural defects be treated as non-residential for SDLT?

Introduction

Buyers often ask whether a badly damaged house can be taxed as non-residential property for Stamp Duty Land Tax purposes. The issue usually arises where the building has serious defects such as fire damage, structural instability, missing services or extensive disrepair. If the property is not a “dwelling” at the effective date of the transaction, the non-residential SDLT rates may apply.

The difficulty is that the legal test is now demanding. In uninhabitable or not suitable for use cases, the threshold is relatively high following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799. A property does not stop being a dwelling simply because it is in very poor condition or needs major works. The real question is whether, at the date of purchase, it was suitable for use as a dwelling or had lost its identity as one.

The Question

A buyer is purchasing a very run-down residential property. The building has extensive fire damage and serious structural problems. Although it is currently uninhabitable, it is capable of repair if enough time and money are spent on it. The buyer wants to know whether there is still a realistic basis for filing the SDLT return on a non-residential basis, given the stricter approach now being taken in this area.

Nick’s Explanation

Nick’s view was that, on the survey evidence he had seen, the property had a credible argument for having “lost its identity” as a dwelling and for being not “suitable for use as a dwelling” at the time of purchase. He attributed that view mainly to the extent of the fire damage and the seriousness of the structural defects.

In anonymised form, his key points were:

• SDLT is a self-assessed tax, so the purchaser must decide what the correct treatment is under the law at the filing date.
• If the buyer concludes, on the evidence and the case law, that the property was not suitable for use as a dwelling, the return may be filed on a non-residential basis.
• Conveyancers are often cautious about this point and may be reluctant to submit a non-residential return unless the client gives clear written instructions.
• If HMRC open an enquiry, the buyer will need to support the return with proper evidence, such as survey reports, photographs and a clear explanation of the condition of the building at completion.

That is a practical summary rather than a guarantee of outcome. In this area, a buyer may have an arguable case and still face challenge from HMRC.

The Law

SDLT is charged under the Finance Act 2003. For these purposes, the key issue is whether the subject matter of the transaction includes a “dwelling”. If it does, residential rates may apply. If it does not, the transaction may fall to be taxed at non-residential rates.

The relevant statutory provisions are in Schedule 4ZA to the Finance Act 2003 and the wider SDLT code in the Finance Act 2003. The case law has developed the meaning of “suitable for use as a dwelling” and the related idea that a building may in some circumstances have “lost its identity” as a dwelling.

The leading modern authority is Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799. That decision makes clear that the test is strict. The court’s approach means that many buildings in poor or even very poor condition will still count as dwellings if, viewed realistically, they remain buildings of a residential character that have not crossed the line into something no longer suitable for use as a dwelling.

In broad terms, the authorities show the following:

• The test is applied at the effective date of the transaction, usually completion.
• The question is about the condition of the property at that date, not what the buyer intends to do with it afterwards.
• Serious disrepair alone is not necessarily enough.
• The fact that substantial renovation is needed does not automatically prevent the property being a dwelling.
• The stronger cases usually involve very severe physical damage, major structural failure, or a condition showing that the building has ceased in any practical sense to be suitable for residential occupation.

Analysis

When applying the rules to a fire-damaged property with structural issues, the analysis should be done carefully and in stages.

First, identify the relevant date. The legal test is applied at completion, not after works begin and not by reference to future plans.

Second, focus on the actual physical condition of the building. Important questions include:

• Was there severe fire damage affecting the habitability or integrity of the structure?
• Were there major structural defects making occupation unsafe?
• Were essential parts of the building missing, destroyed or unusable?
• Could a person realistically live there as a dwelling at that date?
• Did the building still retain the character and identity of a house, even though in very poor condition?

Third, separate “uninhabitable today” from “not suitable for use as a dwelling” in the legal sense. This is where many cases fail. A building may be impossible or unsafe to occupy without works, but still remain a dwelling for SDLT purposes if it has not crossed the legal threshold established by the authorities.

Fourth, consider the effect of Mudan. Following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, the threshold in uninhabitable cases is relatively high. The court did not adopt a simple rule that serious damage or expensive repairs automatically make a property non-residential. A buyer therefore needs more than evidence that the house is in an awful state or that renovation costs are substantial.

Fifth, look at whether there is evidence that the building had genuinely lost its identity as a dwelling. In a stronger case, the damage may be so extensive that the building is no longer realistically recognisable as a usable residence at all. Severe fire damage combined with significant structural failure may help support that argument, but the result will always depend on the facts and the evidence.

On the facts described here, there may be an arguable basis for non-residential treatment if the fire and structural damage were truly extensive at completion. That said, this is not an easy category of case. The fact that the property is repairable does not by itself defeat the argument, but it does mean the buyer must show that, at the relevant date, the condition had gone beyond ordinary or even major disrepair.

Outcome

A badly fire-damaged property with severe structural problems can, in some cases, be treated as non-residential for SDLT. But the legal threshold is now high. Following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, it is no longer enough to point to serious disrepair, high repair costs or temporary uninhabitability.

If the evidence shows that the building had genuinely lost its identity as a dwelling, a non-residential filing position may be arguable. If the property still remained, in substance, a damaged house needing major works, HMRC may well say it was still a dwelling.

Practical Steps

If you are assessing a similar purchase, the sensible next steps are:

• Obtain and keep a full survey, structural engineer’s report and any fire damage reports.
• Keep dated photographs and videos showing the exact condition at completion.
• Record any evidence of danger, instability, or destruction of key residential features.
• Ask whether the building was merely in disrepair, or whether it had truly ceased to be suitable for use as a dwelling.
• Review the facts against Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799 and any other relevant authorities.
• If the return is filed on a non-residential basis, make sure the decision is supported by contemporaneous evidence and a clear written analysis.
• Be prepared for the possibility of an HMRC enquiry within the statutory window.

Conclusion

A fire-damaged and structurally unsound house may qualify for non-residential SDLT treatment, but only if the facts are strong enough to show that it was not suitable for use as a dwelling at completion. After Mudan, the bar is relatively high. The decision will turn on the actual condition of the building and the quality of the evidence, not simply on the scale of the repair bill.

Legal References Used

• Finance Act 2003
• 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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