How do I apply for an SDLT refund if I think the property was not suitable for use?

Introduction

People often ask whether they can reclaim Stamp Duty Land Tax (SDLT) where a property was in poor condition when bought. A common example is a dwelling with outdated services, defective heating, poor insulation or an old electrical installation. The key legal issue is not whether the property needed improvement, but whether it was truly unsuitable for use as a dwelling on the effective date of the transaction.

This distinction matters because the legal threshold is now relatively high. A property that is dated, worn out or in need of repair will not usually qualify. Following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, the condition required to show that a property was not suitable for use as a dwelling is now understood to be a demanding test.

The Question

A buyer completed a condition questionnaire for a recently purchased residential property. The issues identified included old gas appliances, an old consumer unit, an old boiler, old lighting, poor or old insulation, no working heating, and a bathroom that needed updating. The buyer wanted to know how to proceed with an SDLT refund claim on the basis that the property may have been uninhabitable or not suitable for use.

Nick’s Explanation

Nick’s response in the source material was administrative rather than substantive: he said he was unsure why the registration process had failed and that a colleague would help sort it out. The underlying issue raised by the buyer, however, was whether the property condition could support an SDLT refund claim.

In practical terms, the important point is this: a claim does not succeed simply because a property has old fittings, poor energy efficiency, no working central heating, or rooms that need refurbishment. Those facts may show disrepair or obsolescence, but they do not automatically show that the building was not suitable for use as a dwelling for SDLT purposes.

The Law

The relevant legislation is found in the Finance Act 2003. SDLT treatment depends in part on whether the subject matter acquired is residential property. 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.

The key statutory provision is Schedule 4ZA to the Finance Act 2003, read together with the wider SDLT code in Part 4 of that Act. In cases about derelict or damaged homes, the dispute usually turns on whether the property was “suitable for use as a dwelling” at the effective date of the transaction.

Case law has developed this test. The courts have consistently distinguished between:

• a property that is still a dwelling, although in poor condition and needing repair or modernisation; and
• a property whose physical state is so serious that it is no longer suitable for use as a dwelling at all.

The modern approach has become stricter. In Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, the Court of Appeal confirmed that the threshold is relatively high. A property will not fall outside residential treatment merely because it is uncomfortable, outdated, neglected, or requires substantial works. The question is whether, viewed realistically on the effective date, it was actually unsuitable for use as a dwelling.

Analysis

Applying those rules step by step:

1. Start with the condition on the effective date

   The legal test is applied at the date of completion for SDLT purposes, not after later works or later inspection findings.

2. Separate disrepair from true unsuitability

   Old gas appliances, an old boiler, an old consumer unit, outdated bathroom fittings, old strip lights, and poor insulation usually point to age and disrepair. They do not by themselves show that the property had ceased to be a dwelling.

3. Consider the significance of no working heating

   A lack of working heating can be relevant, especially in winter or where the property has no practical means of occupation. But on its own it will not necessarily be enough. Many older houses have been held still to be dwellings even where heating, hot water or parts of the electrical system required replacement.

4. Ask whether the property could realistically be lived in as a home

   The courts look at the overall physical state. Was there basic shelter? Was the structure intact? Were there functioning sanitary arrangements? Was there water and electricity, or at least the practical ability to use the property as a home without wholesale reconstruction?

5. Look for evidence of serious physical failure

   Claims are stronger where there is major structural collapse, no usable kitchen or bathroom at all, severe contamination, dangerous instability, extensive fire damage, or conditions that make occupation practically impossible. The issues described here do not obviously reach that level.

6. Apply the higher threshold after Mudan

   Following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, the threshold for showing that a property was uninhabitable or not suitable for use is now relatively high. A dwelling in poor condition, even one requiring major renovation, may still remain residential property for SDLT purposes.

On the facts described, the condition issues are more likely to indicate a property needing updating and repair than a property that had ceased to be suitable for use as a dwelling. That means an SDLT refund claim on “unsuitable for use” grounds would need very careful evidence and may well face difficulty.

Outcome

The practical conclusion is that a property with old services, outdated fittings, poor insulation and no working heating will not automatically qualify for SDLT repayment. The legal test is stricter than many buyers expect. Unless the condition problems were severe enough to make the property genuinely unsuitable for use as a dwelling at completion, the purchase is likely still to be treated as residential for SDLT.

Practical Steps

If you are assessing whether you may have a valid claim, the sensible next steps are:

• gather evidence of the property’s exact condition at completion, including survey reports, photographs, invoices, and any mortgage valuation comments;
• identify whether there were failures going beyond disrepair, such as the absence of basic sanitary facilities, dangerous structural defects, or conditions preventing normal occupation;
• check whether utilities were connected and usable at the effective date;
• review the completion date carefully, because the legal test is fixed at that point;
• compare the facts against the current case law, especially the higher threshold confirmed in Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799;
• take specialist SDLT advice before submitting an amendment or repayment claim, because weak claims can be rejected and may create further correspondence with HMRC.

Conclusion

Needing renovation is not the same as being unsuitable for use as a dwelling. For SDLT purposes, the courts now apply a relatively high threshold. If the property was merely outdated, defective or uncomfortable, that is unlikely to be enough. A successful claim usually requires evidence that, at completion, the building had genuinely ceased to be usable as a home.

Legal References Used

• Finance Act 2003, Part 4
• 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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