Can an uninhabitable property be taxed as non-residential for SDLT?

Introduction

Buyers often ask whether a run-down or damaged property can be treated as non-residential for Stamp Duty Land Tax (SDLT), rather than residential. The tax difference can be substantial. The issue usually turns on whether the property was “suitable for use as a dwelling” on the effective date of the transaction.

This area has become much harder for taxpayers after recent case law. A property will not usually fall outside the residential SDLT rules simply because it needs renovation, has been neglected, or cannot immediately be occupied without works. The current legal threshold is relatively high.

The Question

A buyer was considering purchasing a property for £500,000 and wanted to know whether SDLT could be calculated on a non-residential basis because of the property’s condition. On the figures discussed, the SDLT difference was significant:

• Residential SDLT: £37,500
• Non-residential SDLT: £14,500
• Difference: £23,000

The practical question was whether the property’s poor state was enough to mean it was not suitable for use as a dwelling at the date of purchase.

Nick’s Explanation

Nick’s explanation was that, following recent decisions, a property is generally still treated as suitable for use as a dwelling if it can be reused as a home. In anonymised form, his key point was that only properties with fundamental and effectively irreparable defects are likely to fall outside the residential definition.

He also suggested a cautious approach. In substance, his view was that if the buyer proceeds on the basis that the dwelling is residential and pays the higher SDLT amount, the buyer may later be able to seek a refund if later legal developments clearly support non-residential treatment, provided the statutory time limit is met.

The Law

SDLT is charged under the Finance Act 2003. Whether residential or non-residential rates apply depends on the nature of the property acquired.

For SDLT purposes, a building is generally 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 legislation is found in section 116 of the Finance Act 2003.

If a property is residential, the residential SDLT rate structure applies. If it is not residential, the non-residential or mixed-use rates may apply instead. Where the buyer already owns another dwelling and the conditions are met, the higher rates for additional dwellings may also apply.

The key phrase in many disputes is “suitable for use as a dwelling”. That is a factual and legal question assessed at the effective date of the transaction. The courts have made clear that the test is not whether the property is attractive, modern, mortgageable, or capable of immediate occupation without works. The question is whether it remains, in substance, a dwelling.

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.

Analysis

The issue can be analysed in stages.

1. Identify the property’s physical condition at completion.

   Evidence matters. This includes survey reports, photographs, contractor assessments, utility condition, structural issues, sanitation, kitchen and bathroom facilities, and whether the building remains recognisable as a dwelling.

2. Ask whether the defects are merely repairable or instead fundamental.

   A property does not usually cease to be a dwelling just because it needs substantial refurbishment. Missing fittings, dated interiors, damp, defective services, water damage, poor decorative condition, or even serious disrepair may still leave it suitable for use as a dwelling in SDLT terms.

3. Consider whether the defects are so serious that the building cannot realistically function as a dwelling at all.

   The cases now indicate that the bar is high. The buyer generally needs more than evidence that the property is not currently comfortable or ready for occupation. The defects usually need to be fundamental in nature.

4. Apply the legal test, not a practical or commercial test.

   It is not enough to say that a lender would not lend, that works are required before letting, or that the property is not fit for modern living standards. Those points may be relevant evidence, but they do not decide the SDLT question.

5. Compare the SDLT outcomes.

   On the figures provided, residential treatment produced SDLT of £37,500, while non-residential treatment would have produced £14,500. That is a £23,000 difference, so it is understandable why buyers look closely at this issue. But where the legal position is doubtful, the risk of underpaying SDLT, interest and possible penalties must be taken seriously.

On the facts described, Nick’s reasoning points towards residential treatment unless the property had defects of a truly fundamental and effectively irreparable kind. A property that can be restored and reused as a home will usually still be treated as residential.

Outcome

The practical conclusion is that a buyer should not assume that a derelict, damaged or vacant house automatically qualifies for non-residential SDLT rates. After Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, the threshold for showing that a property was not suitable for use as a dwelling is relatively high.

If the property remains, in substance, a dwelling that can be repaired and reused, residential SDLT treatment is likely to apply. In a cautious case, paying SDLT on the residential basis may be the safer course, with any refund position considered later if the law or evidence clearly supports that outcome.

Practical Steps

1. Obtain detailed evidence of condition at the completion date.

   A contemporaneous survey and photographs are usually essential.

2. Check whether the defects are structural or fundamental, rather than simply expensive to repair.

3. Review the SDLT calculation on both residential and non-residential bases.

   This helps quantify the risk and the amount at stake.

4. Consider whether the higher rates for additional dwellings also apply.

   That can materially increase the SDLT due.

5. If the position is uncertain, consider a cautious filing approach.

   Where appropriate, a buyer may decide to pay SDLT on the residential basis first and then review whether a refund claim is available within the statutory time limit if the legal position later becomes clearer.

6. Keep all supporting documents.

   Any later enquiry or refund claim will depend heavily on the documentary record.

Conclusion

A property in poor condition is not automatically non-residential for SDLT. The current case law sets a demanding test. Unless the building has defects so fundamental that it is not suitable for use as a dwelling at the effective date of purchase, residential SDLT treatment is likely to apply.

Legal References Used

• Finance Act 2003, section 116
• 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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