Can you claim the non-residential SDLT rate because a property was uninhabitable?

Introduction

People often ask whether Stamp Duty Land Tax (SDLT) can be reduced if a property was in very poor condition when it was bought. A common argument is that the dwelling was not suitable for use as a residence on the effective date of the transaction, so the purchase should be treated as non-residential or mixed-use for SDLT purposes.

This area has become much harder for taxpayers after recent case law. In particular, the threshold for showing that a dwelling was truly not suitable for use as a residence is now relatively high following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799.

The Question

The issue is whether a buyer who purchased a property in very poor condition can argue that it was uninhabitable at completion and therefore should not be taxed as a residential property for SDLT purposes.

Typically, this kind of question arises where the property may have had serious defects, lacked functioning facilities, required major renovation, or could not realistically be occupied without substantial works.

Nick’s Explanation

Nick’s explanation, put into general terms, is that poor condition on its own is usually not enough. The legal test is not whether the property was unpleasant, run-down, or in need of refurbishment. The question is whether, at the effective date of the transaction, the building was suitable for use as a dwelling.

In anonymised form, his reasoning can be summarised like this: if the property still had the character of a dwelling, HMRC and the courts will often treat it as residential even where substantial repairs are needed. The fact that a buyer intends to strip it out, modernise it, or carry out major works does not by itself change the SDLT position.

He also points to the importance of recent authority. Following Mudan, the bar for proving unsuitability is now high. The defects usually need to go beyond ordinary disrepair, dated condition, missing fittings, or the need for renovation. The condition must be serious enough that the property cannot properly be regarded as suitable for residential use at the relevant date.

The Law

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

The key statutory provisions are in section 116 Finance Act 2003. Broadly:

• “Residential property” includes 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.
• Property that is not residential property is generally treated as non-residential property.

In disputes about derelict or damaged buildings, the central issue is usually whether the building was “suitable for use as a dwelling” on the effective date of the transaction.

The courts have considered this phrase in a number of cases. Recent authority has made clear that the test is an objective one. It is not enough that the property was inconvenient, uncomfortable, unattractive, or expensive to repair. The question is whether it remained suitable for use as a dwelling in the relevant legal sense.

For uninhabitable or not suitable for use arguments, the condition threshold is now relatively high following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799.

Analysis

When applying the rules, it helps to work through the issue step by step.

First, identify the property as it existed on the effective date of the transaction. SDLT looks at the state of the property at that point, not after later works have started.

Second, ask whether there was a building with the character of a dwelling. If the property was originally built and used as a house or flat, that usually points towards residential treatment unless the condition was so severe that it was no longer suitable for residential use.

Third, consider the actual defects. Relevant points may include whether the property had or lacked basic services, sanitation, water, electricity, heating, a usable kitchen, a usable bathroom, weatherproofing, structural integrity, or safe access. Even so, no single missing feature is automatically decisive.

Fourth, distinguish between severe unsuitability and ordinary renovation. A property needing rewiring, replastering, damp treatment, a new kitchen, a new bathroom, new windows, or general modernisation may still be residential for SDLT. The same is often true where the property is vacant, neglected, or stripped back for refurbishment.

Fifth, consider whether the defects were so fundamental that the property could not sensibly be occupied as a dwelling at all. That is the area where a taxpayer may have an argument. But after Mudan, the courts are likely to scrutinise such claims closely.

Sixth, intention is usually secondary. A buyer may have intended a full redevelopment or may never have planned to live there in its existing state. That does not determine the SDLT classification. The focus remains on the objective condition of the property at the relevant time.

In practical terms, many claims fail because the property was still recognisably a dwelling despite being in poor or even very poor condition. The modern position is less favourable to taxpayers than some earlier expectations suggested.

Outcome

The practical answer is that a property will not usually qualify for non-residential SDLT rates just because it was dilapidated or required substantial renovation. To succeed, the buyer generally needs to show that, at the effective date, the property was not suitable for use as a dwelling in a much stronger sense.

Following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, the threshold for proving this is relatively high.

Practical Steps

If you are assessing whether a past purchase might support this argument, the sensible next steps are:

• Review the condition of the property on the effective date, not after works began.
• Gather contemporaneous evidence such as the survey, valuation, photographs, completion statements, contractor reports, and mortgage material.
• Check whether the defects went beyond disrepair and amounted to true unsuitability for residential use.
• Compare the facts carefully against the wording of section 116 Finance Act 2003 and the recent case law.
• Be cautious about claims based only on refurbishment costs, vacancy, missing décor, or a plan to redevelop.
• If a refund claim has already been made or is being considered, review it in light of Mudan before proceeding further.

Conclusion

A run-down property is not automatically non-residential for SDLT. The real question is whether it was suitable for use as a dwelling on the effective date. After Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, proving that it was not suitable is now a demanding test.

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.

See all questions and answers categorized in this sitemap. Or use Google site search below.