Can a property qualify as not suitable for use for SDLT?

Introduction

Many buyers ask whether a property can be treated as not suitable for use as a dwelling for Stamp Duty Land Tax purposes. This matters because, if a building is genuinely not suitable for use as a dwelling at the effective date of the transaction, the residential SDLT rules may not apply in the usual way. In some cases that can affect the rate of tax charged.

This is a fact-sensitive area. The legal threshold is now relatively high, especially after Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799. A property does not fall outside the dwelling rules simply because it needs repair, refurbishment or modernisation.

The Question

A buyer wants to know whether a property they are purchasing can be treated as not suitable for use as a dwelling because of its condition at the time of purchase. The issue is whether the state of repair is serious enough to take the property outside the normal residential SDLT treatment.

Nick’s Explanation

Nick’s explanation, put into general terms, is that the test is strict and turns on the actual condition of the property at the effective date of the transaction. The question is not whether the property is unattractive, dated, vacant, in disrepair or expensive to fix. The question is whether it is truly unsuitable for use as a dwelling at that point in time.

In anonymised form, his reasoning can be summarised like this: a property will usually still count as a dwelling if it retains the basic character of a home, even if significant works are needed. Missing fittings, poor decorative condition, damp, old services or a need for extensive renovation will not automatically be enough. The threshold for saying a property is not suitable for use is now high.

That approach is consistent with recent case law and HMRC’s view that the test is practical and objective. It focuses on whether the building can be used as a residence, not whether it is comfortable, mortgageable or ready for immediate occupation to a modern standard.

The Law

The key SDLT legislation is found in the Finance Act 2003. Whether property is residential matters because residential property is taxed under a different SDLT regime from non-residential or mixed-use property.

For SDLT purposes, 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. The legislation looks at the position at the effective date of the transaction, which is usually completion.

The central legal question in these cases is whether the property was “suitable for use as a dwelling” at that date. The courts have considered this in a number of decisions. The recent and important authority is Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, which confirms that the condition threshold is relatively high in uninhabitable or not suitable for use arguments.

Analysis

The analysis usually works in the following stages.

First, identify the relevant date. The condition of the property is judged at the effective date of the transaction, usually completion. Earlier marketing particulars, later building works, or what the buyer intended to do after purchase may provide context, but they do not change the legal test.

Second, examine the physical condition of the building. Relevant factors may include whether the property has functioning or potentially usable kitchen and bathroom facilities, water, electricity, sanitation, weatherproofing, safe access and the general structure expected of a dwelling.

Third, ask whether the defects mean the property is truly unsuitable for residential use, rather than merely in poor condition. There is an important distinction between:

• a property that needs repair, refurbishment or updating; and
• a property that has deteriorated so far that it is no longer suitable for use as a dwelling at all.

Fourth, apply the high threshold confirmed by the courts. Following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, the courts have made clear that the bar is relatively high. A property will not usually fall outside the dwelling definition just because it lacks modern standards of comfort, requires major expenditure, or is not currently occupied. Serious disrepair is not necessarily enough if the building still objectively remains a dwelling.

Fifth, consider the evidence. The strongest evidence usually includes contemporaneous photographs, survey reports, contractor reports, local authority material where relevant, and completion-date evidence showing the actual state of the building. Assertions made after the event carry less weight if they are not supported by objective evidence.

Examples that often do not, by themselves, prove unsuitability include:

• dated interiors;
• non-working heating;
• damp or mould;
• old wiring or plumbing;
• an unusable or missing fitted kitchen in circumstances where the building still plainly functions as a house or flat;
• the property being empty for a long time;
• the property being difficult to mortgage.

By contrast, a buyer arguing that a property was not suitable for use as a dwelling would usually need evidence of much more fundamental problems affecting its essential character or practical residential use at the effective date.

Outcome

The practical conclusion is that a property will usually still be treated as residential for SDLT unless its condition is exceptionally poor at completion. The test is not whether the property is habitable in an everyday sense or ready for comfortable occupation. The test is whether it is suitable for use as a dwelling in the legal sense, and that threshold is now relatively demanding.

In most repair and renovation cases, the property remains a dwelling for SDLT purposes. Buyers should be cautious before assuming that disrepair, missing fixtures or renovation needs will justify non-residential treatment.

Practical Steps

If you are assessing whether a property was not suitable for use as a dwelling, the sensible next steps are:

• identify the effective date of the transaction;
• gather contemporaneous photographs and videos showing the property’s condition at that date;
• obtain the survey, valuation and any contractor reports prepared close to completion;
• separate essential structural or functional defects from ordinary disrepair or outdated features;
• compare the facts carefully against the stricter approach confirmed in Mudan;
• take specialist SDLT advice before filing or amending a return based on a not suitable for use argument.

Where the facts are borderline, the quality of the evidence is often decisive.

Conclusion

A property is not treated as outside the dwelling rules simply because it is run-down or needs major works. For SDLT, the legal threshold for saying a property is not suitable for use as a dwelling is relatively high, and it is now particularly important to apply the approach confirmed in Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799.

Legal References Used

• Finance Act 2003
• 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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