Can you claim SDLT relief if a buy-to-let property was uninhabitable when bought?

Introduction

Many buyers ask whether they can reduce or reclaim Stamp Duty Land Tax (SDLT) if a property was in such poor condition at completion that it was not suitable for use as a dwelling. This issue often comes up with buy-to-let purchases, especially where the property needed major works after completion.

The key point is that SDLT looks at the condition of the property on the effective date of the transaction, usually completion. A property does not stop being “residential” just because it is run down or needs refurbishment. The legal threshold for showing that a building was not suitable for use as a dwelling is now relatively high, particularly following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799.

The Question

A buyer purchased a low-value property as a buy-to-let investment and wants to know whether an “uninhabitable” argument could support an SDLT refund or different SDLT treatment. The concern is whether the condition of the property at purchase was so poor that it should not have been treated as residential property for SDLT purposes.

Nick’s Explanation

Nick’s response, in substance, was that this is the sort of case that may be worth reviewing, but any claim based on the property being uninhabitable must be approached carefully. The important issue is not whether the property was unattractive, outdated, or in need of repair, but whether, at completion, it truly failed the legal test of being suitable for use as a dwelling.

In anonymised terms, Nick’s view can be summarised like this: a buyer may think a property was “uninhabitable”, but the SDLT test is stricter than many people expect. The fact that a property was bought to renovate, or could not immediately be let out without works, does not by itself mean it was non-residential for SDLT.

The Law

SDLT is charged under the Finance Act 2003. The distinction between residential and non-residential property is central to the calculation.

Under section 116 of the Finance Act 2003, property is residential property if it is:

• used as a dwelling,
• suitable for use as a dwelling, or
• in the process of being constructed or adapted for such use.

If a building is not suitable for use as a dwelling at the effective date of the transaction, it may fall outside the residential rules. That can affect the SDLT rates and, in some cases, whether a refund claim is possible if the tax was calculated on the wrong basis.

However, the courts have made clear that “not suitable for use as a dwelling” is a narrow category. A property can still be residential even if it is dilapidated, lacks modern facilities, or requires substantial repair.

The leading modern authority is Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799. That case confirms that the threshold is relatively high. The question is not whether the property was comfortable, mortgageable, lettable, or compliant with modern expectations. The question is whether, viewed realistically at the relevant date, it was suitable for use as a dwelling at all.

Analysis

When looking at an “uninhabitable” SDLT argument, the analysis usually works in stages.

First, identify the exact condition of the property at completion. Evidence matters. This may include:

• survey reports,
• auction pack documents,
• photographs and videos taken before or at completion,
• builder or contractor reports,
• invoices for immediate remedial works,
• local authority notices, if any,
• utility status, such as whether water or electricity was disconnected,
• evidence of structural failure, contamination, or dangerous conditions.

Second, separate serious defects from ordinary disrepair. A property may still be suitable for use as a dwelling even if it has:

• an old kitchen or bathroom,
• damp,
• damaged plaster,
• worn flooring,
• outdated electrics,
• heating issues,
• a need for refurbishment before letting.

Those features often support a renovation case, but not necessarily an SDLT non-residential case.

Third, ask whether the defects meant the building could not realistically function as a dwelling on the completion date. The cases suggest that the bar is high. Examples that may carry more weight include:

• severe structural instability,
• major fire damage,
• conditions making occupation unsafe in a fundamental way,
• the absence of basic features combined with wider serious defects,
• a property stripped back to such an extent that it no longer functioned as living accommodation.

Fourth, focus on the legal test rather than valuation or lending language. Terms such as “not mortgageable”, “derelict”, or “uninhabitable” in estate agency or survey wording do not decide the SDLT position. The tribunal and courts look at the statutory test in section 116, not labels used in commercial documents.

Fifth, consider the effect of Mudan. Following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, it is harder to argue that a property was not suitable for use as a dwelling unless the facts are genuinely extreme. The court’s approach reinforces that many properties needing extensive work will still count as residential for SDLT.

In a typical buy-to-let purchase at a modest price, the price itself does not prove anything. A low purchase price may reflect location, market conditions, tenant issues, title problems, or disrepair. It does not automatically show that the building fell outside the residential definition.

Outcome

The practical conclusion is that an SDLT refund or reclassification based on “uninhabitable” condition is only likely to succeed where the property’s condition at completion was genuinely severe. A property needing renovation, modernisation, or even substantial repair will often still be treated as residential property.

Because the condition threshold is now relatively high following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, many claims that might once have seemed arguable are now much weaker unless supported by strong factual evidence.

Practical Steps

If you want to assess whether an SDLT claim is realistic, the next steps are usually:

• obtain the completion date and SDLT filing position,
• collect all contemporaneous evidence showing the property’s condition at that date,
• review surveys, photographs, invoices, and any safety or enforcement notices,
• identify whether the defects were cosmetic, repair-related, or fundamentally prevented use as a dwelling,
• compare the facts against the stricter post-Mudan case law threshold,
• take advice on whether the facts support a genuine section 116 argument.

If the evidence mainly shows disrepair and a need for refurbishment before letting, the claim is unlikely to be strong. If the evidence shows major structural danger or a complete loss of basic residential function, the position may be more arguable.

Conclusion

You cannot assume that a run-down buy-to-let property was non-residential for SDLT just because it needed major works. The legal test is whether it was suitable for use as a dwelling at completion, and that threshold is now relatively demanding. After Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, only stronger fact patterns are likely to support an “uninhabitable” SDLT claim.

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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