Can you reclaim SDLT if a buy-to-let property was uninhabitable when you bought it?

Introduction

Buyers sometimes ask whether they can recover some Stamp Duty Land Tax (SDLT) if the property they bought was in such poor condition that it could not properly be lived in at completion. This issue usually arises where the dwelling had major defects such as structural instability, severe damp or mould, flooding, unsafe floors, a failed roof, or hazardous materials.

The key legal question is whether the property was still a “dwelling” for SDLT purposes on the effective date of the transaction. If it was not suitable for use as a dwelling at that point, it may fall to be taxed as non-residential property instead. That can reduce the SDLT due, especially where higher rates were paid.

However, this area has become much harder for taxpayers following recent case law. In particular, 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.

The Question

A purchaser bought a house as a buy-to-let investment and paid SDLT on the basis that it was residential property. After completion, extensive defects were identified, including serious rot to structural timbers, unsafe suspended floors, major water penetration, a roof in very poor condition, flooding in the basement, mould, asbestos, and the need for substantial rebuilding and repair works before occupation.

The purchaser wanted to know whether those defects meant the property was not fit for occupation at completion, so that it should be treated as non-residential for SDLT purposes and part of the tax reclaimed.

Nick’s Explanation

Nick’s view was that this type of claim used to look much stronger before the recent appellate decisions narrowed the scope for arguing that a damaged house is not residential property for SDLT.

In anonymised form, his explanation was that where a property has defects so serious that it is not suitable for use as a home at the effective date of the transaction, it may be treated as non-residential rather than residential. If that reclassification succeeds, the SDLT position can improve.

He also noted, however, that the law has moved against many taxpayers in this area, and that success now depends on meeting a demanding threshold. In substance, his advice was that a claim might still be arguable on very serious facts, but the prospects are no longer strong simply because a property needed major works.

The Law

SDLT is charged under the Finance Act 2003. The classification of land as residential or non-residential is critical because different rate structures apply.

The main statutory provisions are found in section 55 of the Finance Act 2003 and section 116 of the same Act.

Section 116(1) provides that “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. If a building is not used or suitable for use as a dwelling on the effective date, it may fall outside the residential definition.

The case law has focused on what “suitable for use as a dwelling” means. Earlier decisions sometimes allowed taxpayers to argue successfully that a badly damaged property was not suitable for use as a dwelling. But the courts have increasingly stressed that the test is objective, applied at the effective date, and not satisfied merely because the property is in poor condition or requires extensive repair.

The current leading authority in this area is Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799. That decision confirms that the threshold is relatively high. A property will not cease to be residential simply because it is dilapidated, defective, or temporarily unsafe in some respects. The question is whether, viewed realistically and objectively, it remained suitable for use as a dwelling at completion.

Analysis

There are several steps in analysing this kind of SDLT reclaim.

First, identify the relevant date. The test is applied at the effective date of the transaction, usually completion. The issue is not whether the property needed repair afterwards, but whether it was suitable for use as a dwelling at that exact point.

Second, look at the nature of the defects. Structural failure, dangerous floors, severe water ingress, roof collapse, flooding, mould, and asbestos are all relevant facts. But they do not automatically mean the building was not a dwelling for SDLT purposes. The court will ask whether the defects were so extreme that the property had crossed the line from damaged residential property into something no longer suitable for residential use.

Third, distinguish between serious disrepair and true unsuitability. Many houses are bought in poor condition and require substantial works. Even where occupation would be inconvenient, undesirable, or unsafe without repair, the property may still be classed as residential. The courts now require more than evidence of major renovation needs.

Fourth, consider the evidence available at completion. Useful evidence may include a survey, engineer’s report, photographs, contractor assessments, local authority records, and any contemporaneous evidence showing that the property could not lawfully or practically be occupied as a dwelling. Even then, the evidence must go to suitability for use as a dwelling, not just cost or scale of repair.

Fifth, be careful with points that do not decide the SDLT issue on their own. For example, the fact that a property was empty does not make it non-residential. Nor does the fact that it had lost an HMO licence. HMO licensing concerns a particular regulatory use. A building can fail HMO licensing standards and still remain a dwelling for SDLT purposes.

Applying those principles here, the defects described are serious and could support an argument that the property was beyond normal disrepair. Unsafe suspended floors, rotted structural beams, major roof failure, flooding, mould, and asbestos all point towards a very poor state of repair. That said, after Mudan, the legal hurdle is high. The fact that substantial works were needed, even essential works, does not necessarily mean the building was not suitable for use as a dwelling in the statutory sense.

So the case may be arguable, but it is no longer the kind of claim that can be treated as clearly strong merely because the property was in very bad condition.

Outcome

The practical conclusion is that a reclaim may still be worth considering where the property had extreme defects at completion, but the prospects are now materially weaker than they once were.

For a buyer in this position, the central point is this: a very damaged house is not automatically non-residential for SDLT. Following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, the threshold for proving that a property was not suitable for use as a dwelling is relatively high.

In short, a claim is possible, but it will usually depend on unusually strong contemporaneous evidence showing that the property had genuinely ceased to be suitable for residential use at completion.

Practical Steps

If you are assessing a possible SDLT reclaim on this basis, the sensible next steps are:

• Obtain the completion date and SDLT return details.
• Gather all contemporaneous evidence from around completion, including surveys, engineer reports, photographs, quotations, invoices, and correspondence.
• Separate defects that show disrepair from defects said to make the building objectively unsuitable for use as a dwelling.
• Check whether there is evidence that occupation was impossible or genuinely unrealistic at completion, rather than merely difficult or inadvisable.
• Do not rely solely on the fact that the property was vacant, unmortgageable, stripped out, or in need of renovation.
• Do not assume that HMO licensing issues determine SDLT classification.
• Review the claim against the reasoning in Mudan before deciding whether it is worth pursuing.
• Check time limits for amending or reclaiming SDLT, as the procedural route can matter.

Conclusion

A buyer can sometimes reclaim SDLT where a property was so defective at completion that it was not suitable for use as a dwelling. But that is now a difficult argument. The courts have set a relatively high threshold, and many badly damaged houses will still count as residential property for SDLT. The question is not whether major repairs were needed, but whether the building had truly ceased to be suitable for residential use on the effective date of the purchase.

Legal References Used

• Finance Act 2003, section 55
• 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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