SDLT Treatment of Severely Damaged Houses After Mudan Judgment
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Can a Property Count as Not Suitable for Use as a Dwelling for SDLT if It Needed Major Repairs?
Introduction
Buyers often ask whether Stamp Duty Land Tax (SDLT) should be reduced because a property was in very poor condition when they bought it. A common argument is that the dwelling was not suitable for use as a dwelling on the purchase date, which can affect the SDLT treatment. This issue usually comes up where the property had leaks, rotten structural elements, an old boiler, an unusable kitchen, or required a full refurbishment.
The difficulty is that the legal threshold is now quite high. A property does not become non-residential for SDLT just because it was run down, unsafe in parts, or needed extensive works. The question is whether, at the effective date of the transaction, the building was truly unsuitable for use as a dwelling under the legal test applied by the courts.
The Question
A buyer purchased a house that was in very poor condition. The kitchen had no worktop, the cooker was not working, there were serious leaks affecting the kitchen and another area near a window, the roof and gutters needed repair, the boiler was very old and had to be replaced, and rotten beams beneath the kitchen floor had to be changed because they were dangerous. The buyer says the renovation was effectively back to brick and has survey material and some building invoices.
The issue is whether those facts are enough to show that, on completion, the property was not suitable for use as a dwelling for SDLT purposes.
Nick’s Explanation
Nick’s reasoning, put into public-facing form, is that extensive disrepair and the need for major refurbishment do not automatically mean a property was unsuitable for use as a dwelling at the relevant time. The key question is the condition of the property on the effective date of the purchase, viewed against the legal test in the SDLT legislation and the case law.
In substance, his explanation is that evidence such as a survey, photographs, and invoices can help show the condition of the property, but the tribunal or court will look closely at whether the defects actually prevented normal residential occupation. If the building still retained the basic character of a dwelling, the fact that the buyer later stripped it out and replaced large parts of it will not by itself decide the issue.
That approach is especially important now because the condition threshold in uninhabitable or not suitable for use cases is relatively high following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799.
The Law
SDLT is charged under the Finance Act 2003. Whether the higher residential rates or the ordinary residential rules apply depends first on whether the subject matter of the transaction is residential property.
Section 116 of the Finance Act 2003 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;
- land that forms part of the garden or grounds of such a building; and
- an interest or right over land that subsists for the benefit of such a building or land.
In poor-condition cases, the disputed phrase is usually “suitable for use as a dwelling”. The test is applied at the effective date of the transaction, usually completion. The question is not whether the property was attractive, modern, mortgageable on ordinary terms, or in good repair. It is whether it was suitable for use as a dwelling in the condition it was in at that time.
The courts have repeatedly treated this as a practical, fact-sensitive question. The focus is on the physical state of the property, not the buyer’s intention to renovate it. A building may still be suitable for use as a dwelling even if it lacks modern fittings, requires substantial repair, or is unpleasant to live in.
Following 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 now relatively high. The courts have made clear that serious disrepair is not enough unless the defects go far enough to prevent the property from being used as a dwelling in a real and practical sense.
Analysis
Applying those rules step by step:
The starting point is that a house is ordinarily residential property. A buyer arguing otherwise must show that, on completion, it was not suitable for use as a dwelling.
The defects described are serious: leaks, wet walls, roof and gutter problems, a failed or obsolete boiler, dangerous rotten beams under part of the floor, an unusable cooker, missing kitchen worktop, and a substantial strip-out after purchase.
Even so, each defect must be tested against the legal standard. Missing or outdated kitchen items do not usually make a building unsuitable as a dwelling. A non-working cooker or absent worktop may show poor condition, but many dwellings remain dwellings despite lacking complete or modern kitchen fittings.
Likewise, an old boiler needing replacement does not necessarily make a property unsuitable for use as a dwelling. The same is true of a roof needing repair or water ingress, unless the problem was so severe that occupation as a dwelling was not realistically possible.
The strongest point here is likely to be the structural danger from rotten beams beneath the kitchen floor, together with active leaks and significant water penetration. If the evidence shows that part of the structure was unsafe and the property could not be occupied as a dwelling without immediate major works, that may support the argument.
However, the fact that the buyer carried out a back-to-brick refurbishment after completion is not decisive. Many buyers choose to renovate heavily even where the building was still legally a dwelling when purchased.
The quality of the evidence matters. A homebuyer report may help if it clearly identifies conditions existing at completion and explains their seriousness. Photographs taken at or before completion are often important. Builder invoices are usually less persuasive on their own because they show what was done later, not necessarily what the legal condition was on the effective date.
After Mudan, a tribunal is likely to ask whether the property still had the basic features and character of a dwelling despite the disrepair. If the answer is yes, the claim is harder to sustain.
On these facts alone, there is certainly evidence of major disrepair, but not every item points clearly to legal unsuitability for use as a dwelling. The argument is possible, but it is not straightforward, and the current case law means the bar is high.
Outcome
The practical conclusion is that severe disrepair and extensive renovation costs do not automatically mean a property was not suitable for use as a dwelling for SDLT purposes. The buyer would need strong contemporaneous evidence showing that, at completion, the defects were so serious that the property was not realistically capable of residential occupation.
Given the current legal position, especially after Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, cases based only on poor condition, outdated fittings, leaks, and major refurbishment are difficult unless the evidence shows a genuinely high level of physical unfitness.
Practical Steps
If you are assessing a similar case, it is sensible to gather and review the following:
- the survey or homebuyer report in full, especially any findings on structural safety, water ingress, sanitation, heating, and habitability;
- dated photographs and videos showing the condition at or before completion;
- completion statements, sales particulars, and correspondence describing the property’s condition at the time of sale;
- contract papers and replies to enquiries, if they mention defects or services not working;
- builder or engineer evidence explaining whether the defects made occupation unsafe or impossible at the relevant date;
- invoices and schedules of works, used carefully to support the condition evidence rather than as the main proof.
The key question to put to the evidence is not simply “Was the property in bad condition?” but “Was it unsuitable for use as a dwelling on completion under the SDLT test?”
Conclusion
A property can be in very poor condition and still count as residential property for SDLT. To show otherwise, the buyer must meet a relatively high threshold. Serious leaks, rotten structural elements, a failed kitchen, and a full refurbishment may help, but the decisive issue is whether the building was truly unsuitable for use as a dwelling at the effective date of the transaction.
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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