SDLT on Uninhabitable Properties after Mudan v HMRC
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Can you claim non-residential SDLT rates because a property is uninhabitable?
Introduction
Buyers often ask whether a run-down house can be treated as “not suitable for use as a dwelling” for Stamp Duty Land Tax purposes. If it can, the purchase may be taxed at non-residential rates instead of residential rates. That can make a substantial difference, especially where the higher rates for additional dwellings would otherwise apply.
The difficulty is that this is now a much harder argument to make than it used to be. A property does not qualify simply because it needs major works, refurbishment, or modernisation. The legal threshold for saying a building is 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 prospective buyer asked how they could show that a property was currently uninhabitable and needed extensive work before it could be rented out, with a view to claiming a Stamp Duty Land Tax saving.
In general terms, the scenario was this: the buyer was considering purchasing a dwelling that required a full refurbishment. They wanted to know what evidence would be needed to prove that the property was not habitable at the effective date of the transaction, so that non-residential SDLT treatment might apply.
Nick’s Explanation
Nick’s explanation was that if a property is genuinely “not suitable for use as a dwelling” at the relevant date, it may fall outside the residential SDLT rules and be charged at non-residential rates instead.
He also explained that the position has become much stricter. In anonymised form, his key point was:
If a property merely needs substantial repairs or refurbishment, that will usually not be enough. The current approach is far narrower and focuses on very serious defects. The threshold is now much higher than many buyers expect.
He further indicated that a complete refurbishment does not automatically mean the property qualifies. In the underlying exchange, once the buyer understood the criteria, they accepted that the property they were considering would probably not meet the test.
The Law
SDLT is charged under the Finance Act 2003. Whether residential or non-residential rates apply depends on the nature of the land at the effective date of the transaction.
The key statutory rule is that land is residential property if it consists of or includes:
- a building that is used or suitable for use as a dwelling, or
- land that forms part of the garden or grounds of such a building, or
- an interest or right over land that subsists for the benefit of such a building.
The central question in condition cases is therefore whether the building was “suitable for use as a dwelling” on completion.
That question has been considered in a number of SDLT cases. The modern approach is not satisfied merely because a property is in poor condition, lacks modern fittings, or requires extensive renovation. The courts have increasingly focused on whether the building still has the basic character of a dwelling and whether any defects are so fundamental that it cannot realistically be regarded as suitable for residential use.
In an uninhabitable or not suitable for use case, the condition threshold is now relatively high following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799.
Analysis
The analysis usually works in five steps.
Identify the relevant date
The condition of the property is judged at the effective date of the transaction, usually completion. It is not enough that the buyer plans to strip it out afterwards or that it will be empty pending works.
Ask whether the building still has the character of a dwelling
A house can still be a dwelling even if it is derelict, outdated, damp, unsafe in some respects, or in need of complete refurbishment. The fact that it is not currently attractive, rentable, mortgageable, or comfortable does not by itself mean it is unsuitable for use as a dwelling.
Consider the seriousness of the defects
The important question is whether the defects are truly fundamental. Missing kitchens, old bathrooms, damaged plaster, defective electrics, damp, broken windows, failed boilers, or a need for full renovation will often still fall short. The present legal approach sets a high bar.
Distinguish repairable disrepair from something more extreme
If the building can be repaired and restored to use as a home, that tends to point towards it still being residential property for SDLT purposes. The more the case looks like a repair and refurbishment project, however extensive, the weaker the argument for non-residential treatment.
Test the evidence against the legal threshold
Evidence such as survey reports, photographs, contractor opinions and local authority records may help prove the physical condition. But evidence only helps if the underlying facts are strong enough in law. Proof of severe disrepair is not the same as proof that the building was not suitable for use as a dwelling.
That is why many claims fail. Buyers often focus on how much money must be spent, or on whether the property could immediately be rented out. Those are practical questions, but they are not the legal test. A property can be impossible to let in its current state and still be treated as residential for SDLT.
Following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, anyone arguing that a dwelling was not suitable for use must now recognise that the courts have adopted a relatively demanding standard. A simple “full refurbishment required” case will usually be difficult.
Outcome
The practical conclusion is that a property needing complete refurbishment will not automatically qualify for non-residential SDLT rates. In many cases, it will not qualify at all.
If the property is still recognisable as a dwelling and the defects are repairable, even if the works are extensive and expensive, residential SDLT treatment is likely to apply. The fact that the property is currently not fit for rental use is not enough on its own.
Practical Steps
If you are assessing whether a property may fall outside the residential SDLT rules, the sensible next steps are:
- obtain a full survey or structural report dealing with the condition at completion;
- keep dated photographs and any contemporaneous evidence showing the state of the building;
- identify whether the defects are truly fundamental or simply extensive but repairable disrepair;
- separate issues of habitability, mortgageability and rental readiness from the narrower SDLT test of suitability for use as a dwelling;
- review the case law carefully, especially the current high threshold reflected in Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799;
- make the SDLT analysis by reference to the effective date of the transaction, not by reference to planned future works.
If, after reviewing the evidence, the case is really that the property needs major renovation but remains repairable as a house, the safer conclusion is usually that residential SDLT rates apply.
Conclusion
A property is not treated as non-residential for SDLT just because it is in very poor condition or needs a full refurbishment. The present legal test is much stricter. After Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, only unusually serious condition cases are likely to succeed.
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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