SDLT on Derelict Redevelopment Properties After Mudan Judgment
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Can you reclaim SDLT if a derelict property was uninhabitable when you bought it?
Introduction
Buyers sometimes ask whether Stamp Duty Land Tax (SDLT) can be reduced where a building was in very poor condition at the date of purchase. This usually comes up where the property was empty for years, had major structural problems, contained hazardous materials, or was later demolished or redeveloped.
The key issue is not simply whether the building looked derelict or needed major works. The legal question is whether, on the effective date of the transaction, the property was suitable for use as a dwelling for SDLT purposes. That test has become much stricter following recent case law.
The Question
A property development company bought a long-empty building at auction in 2023 for £756,000 and paid SDLT on the basis that it was residential property. At the time of purchase, the building was said to be derelict, structurally dangerous, affected by dry rot and wet rot, and contained asbestos. Planning permission has since been obtained to demolish the building and construct new apartments.
The question is whether those facts could support a claim that the building was not residential property for SDLT purposes, so that non-residential rates should have applied instead.
Nick’s Explanation
Nick’s core view was that a refund may be possible if the building was in such a ruinous condition that repair was not viable, because in that situation it may be arguable that the property was not suitable for use as a dwelling at the date of purchase.
He also highlighted the main difficulty: the legal test is now much narrower. In anonymised form, his point was that a property will only fall outside the residential rules if it had “fundamental defects which cannot be repaired”.
Using the figures provided, the SDLT comparison was:
- Residential SDLT: £47,980
- Non-residential SDLT: £27,300
- Potential difference: £20,680
That arithmetic shows why this issue matters, but the availability of any refund depends entirely on whether the legal test is met on the evidence.
The Law
SDLT is charged under the Finance Act 2003. Different rates apply depending on whether the subject matter of the transaction is residential property or non-residential property.
For these purposes, a building is generally treated as residential property if it is used or suitable for use as a dwelling, or is in the process of being constructed or adapted for such use.
The important disputes in this area usually concern the phrase “suitable for use as a dwelling”. HMRC and the courts look at the physical condition of the property at the effective date of the transaction. The buyer’s intentions are not decisive. So, a plan to demolish, redevelop, or refurbish does not by itself make the property non-residential.
The current legal position has been tightened significantly by Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799. In an uninhabitable or not suitable for use case, the condition thresholds are now relatively high following that decision. The Court of Appeal made clear that the test is not satisfied merely because a property is in serious disrepair, requires substantial renovation, lacks comfort, or would not be mortgageable. The focus is on whether there are fundamental defects that mean the building cannot be used as a dwelling in any real sense, and not simply defects that can be remedied by repair works.
Analysis
The analysis usually proceeds in five steps.
Identify the relevant date
The condition of the property must be judged at the effective date of the purchase, usually completion. Later works, later deterioration, later demolition, or later planning permission do not determine the SDLT position.
Ask whether the building was physically suitable for use as a dwelling at that date
This is an objective test. It is not enough that the building was unattractive, vacant, or in poor condition. Many old or neglected houses remain residential for SDLT purposes even if they need extensive refurbishment.
Consider whether the defects were fundamental and incapable of repair in practical terms
Problems such as rot, water ingress, asbestos, unsafe structure, missing services, or severe neglect may be relevant. But after Mudan, the question is whether those matters meant the building had fundamental defects which could not be repaired, rather than defects that were serious but remediable.
Ignore redevelopment intention as the main test
The fact that the buyer intended demolition and redevelopment, or later obtained planning permission for new apartments, does not itself change the SDLT classification. A dwelling can still be residential property even if the buyer never intended to live in it and intended to knock it down.
Assess the evidence
Success or failure usually turns on contemporaneous evidence. Auction particulars, legal pack documents, survey reports, structural engineer reports, photographs, asbestos reports, local authority notices, insurance evidence, and contractor assessments can all matter. The stronger the evidence that the building was beyond repair as a dwelling at the purchase date, the stronger the claim.
Applying those steps here, the facts described point to a potentially arguable claim, because the building was said to be empty for many years, structurally dangerous, affected by rot, and contaminated by asbestos. However, none of those facts automatically proves that the building was non-residential for SDLT purposes. A derelict dwelling can still be “suitable for use as a dwelling” in the legal sense if the defects were capable of being repaired.
That is why the post-Mudan threshold is important. The condition threshold is now relatively high. The claimant would need to show more than substantial dilapidation or major renovation need. The evidence would need to support the conclusion that the building had fundamental defects which could not be repaired, rather than a building that was simply uneconomic or unattractive to repair.
Outcome
A refund claim may be possible, but only if the evidence shows that, at the date of purchase, the building was not suitable for use as a dwelling under the now stricter legal test.
On the figures provided, if non-residential rates applied, the SDLT difference would be about £20,680. But whether that saving is actually available depends on proving that the property fell outside the residential definition. Given Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, that will often be difficult unless the defects were truly fundamental and not repairable.
Practical Steps
If you are assessing a similar case, the most useful next steps are:
- Obtain the auction particulars and full legal pack.
- Gather dated photographs showing the property’s condition at purchase.
- Collect any survey, structural engineer, asbestos, timber decay, or health and safety reports prepared around the transaction date.
- Identify whether there were any prohibition notices, dangerous structure notices, or insurance issues affecting use as a dwelling.
- Check whether the defects were capable of repair, or whether the evidence genuinely supports the stronger proposition that the building could not be repaired as a dwelling.
- Review the SDLT return and filing date to confirm whether an amendment or repayment route is still open, or whether any alternative claim route may be needed.
- Take specialist SDLT advice before submitting a reclaim, because unsupported “uninhabitable” claims are closely scrutinised.
Conclusion
A badly damaged or derelict building is not automatically non-residential for SDLT. The question is whether, at the purchase date, it was suitable for use as a dwelling. Following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, the threshold in uninhabitable cases is now relatively high. A claim is most likely to succeed only where the evidence shows fundamental defects that could not be repaired.
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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