SDLT On Derelict Or Unsafe Residential Property
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Can you reclaim SDLT if a property was not suitable for use as a dwelling at purchase?
Introduction
Many buyers ask whether Stamp Duty Land Tax (SDLT) was overpaid where a property looked like a house or flat, but was in such poor condition at completion that it could not properly be used as a dwelling. This issue matters because residential SDLT rates can be higher than the rates that apply where a building is not suitable for use as a dwelling on the effective date of the transaction.
The difficulty is that the legal test is stricter than many people expect. Serious disrepair, a failed mortgage valuation, damp, mould, roof leaks, unsafe electrics, or the need for extensive renovation do not automatically mean the property falls outside the residential SDLT rules. 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 Question
A buyer purchased a dwelling that was said to be in very poor condition at the time of acquisition. The reported problems included water ingress, damp, mould, heating issues, electrical safety concerns, and the need for extensive works before the property could be occupied safely or let out. There was also evidence said to show that the property was not mortgageable and that the parties had documented the extent of the repairs in pre-completion contractual papers.
The buyer wanted to know whether the SDLT return should have treated the property as non-residential, or otherwise outside the residential rates, because the building was allegedly not habitable at the effective date of the transaction.
Nick’s Explanation
Nick’s initial view was that, on the facts presented to him, the case looked strong. In anonymised form, his reasoning was that a property with serious defects and clear evidence of unsafe or unusable living conditions may have been wrongly treated as residential for SDLT purposes.
He also noted a common practical problem: conveyancing solicitors often take a cautious approach and submit the SDLT return on the basis that a building designed as a home should be treated as residential regardless of condition. That approach can sometimes be correct, but it is not always the end of the matter.
The key point in Nick’s explanation was that the answer depends on evidence showing the property’s actual condition at the effective date of the transaction. He identified material such as:
- survey reports and valuation reports;
- photographs and video evidence;
- repair schedules and cost estimates;
- the contract, transfer, SDLT filing, and completion papers;
- documents showing the nature and extent of the defects existing at completion.
That said, the legal position now needs to be read in light of later authority. A property is not taken outside the residential SDLT rules merely because it needs major works. The defects must be serious enough that, viewed objectively at the effective date, the building was not suitable for use as a dwelling.
The Law
SDLT is charged under the Finance Act 2003. For these cases, the central issue is whether the subject matter of the transaction was “residential property” at the effective date.
Under section 116 of the Finance Act 2003, property is residential property if it consists of:
- 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; or
- an interest or right over land that subsists for the benefit of such a building or land.
The crucial words are “suitable for use as a dwelling”. The test is applied at the effective date of the transaction, usually completion. The question is objective. It is not enough that the buyer intended to renovate, live in it later, or let it after repairs. Nor is it enough that the property was unattractive, dated, or expensive to fix.
Case law has developed the meaning of suitability for use as a dwelling. The courts have generally treated this as a practical and realistic test, looking at the physical state of the property at the relevant date.
Importantly, in Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, the Court of Appeal confirmed that the threshold is relatively high in “uninhabitable” cases. A property may still be suitable for use as a dwelling even if it has serious defects, requires substantial repairs, or is not immediately comfortable or mortgageable. The fact that works are needed does not by itself prevent the property from being residential property for SDLT purposes.
Analysis
The right way to analyse this kind of case is step by step.
Identify the effective date
The condition of the property must be tested at the effective date of the transaction, usually the date of completion. Earlier negotiations, draft agreements, or plans for future works may help explain the background, but they do not replace the statutory test at completion.
Ask whether the building was objectively suitable for use as a dwelling
This is the core question. A building can still be suitable for use as a dwelling even if it has damp, leaks, defective heating, outdated electrics, or requires extensive refurbishment. The court will look at whether the property retained the basic character and functionality of a dwelling.
Distinguish serious disrepair from true unsuitability
There is a difference between a property that is unpleasant, risky, or costly to repair, and one that is truly not suitable for residential use. Following Mudan, the bar is now relatively high. Evidence must show more than inconvenience or substantial renovation needs.
Consider the type of evidence available
Useful evidence may include survey findings, photographs taken at completion, contractor reports, valuation comments, and records showing whether there were functioning kitchen, bathroom, sanitation, water, electricity, weatherproofing, and safe access arrangements. However, a lender’s refusal to lend is not conclusive. Mortgageability and SDLT classification are different questions.
Ignore factors that do not directly answer the statutory test
The fact that the buyer intended to carry out major works, negotiated a delayed completion, or documented the repair scope in a side agreement does not itself prove that the property was not suitable for use as a dwelling. Likewise, the fact that the property was not yet suitable for buy-to-let standards is a separate issue. Rental readiness is not the SDLT test.
Compare the facts with the current legal threshold
If the building still had the essential nature of a dwelling at completion, HMRC is likely to argue that it remained residential property. To succeed, the buyer would usually need to show defects so serious that the property had crossed the line from poor-condition dwelling into a building not suitable for use as one.
On the anonymised facts described, there are features that could support an argument for unsuitability: water ingress, possible electrical danger, damp and mould, and evidence of substantial remedial works. But those features do not guarantee success. After Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, the condition thresholds are now relatively high in uninhabitable or not suitable for use cases.
In practice, the strongest cases tend to involve defects that go to the basic ability to occupy the building as a dwelling at all, rather than cases where the property is simply derelict, unsafe in some respects, or in need of major renovation.
Outcome
A buyer in this situation may have grounds to review the SDLT treatment, but should not assume that major disrepair automatically means the property was non-residential for SDLT purposes. The correct conclusion depends on whether the evidence shows that, at completion, the building was not suitable for use as a dwelling within section 116 of the Finance Act 2003.
Because of Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, the legal threshold is now relatively high. Many properties that need extensive works will still be treated as residential property for SDLT.
Practical Steps
If you are assessing a possible SDLT reclaim on this basis, the practical steps are:
- obtain the SDLT return, SDLT5 certificate, contract, transfer, and completion statement;
- gather dated photographs and videos showing the property’s condition at or very close to completion;
- obtain survey reports, valuation reports, and contractor assessments prepared at the time;
- identify defects affecting core residential use, such as weatherproofing, sanitation, water, power, safe access, kitchen, bathroom, and structural safety;
- separate evidence about basic habitability from evidence about desirability, mortgageability, or rental standard compliance;
- review the facts specifically against section 116 Finance Act 2003 and the current case law, especially Mudan;
- check time limits for amending or reclaiming SDLT, as delay can be critical.
Anyone considering a reclaim should focus on contemporaneous evidence. Later repair invoices can help show the scale of the problem, but they are usually less persuasive than documents proving the state of the property on the effective date itself.
Conclusion
If a property was genuinely not suitable for use as a dwelling at completion, the SDLT return may have been wrong. But the legal test is demanding, and after Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, not every severely damaged or unmortgageable property will qualify. The real question is whether the building had ceased, in practical terms, to be suitable for use as a dwelling on the effective date.
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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