Can supporting evidence help with an SDLT claim for an uninhabitable property?

Introduction

People often ask whether photographs, surveys, contractor reports and other documents can help them claim a lower rate of Stamp Duty Land Tax (SDLT) on the basis that a property was not suitable for use as a dwelling when they bought it. This question usually arises where a buyer completed a purchase, paid SDLT, and later wondered whether the property’s condition at the effective date of the transaction could support a refund claim.

The key point is that evidence matters, but the legal test is strict. It is not enough that a property needed repair, renovation or modernisation. The issue is whether, at the relevant date, the building was truly unsuitable for use as a dwelling under the SDLT rules. Following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, the threshold for showing that a property was uninhabitable is now relatively high.

The Question

A buyer asked whether a set of supporting documents and identification material relating to a residential purchase could be reviewed to decide what was most suitable for an SDLT position. In substance, the issue was whether the available evidence could support an argument that the property was not suitable for use as a dwelling at the time of purchase.

Nick’s Explanation

Nick’s explanation, put into general terms, was that the documents should be assessed to identify the strongest evidence, but only evidence going to the property’s actual condition at the effective date of the transaction will carry real weight.

In anonymised form, his reasoning can be summarised like this:

• the most useful material is usually contemporaneous evidence from around the completion date;
• stronger evidence includes a survey, structural report, environmental report, contractor assessment, lender retention evidence, valuation comments, and dated photographs;
• the legal question is not whether the property was unattractive, inconvenient or in need of works, but whether it was genuinely unsuitable for use as a dwelling at that time;
• documents should be selected for quality and relevance, not volume.

That approach is consistent with how HMRC and the tribunals assess these cases. The issue is always the statutory test applied to the facts as they stood on the effective date, usually completion.

The Law

SDLT is charged under the Finance Act 2003. Whether residential rates apply depends, among other things, on whether the subject matter of the transaction consists of a dwelling.

The main provisions commonly considered in these cases are:

• Finance Act 2003, section 43
• Finance Act 2003, section 55
• Finance Act 2003, Schedule 4ZA, where higher rates are in issue
• Finance Act 2003, Schedule 6B, where mixed-property treatment is in issue

For SDLT purposes, the question is generally whether the property was “suitable for use as a dwelling” at the effective date of the transaction. Case law has shown that this is an objective test. The tribunal and courts look at the physical state of the property at the relevant time.

Properties do not fall outside residential treatment merely because they are old, damaged, poorly maintained or require substantial expenditure. Serious defects may still leave a building suitable for use as a dwelling. The condition must be such that the building crosses the line from defective residential property into property that is not suitable for use as a dwelling.

That threshold is now understood to be relatively high following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799.

Analysis

When considering whether supporting evidence helps, the analysis usually works in the following order.

First, identify the exact legal issue. There are two common possibilities:

• whether the property was not suitable for use as a dwelling, so that residential SDLT treatment may not apply in the usual way; or
• whether the property formed part of a mixed-use transaction, which is a different argument and requires separate analysis.

Second, focus on the effective date of the transaction. Evidence is most persuasive if it shows the property’s condition on or very close to completion. A later report may still help, but only if it clearly shows the earlier condition and is supported by other material.

Third, test the condition evidence against the legal threshold. Useful questions include:

• Was there functioning water, electricity and sanitation?
• Was there a kitchen or bathroom capable of ordinary residential use?
• Were there structural defects making occupation unsafe?
• Was the property affected by contamination, flooding, fire damage or severe instability?
• Did any defect prevent normal occupation as a dwelling, rather than simply making the property undesirable?

Fourth, weigh the evidence by quality. The following are commonly the most persuasive:

• RICS survey or valuation prepared for the purchase
• mortgage valuation noting serious defects or lender retention
• specialist reports on structure, subsidence, damp, contamination, drainage or electrics
• dated photographs and videos from the purchase period
• completion statements or correspondence showing emergency works were required immediately
• invoices and contractor reports tied closely to the completion date
• local authority notices, if any, relating to safety or occupation

Fifth, distinguish serious disrepair from legal unsuitability. A property may lack modern decoration, have an outdated kitchen, suffer from damp, need rewiring, or require a full refurbishment, yet still remain suitable for use as a dwelling. The courts have repeatedly resisted attempts to treat ordinary or even major renovation cases as outside residential treatment.

Sixth, consider the impact of Mudan. In light of Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, the condition threshold is relatively high. Readers should therefore be cautious about assuming that severe disrepair automatically means the property was not suitable for use as a dwelling. The question is not whether works were extensive or expensive, but whether the building had, in substance, ceased to be suitable for residential use at the relevant date.

Finally, remember that identification documents and administrative material do not help prove the substantive SDLT point. They may be needed for compliance or file handling, but they do not establish the property’s condition. The real value lies in the condition evidence itself.

Outcome

Supporting evidence can help, but only if it directly and credibly shows that the property was not suitable for use as a dwelling at the effective date of the purchase. The strongest evidence is contemporaneous, independent and technical.

If the evidence shows only that the property needed renovation, modernisation or repair, an SDLT claim is unlikely to succeed. After Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, the bar for proving unsuitability is relatively high.

Practical Steps

If you are assessing your position, the sensible next steps are:

1. Gather all documents created around the purchase date, especially surveys, valuations, reports and photographs.
2. Create a short timeline showing exchange, completion, inspections, utility status and any urgent works.
3. Separate evidence of inconvenience or poor condition from evidence of genuine inability to occupy as a dwelling.
4. Check whether any lender, surveyor or contractor described the property as unsafe or incapable of normal residential occupation.
5. Review whether your argument is really about uninhabitability or whether mixed-use treatment may be the actual issue.
6. Measure the facts against the stricter approach now reflected in Mudan.
7. Before making or amending a return or refund claim, ensure the evidence supports the legal test rather than just the cost of refurbishment.

Conclusion

Evidence is essential in any SDLT condition-based argument, but it must prove more than disrepair. The question is whether the property was objectively unsuitable for use as a dwelling at completion. That is a demanding test, and following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, the threshold is relatively high.

Legal References Used

• Finance Act 2003, section 43
• Finance Act 2003, section 55
• Finance Act 2003, Schedule 4ZA
• Finance Act 2003, Schedule 6B
• 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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