Can a damp and rot report make a property non-residential for SDLT?

Introduction

Buyers often ask whether serious damp, rot or similar defects mean a dwelling was not suitable for use as a residence on the purchase date, so that residential Stamp Duty Land Tax rules might not apply. This question matters because SDLT treatment can change significantly depending on whether the property was a dwelling at the effective date of the transaction.

Where there is a specialist report showing timber decay, damp or remedial works, the key issue is not simply whether the property needed repair. The real question is whether the condition of the building was so poor that it was not suitable for use as a dwelling at the relevant date. The courts have made clear that this is now a relatively high threshold, especially following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799.

The Question

A buyer obtained a specialist report on a property before or around purchase. The report identified issues such as damp, rot and recommended remedial works. The buyer wants to know whether that report could support the argument that the property was uninhabitable, or not suitable for use as a dwelling, for SDLT purposes.

Nick’s Explanation

Nick’s reasoning can be summarised in this way: a report showing damp, rot, decay or needed repairs does not by itself prove that a property was unsuitable for use as a dwelling. The legal test is stricter than a simple survey finding that the building was in poor condition or required substantial work.

In anonymised terms, the point is that many properties are bought with defects, including serious defects, but still remain dwellings for SDLT. The question is whether the building had crossed the line from being defective into being genuinely unsuitable for residential use at the effective date.

Nick’s explanation is consistent with the current case law approach: evidence such as specialist reports, contractor quotations, photographs and survey comments can all be relevant, but they must show more than disrepair. They need to show that the property could not realistically be used as a home at the relevant time.

The Law

The starting point is the Finance Act 2003. SDLT applies differently depending on whether the subject matter is residential property. A building counts 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 legislation is found principally in:

• Finance Act 2003, section 116
• Finance Act 2003, Schedule 4ZA, where relevant to higher rates

The phrase “suitable for use as a dwelling” has been considered by the courts and tribunals. The test is an objective one. It is not enough that the buyer intended major renovation, or that the property was unpleasant, outdated or expensive to repair. The condition must be such that, viewed realistically, the building was not suitable for use as a home on the effective date of the transaction.

The modern authorities show that the threshold is demanding. In an uninhabitable or not suitable for use case, the condition thresholds are now relatively high following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799.

Analysis

When applying the rules to a damp and rot report, the analysis usually works in stages.

First, identify the condition of the property at the effective date of the transaction. For SDLT, this is usually completion, unless substantial performance happened earlier. The relevant evidence must therefore relate to the property’s actual condition at that date.

Second, ask what the report really shows. A report dealing with woodworm, dry rot, rising damp, penetrating damp, defective plaster, decayed skirting, damaged joists or similar issues may show that the property needed significant remedial work. But that does not automatically mean it was not suitable for use as a dwelling. Many occupied homes have serious defects and still remain dwellings in law.

Third, consider whether the defects affected the essential character of the building as a place to live. Relevant questions include:

• Was there a functioning kitchen and bathroom?
• Was there access to basic services such as water, electricity and drainage?
• Were the rooms capable of normal residential occupation?
• Did the defects create a genuine inability to live there, rather than inconvenience or health concerns that could be addressed by repairs?
• Was any part of the structure unsafe to the extent that occupation was unrealistic?

Fourth, distinguish between substantial repair and true unsuitability. A contractor’s quotation for remedial treatment may prove cost and scope of works, but not necessarily legal unsuitability. For example, a report recommending timber treatment, damp-proofing, replastering or localised structural repair may still describe a building that remains a dwelling. The fact that repairs are urgent, expensive or extensive is relevant, but not decisive.

Fifth, weigh the evidence as a whole. Stronger evidence in favour of unsuitability might include:

• independent survey evidence stating the property could not be occupied as a residence at the relevant date
• photographs showing severe structural collapse, pervasive water ingress, missing facilities or dangerous conditions
• evidence that utilities or sanitation were absent or unusable
• local authority prohibition or enforcement material, where it exists
• evidence that occupation would have been impossible, not merely undesirable

By contrast, evidence is weaker where it shows only that the property was run down, damp, infested, in need of treatment, or not mortgageable on ordinary terms. Mortgageability and habitability are not the same legal test as suitability for use as a dwelling under Finance Act 2003.

The significance of Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799 is that it reinforces the high bar in these cases. The courts are unlikely to accept that a property falls outside residential treatment merely because it was in poor condition or required major works. The defects must go further and show that the building was not suitable for use as a dwelling in a real and practical sense.

Outcome

A damp and rot report may help, but on its own it will rarely be enough to establish that a property was non-residential for SDLT purposes. If the report simply identifies damp, rot, timber decay, infestation or recommended treatment works, that usually points to disrepair rather than legal unsuitability.

To succeed on a not suitable for use argument, the evidence would need to show a much more serious level of failure in the property’s condition. Following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, the threshold is relatively high.

Practical Steps

If you are assessing whether a defective property was unsuitable for use as a dwelling at purchase, it is sensible to:

• obtain the full survey and any specialist reports, not just quotations for repair
• gather dated photographs showing the condition at completion
• identify whether basic living facilities were present and usable
• check whether any structural engineer, surveyor or local authority material states the property could not be occupied
• separate evidence of disrepair from evidence of actual unsuitability for residential use
• review the completion date carefully, because the condition on that date is critical
• compare the facts against the current case law, including the stricter approach confirmed by the appellate courts

If the evidence shows only that the property needed major refurbishment, treatment or renovation, the safer view is usually that it remained residential property for SDLT.

Conclusion

A report showing damp, dry rot or timber decay does not automatically take a property outside the residential SDLT rules. The legal question is whether the property was suitable for use as a dwelling on the effective date, and that is a demanding test. After Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, the condition threshold in uninhabitable cases is now relatively high.

Legal References Used

• Finance Act 2003, section 116
• Finance Act 2003, Schedule 4ZA
• 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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