Can a Property With Serious Structural Cracks Be Treated as Non-Residential for SDLT?

Introduction

Buyers sometimes ask whether a run-down or damaged house can avoid residential Stamp Duty Land Tax rates. This usually comes up where the building has major defects, no working facilities, or looks unsafe. The key legal question is not whether the property is attractive, modern, or ready to live in straight away. The question is whether, at the effective date of the transaction, it is still “suitable for use as a dwelling”.

This matters because if a property is residential, residential SDLT rates apply. If it is genuinely non-residential, non-residential rates apply instead. In severe condition cases, the argument usually turns on whether the building has crossed the line from a damaged dwelling into something no longer suitable for residential use.

The Question

A prospective buyer was considering purchasing a house in the £500,000 to £600,000 range. Photographs of the property showed significant cracking and possible structural movement. The buyer wanted to know whether the condition of the building might allow the purchase to be treated as non-residential for SDLT purposes, rather than residential.

Nick’s Explanation

Nick’s core point was that SDLT is self-assessed, so the purchaser must take responsibility for the classification used on the return. He explained that visible cracking can be important evidence, but it is not enough on its own to justify a non-residential filing.

His reasoning can be summarised like this:

• A property does not stop being residential just because it is in poor condition or needs major renovation.
• The threshold for saying a building is not suitable for use as a dwelling is now relatively high following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799.
• The strongest possible argument in a structural case is where there is a genuine and serious risk of collapse, or where the building has otherwise lost its identity as a dwelling.
• If a buyer wants to take that position, independent professional evidence is critical, usually in the form of a structural surveyor’s report.
• Without that evidence, a non-residential SDLT treatment would be difficult to support.

Nick also noted that if a buyer files on a non-residential basis in a case like this, an HMRC enquiry is a real possibility. The strength of the position will depend on the quality of the evidence available at the time of filing.

The Law

The starting point is the Finance Act 2003. SDLT applies to land transactions, and the rate depends on the nature of the subject matter acquired. For dwellings, residential rates apply. For property that is not residential, non-residential rates apply.

The key statutory concept is whether the property consists of or includes “residential property”. Broadly, a building used or suitable for use as a dwelling will usually be treated as residential property. The difficult cases arise where the building is in such poor condition that the buyer argues it is no longer suitable for use as a dwelling at all.

The courts have repeatedly made clear that the test is not whether the property is immediately comfortable, mortgageable, or compliant with modern expectations. A house can still be a dwelling even if it needs extensive works. Missing kitchens, defective bathrooms, outdated wiring, poor decoration, damp, rot, or general disrepair do not automatically make it non-residential.

The leading modern authority is Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799. The Court of Appeal confirmed that the threshold for a dwelling to become unsuitable for use is a demanding one. 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.

That decision indicates that only extreme cases are likely to fall outside the residential category, such as:

• structural defects so severe that there is a genuine risk of collapse;
• conditions showing the building has effectively ceased to function as a dwelling at all; or
• other exceptional circumstances, such as legal or physical barriers that mean it has lost its identity as a dwelling.

Analysis

The correct analysis is usually a step-by-step one.

1. Identify the subject matter at the effective date

   The relevant question is the condition of the property at the effective date of the transaction, usually completion. It is not enough to say that the buyer plans to strip it out, rebuild it, or carry out major works afterwards.

2. Ask whether it is still suitable for use as a dwelling

   This is an objective test. The issue is not whether someone would want to move in immediately. The issue is whether the building remains, in substance, a dwelling.

3. Distinguish disrepair from fundamental unsuitability

   Serious cracks may indicate anything from cosmetic movement to major structural failure. If the cracks reflect ordinary disrepair or a need for repair works, the property is likely still residential. If they show failure of the structure such that there is a genuine risk of collapse, the case becomes stronger.

4. Obtain independent evidence

   Photographs help, but they are not a substitute for expert opinion. In practice, a structural engineer’s or structural surveyor’s report is the most important evidence. The report should address the nature of the defects, their severity, and whether the building is unsafe to occupy because of structural instability.

5. Consider whether the evidence reaches the post-Mudan threshold

   After Mudan, the bar is high. A property requiring extensive renovation can still be residential. A buyer therefore needs evidence of something more extreme than serious disrepair. The report should support a conclusion that the building is not merely dilapidated, but fundamentally unsafe or no longer functioning as a dwelling.

6. Assess filing risk

   If the purchaser files the SDLT return on a non-residential basis, HMRC may enquire into the return. In a condition case, the buyer should expect HMRC to scrutinise the survey evidence, photographs, and the reasoning behind the classification.

Nick’s suggested approach reflects this framework. If a proper survey confirms a genuine and serious risk of collapse, there may be an arguable basis for non-residential treatment. If not, the safer view is likely to be that the property remains residential, even if the works required are extensive and expensive.

Outcome

A house with visible structural cracks is not automatically exempt from SDLT and is not automatically non-residential. In most cases, a damaged house will still be treated as residential property. The position only starts to shift if the defects are so serious that the building is no longer suitable for use as a dwelling under the high threshold confirmed in Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799.

So the practical conclusion is this: if the issue is ordinary disrepair, even substantial disrepair, residential SDLT rates are likely to apply. If there is credible expert evidence of extreme structural failure and genuine danger, a non-residential argument may be available.

Practical Steps

• Arrange a full structural survey or structural engineer’s report before deciding on SDLT treatment.
• Ask the expert to address whether the defects create a genuine risk of collapse or otherwise mean the building is not suitable for use as a dwelling.
• Keep dated photographs, sales particulars, correspondence, and any contractor or survey evidence showing the actual condition at completion.
• Make sure the SDLT analysis is based on the property’s condition at the effective date, not on planned future works.
• If considering a non-residential filing, ensure the legal reasoning and evidence are organised in case HMRC opens an enquiry.
• Do not assume that lack of a kitchen, bathroom, utilities, or modern condition standards is enough on its own.

Conclusion

A property in very poor condition can still be residential for SDLT. The modern case law sets a high bar for saying a dwelling is no longer suitable for use. Serious structural cracking may support a non-residential argument, but only if expert evidence shows the defects are extreme, such as a genuine risk of collapse. In most cases, the answer will turn on the quality of the survey evidence rather than on photographs alone.

Legal References Used

• Finance Act 2003
• Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799
• SDLT1 return classification framework
• Non-residential SDLT rates under Table B

This page was last updated on 22 March 2026.

See all questions and answers categorized in this sitemap. Or use Google site search below.