September 2, 2026
SDLT
The First-tier Tribunal has allowed a purchaser’s SDLT appeal after finding that a severely deteriorated former home had ceased to be residential property. The decision is an important illustration of the high—but not impossible—threshold left by the Court of Appeal in Mudan.
Oakwood Great Oak Ltd acquired ‘Great Oak’, a substantial detached house in Bushey Heath, on 29 November 2022 for £2.4 million. It filed the transaction as non-residential. HMRC opened an enquiry and issued a closure notice on the basis that the property remained residential property within section 116(1)(a) of the Finance Act 2003. That conclusion was upheld on review, and the company appealed.
The house had been constructed in the 1930s and used as a dwelling for many years. It was still standing and retained a recognisable residential form and layout. Those facts mattered: previous residential use and continued residential form both pointed towards HMRC’s position. But the building had also been vacant for approximately three to four years and had deteriorated materially.
The evidence included structural reports, a costing report, photographs and an asbestos survey. The Tribunal found significant damp, mould, water ingress and deterioration; substantial structural and fabric defects; defects affecting the retaining wall, terrace and extension; and asbestos-containing materials in numerous locations. Unrestricted occupation was unsafe. Licensed asbestos remediation, structural intervention and consequential reinstatement of services and building elements would have been required before the property could again function as a dwelling.
Section 116(1)(a) defines residential property to include 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. Schedule 4ZA uses materially similar language when identifying a single dwelling for the higher rates.
The parties agreed that the governing approach was that stated by the Upper Tribunal and endorsed by the Court of Appeal in Mudan v HMRC. The question is not whether a buyer could move in immediately. It is an objective, multifactorial evaluation of whether the building retained the fundamental characteristics and identity of a dwelling at the effective date. Previous use is highly relevant; so are structural soundness, the necessary works considered collectively, remediability, safety and the practical consequences of the works. No single factor is decisive.
That distinction is central. A property does not become non-residential merely because it is uninhabitable, dangerous in some respects, unmodernised, without working services or in need of extensive repair. The statutory boundary is crossed only when the condition and works required, viewed together, mean that the building has lost the identity of a dwelling.
The Tribunal accepted that repair and asbestos removal were physically possible. The house was not at risk of imminent collapse. Those findings favoured HMRC, but they did not end the enquiry. The Tribunal rejected an approach under which the theoretical possibility of repair is decisive regardless of scale, consequences, time and resources. Almost any standing structure could be described as repairable on that basis, which would deprive the statutory assessment of meaningful content.
The asbestos evidence was particularly important. Contamination was widespread, affected services and infrastructure and required licensed work, controlled zones, monitoring, cleaning and certification. Removal would have disturbed or removed associated building elements and installations. It would therefore have left the property in a materially stripped-out condition, requiring substantial reinstatement before residential functionality could return.
The company relied on a report estimating remedial costs of approximately £2.25 million. The Tribunal did not accept that figure with sufficient precision to make a finding about exact cost, and it did not treat economic viability as a separate legal test. It did, however, regard projected cost as evidence of the exceptional magnitude and intrusiveness of the intervention required. That is a careful but practically important distinction.
The purchaser’s intention to demolish and redevelop was given limited weight. The statutory question concerned the property’s objective condition at completion, not the developer’s commercial plan or subsequent planning permission. The taxpayer won because of the cumulative evidential picture—not because demolition was intended or more profitable.
Standing back, the Tribunal concluded that this was not simply an unmodernised dwelling awaiting substantial refurbishment. Prolonged vacancy, extensive deterioration, asbestos contamination, structural defects, safety concerns and the exceptional scale and consequences of remediation had fundamentally altered the building’s character. Although externally recognisable as a former home, it had crossed the line contemplated in Mudan and was no longer suitable for use as a dwelling.
Oakwood is a First-tier Tribunal decision and therefore does not bind other tribunals or courts. It applies the binding Court of Appeal approach in Mudan to unusually strong facts. HMRC’s manual continues to state that only a very limited number of properties will be unsuitable for use as a dwelling and lists asbestos and repairable structural defects among matters that ordinarily do not change residential character. Oakwood does not contradict the proposition that those matters are usually insufficient. It shows that their scale, distribution, interaction and consequences may become decisive when assessed cumulatively.
It would therefore be unsafe to market Oakwood as a general ‘uninhabitable property’ route to non-residential rates or refunds. The Tribunal expressly rejected single-factor reasoning. A missing kitchen, defective wiring, damp, asbestos or substantial repair costs cannot simply be converted into a checklist that produces a non-residential answer.
The reasoning may also be useful by analogy under Welsh LTT and Scottish LBTT because section 72 of the Land Transaction Tax and Anti-avoidance of Devolved Taxes (Wales) Act 2017 and section 59 of the Land and Buildings Transaction Tax (Scotland) Act 2013 use closely comparable ‘used or suitable for use as a dwelling’ language. The statutory schemes are distinct and decisions must be applied with care. Oakwood is not binding in Wales or Scotland; its value there is persuasive, principally as an evidence-led application of materially similar wording.
Oakwood supplies a useful counterpoint to the frequent overstatement of Mudan. The bar remains high, but a former dwelling need not have collapsed or become literally impossible to repair before it can lose residential character. The decisive exercise is evaluative and cumulative: what did the building objectively amount to at completion, and what would have to happen before it could again perform the ordinary function of a dwelling?
For professional advisers, the practical lesson is evidential discipline. Strong claims will be built from contemporaneous, specialist and joined-up evidence showing not simply that occupation was impossible, but that the nature, extent and consequences of remediation had changed the building’s identity.
This article is for general information only and does not constitute legal or tax advice. SDLT treatment depends on the facts and evidence at the effective date.
