Of all the stamp duty refund claims circulating in the UK property market, the uninhabitable property claim is by far the most controversial — and the most risky. The idea is simple: if a property is so dilapidated that it can no longer function as a dwelling, it should be taxed at non-residential SDLT rates, which are significantly lower.
The potential saving is eye-watering. But the bar is extremely high, HMRC is actively challenging these claims, and the consequences of getting it wrong are severe. This guide explains what actually qualifies, what doesn't, and why you should approach this area with extreme caution.
The potential saving
Non-residential SDLT rates are substantially lower than residential rates, especially at higher property values. Here's a comparison:
| Purchase price | Residential SDLT | Non-residential SDLT | Saving |
|---|---|---|---|
| £400,000 | £10,000 | £9,500 | £500 |
| £600,000 | £20,000 | £19,500 | £500 |
| £800,000 | £30,000 | £29,500 | £500 |
| £1,000,000 | £43,750 | £39,500 | £4,250 |
Calculated at current standard residential and non-residential SDLT rates as at 22 May 2026. See the gov.uk SDLT rates page. The residential and non-residential schedules diverge mainly above £925,000; at lower values the headline saving is small — the larger saving for additional-property buyers comes from avoiding the 5% surcharge, shown below.
For additional property buyers paying the 5% surcharge — the Higher Rates for Additional Dwellings under Schedule 4ZA, Finance Act 2003, raised from 3% to 5% at the Autumn Budget 2024 — the savings are even more dramatic because the surcharge does not apply to non-residential transactions:
With the 5% additional property surcharge
£800,000 residential (with surcharge): £70,000
£800,000 non-residential: £29,500
Potential saving: £40,500
It's this headline saving that drives the aggressive marketing from claims firms. But the reality of qualifying is very different from what the adverts suggest.
What HMRC says
In July 2025, HMRC publicly warned homebuyers about repayment agents that argue a property is non-residential simply because it needed repair or modernisation — and confirmed it is actively challenging these claims through compliance checks.
HMRC's announcement gives a worked example. A buyer paid £1,100,000 for a London house and £53,750 in SDLT. A repayment agent argued the property was non-residential because it needed a new boiler, rewiring and damp proofing, and obtained a £9,250 refund — keeping 30% as its fee. HMRC's compliance check confirmed the property was residential, leaving the buyer to repay the £9,250 with interest and a penalty, while the agent stopped responding.
HMRC's position is that the vast majority of repair-based "uninhabitable" claims do not meet the legal threshold, and it is dedicating significant compliance resources to investigating and challenging them. If your claim is rejected after a compliance check, you face not just repayment of the refund, but interest and potentially penalties.
The legal test
The question of whether a property qualifies as a "dwelling" for SDLT purposes is governed by Section 116 of the Finance Act 2003 (see HMRC's guidance at SDLTM00410), as interpreted by the Court of Appeal in Mudan v HMRC [2025] EWCA Civ 799. A dwelling is defined as:
“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.”
The courts have developed a two-stage test, applied by the Court of Appeal in Mudan v HMRC [2025] EWCA Civ 799 and in earlier decisions including Fish Homes Ltd v HMRC [2020] UKFTT 180 (TC) (see our Fish Homes explainer), David Hyman & Anor v HMRC [2022] EWCA Civ 185 (see our Hyman & Goodfellow explainer), and P N Bewley Ltd v HMRC [2019] UKFTT 65 (TC):
If yes, there is a strong presumption that it remains a dwelling. The burden of proof shifts to the taxpayer to demonstrate that it has lost its essential character as a dwelling.
This is the critical question. The property must have deteriorated to such an extent that it can no longer reasonably be described as a dwelling — not just a dwelling in poor condition, but something that has fundamentally ceased to be a dwelling at all.
What actually qualifies (the very high bar)
Based on case law and HMRC guidance — see SDLTM00410 and the taxpayer-favourable decision in P N Bewley Ltd v HMRC [2019] UKFTT 65 (TC) (see our Bewley case note) — a property may genuinely qualify as non-residential if:
- Structural defects make it dangerous to occupy — collapsing walls, ceilings, roof structures, or floors that have failed. Not just cracked plaster or damp patches, but actual structural failure.
- Complete absence of basic services where restoration would require rebuilding rather than repair — no plumbing, no electrical supply, no drainage. A property that needs rewiring or replumbing still has the infrastructure for these services.
- The property has been stripped back to a shell — no internal walls, no floors, no staircase. A building that is essentially a structure with a roof but nothing inside that resembles a dwelling.
- Fire or flood damage so severe that the building requires demolition and reconstruction rather than repair.
What does NOT qualify
This is where most claims fall apart. The following conditions do not make a property "uninhabitable" for SDLT purposes:
- Properties needing rewiring, replumbing, or new heating — these are repair and improvement works, not indicators that the property has ceased to be a dwelling
- Damp, mould, and condensation — even severe damp does not mean the property is uninhabitable. Many occupied properties in the UK have damp issues.
- Pest or vermin damage — rat or mouse infestations, woodworm, or other pest damage is treatable and does not change the fundamental character of the building
- Properties that are "dirty" or "run down" — neglect, accumulated rubbish, overgrown gardens, peeling wallpaper, broken windows — none of these meet the threshold
- Properties without a kitchen or bathroom — if the building still has the structure and services to support a kitchen and bathroom (pipes, drainage, electrical supply), it's still a dwelling even if the fixtures have been removed
- Properties that need "significant renovation" — the amount of work required is not the test. A property that needs £200,000 of renovation can still be a dwelling.
Key case: Mudan v HMRC [2025] EWCA Civ 799
In this landmark Court of Appeal case, the court confirmed that needing significant repair work does not make a property uninhabitable for SDLT purposes. The property in question was in poor condition with numerous defects, but the court held it retained its fundamental characteristics as a dwelling. This case has made it significantly harder to succeed with uninhabitable property claims. See our Mudan case-law summary for what it means for refund claims.
The risks of claiming incorrectly
If you make an uninhabitable property claim and HMRC disagrees — which is common, given how few repair-based claims meet the legal threshold — here's what happens:
HMRC will write to you requesting evidence to support your claim. You'll need to provide a surveyor's report, photographs, and a detailed argument for why the property qualifies.
If your claim is rejected, you must repay the full refund amount plus interest calculated from the date the refund was paid. HMRC's late-payment interest rate is 7.75% per annum (as at 9 January 2026). On a £30,000 refund held for 2 years, that's about £4,650 in interest alone.
Under Schedule 24 of the Finance Act 2007, if HMRC considers the claim to be careless, penalties of up to 30% can apply. For deliberate claims — which HMRC may argue if the property was clearly habitable — penalties can reach 100%. On a £30,000 underpayment, that's potentially another £30,000 in penalties.
If a claims firm encouraged you to make the claim and took a percentage fee when the refund was paid, that fee is typically non-refundable. If HMRC later claws back the refund, you lose both the refund and the fee. Some claimants have ended up worse off than if they had never claimed.
How the threshold has narrowed
Following HMRC's July 2025 warning on bogus stamp duty claims and the Court of Appeal's restrictive ruling in Mudan v HMRC [2025] EWCA Civ 799, the threshold for successful uninhabitable claims has narrowed significantly. Claims that previously succeeded at FTT level — such as P N Bewley Ltd v HMRC [2019] UKFTT 65 (TC) — are harder to win post-Mudan. HMRC has emphasised that unsuccessful or aggressive claims carry penalty exposure under Schedule 24 of the Finance Act 2007.
Our honest view
The uninhabitable property relief is a legitimate part of the SDLT legislation. There areproperties that genuinely qualify — derelict shells that have completely lost their character as dwellings. If you've purchased such a property, you should absolutely claim non-residential rates.
But if your property was merely in need of renovation — even significant, expensive renovation — it almost certainly does not meet the threshold. The case law has set a very high bar, HMRC is actively challenging claims, and the financial consequences of getting it wrong are severe.
If you're considering this type of claim, get independent professional advice from a RICS surveyor and a specialist tax adviser — not from a claims firm that earns its fee when the claim is submitted, regardless of whether it's ultimately successful.
Uninhabitable is one of the routes screened by our 6-question refund check — if you're unsure whether your property clears the bar, it's a quick way to gauge where you stand before taking advice.
For a safer, lower-risk way to reduce your SDLT liability, consider the chattels deduction — a straightforward, HMRC-approved relief that applies to almost every property purchase.
Check your chattels refund instead
Lower risk, HMRC-compliant, and available on virtually any property. Check your refund in 2 minutes.