Is a flat with short-let permission still residential for SDLT?

Introduction

Buyers and advisers often ask whether a flat can qualify for non-residential or mixed-use Stamp Duty Land Tax (SDLT) rates where the lease permits short-term lettings and the building includes facilities such as a gym, co-working space or spa-style amenities.

The short answer is that permission to use a dwelling for short lets does not usually change its SDLT classification. For SDLT, the key question is whether the property is residential property as defined by the legislation, not whether the owner may use it for holiday-style or Airbnb-type occupation. In most cases, a flat held on a normal residential lease remains residential, even if short lets are allowed.

The Question

A buyer is considering a new-build flat. The planning position is residential use within Class C3. The lease or landlord’s consent also allows short-term lettings. The building includes residents-only amenities such as a gym, co-working space, saunas and plunge pools.

The issue is whether those features could move the purchase into non-residential or mixed-use SDLT treatment, or whether the flat would still be treated as residential property.

Nick’s Explanation

Nick’s view was that, on those facts, the flat is very unlikely to be treated as anything other than residential for SDLT purposes.

In substance, his reasoning was:

• SDLT looks primarily at the legal nature of the property interest being acquired.
• Permission for short lets does not by itself alter that legal character.
• Airbnb-style or other short-term occupation of a flat is still occupation of residential property unless the legal rights acquired include something more fundamentally non-residential.
• Residents-only amenities such as a gym, co-working area, saunas and plunge pools are usually part of the residential enjoyment of the development, not a separate commercial element.
• For mixed-use treatment, there would usually need to be a genuine non-residential element attached to the ownership, such as rights or obligations connected with publicly accessible commercial premises.

He also noted that the lease and service charge provisions would need to be checked carefully, because in unusual cases those documents may reveal rights over, or financial connections with, non-residential parts of a building or estate.

The Law

The starting point is the SDLT legislation in the Finance Act 2003.

Residential property is broadly defined in section 116 Finance Act 2003. It includes:

• 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, and
• land that forms part of the garden or grounds of such a building.

Non-residential property is property that is not residential property. A transaction may also be mixed-use if it includes both residential and non-residential land.

In practice, SDLT classification depends on the subject matter of the transaction at the effective date. The analysis focuses on what legal interest is being acquired and the physical and legal character of that property.

Planning status can be relevant evidence, but it is not conclusive on its own. Likewise, the way an owner intends to use the property after completion is not normally decisive if the property acquired is, in law and in substance, a dwelling.

Where taxpayers argue that a property was not suitable for use as a dwelling at the effective date, the courts have taken a relatively strict approach. 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

The analysis usually proceeds in the following steps.

First, identify what is being bought. If the purchaser is acquiring a long lease of a flat designed and approved for normal residential occupation, that strongly points to residential treatment.

Second, consider whether the flat is used or suitable for use as a dwelling. A new-build flat with ordinary living accommodation will almost always satisfy that test. The fact that it may be occupied by different short-term guests rather than one long-term occupier does not stop it being a dwelling.

Third, ask whether there is any genuine non-residential element included in the transaction. This is where some mixed-use arguments fail. Facilities restricted to residents are usually treated as ancillary to residential occupation. A private gym, residents’ lounge, co-working area, spa facilities or similar amenities are still part of the residential package if they exist for occupiers’ use and enjoyment.

Fourth, review the lease and estate documents carefully. A different conclusion might be possible only if the purchaser acquires rights or obligations connected with truly commercial premises or activities. Examples might include:

• a share in, or financial exposure to, retail or hospitality premises open to the public;
• service charge contributions towards maintaining public commercial space in a way that forms part of the property rights acquired;
• rights over areas that are not merely ancillary to residential occupation but are genuinely non-residential in character.

Fifth, separate SDLT classification from other tax or regulatory regimes. Short-term letting may matter for planning enforcement, lease compliance, income tax, council tax or business rates in some circumstances. But those are different questions. For SDLT, the issue is whether the subject matter of the purchase is residential property, non-residential property, or a mixture of both.

On the facts described, the short-let permission does not itself create a non-residential interest. Nor do residents-only amenities usually turn a residential flat into mixed-use property. The overall picture remains that of a dwelling within a residential development.

Outcome

In a case like this, the practical conclusion is that the flat will usually be treated as residential property for SDLT purposes.

That means the buyer should not assume that non-residential or mixed-use SDLT rates are available merely because:

• the lease allows short-term lettings, or
• the building has residents-only lifestyle facilities.

A mixed-use argument would normally require something more substantial and legally embedded in the ownership structure.

Practical Steps

Anyone assessing this issue should take these steps:

1. Obtain and review the lease in full, including rights granted, rights reserved and user clauses.
2. Check the service charge provisions to see whether the flat owner contributes to any publicly accessible commercial areas or receives any benefit linked to them.
3. Review the estate plan and any management documents to identify whether there are shops, restaurants, leisure venues or other commercial units and whether the flat owner has any legal connection to them.
4. Confirm the planning position, but do not treat planning use alone as determinative for SDLT.
5. Keep the SDLT question separate from any business rates, council tax or planning questions arising from short-term letting.
6. If a mixed-use claim is being considered, ensure the argument is supported by the transaction documents rather than by intended use alone.

Conclusion

A flat does not usually become non-residential for SDLT just because short lets are permitted. If the property acquired is a dwelling and the extra amenities are for residents only, the transaction will generally remain residential. The lease and service charge documents should still be checked, but on ordinary facts the SDLT treatment is unlikely to move out of the residential regime.

Legal References Used

• Finance Act 2003, section 116
• 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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