SDLT on Two-Flat Mixed-Use Property with Garages
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How much SDLT is payable when a company buys a property with two flats and development land?
Introduction
People often ask how Stamp Duty Land Tax (SDLT) works where a company is buying a mixed residential site, especially where the title appears to include more than one dwelling and some additional land with development potential. The SDLT result can change depending on exactly what is included in the purchase and whether the land forms part of the grounds of the dwellings.
In this type of case, the key question is usually whether the transaction counts as the purchase of multiple dwellings, and whether any extra land changes the analysis. The site boundary matters.
The Question
A buyer is purchasing, through a limited company, a property for £314,000. The site appears to include two flats and there is also land to the rear with planning approval for garages or further building works. The buyer wants to know how much SDLT is likely to be payable.
Nick’s Explanation
Nick’s main point was that the answer depends first on the exact extent of the land being acquired. In anonymised form, his response was essentially: can you confirm the property boundary, because there appears to be a small rear garden and then some additional land beyond it, and the SDLT analysis may depend on whether that land is included in the sale.
That is an important starting point. SDLT is charged on the land transaction actually being completed. If the purchase includes two self-contained flats, that may point toward multiple dwellings relief principles being relevant, subject to the law in force at the effective date of the transaction. If the purchase also includes separate land, the next issue is whether that land is part of the residential property or whether it could affect the transaction’s character.
The Law
SDLT is charged under the Finance Act 2003.
For company purchases of residential property, the higher rates for additional dwellings generally apply. A company does not benefit from the ordinary main residence rules that can assist some individual buyers.
Whether property is “residential property” is determined under Finance Act 2003, section 116. Broadly, this includes:
- a building used or suitable for use as a dwelling,
- land that is or forms part of the garden or grounds of a dwelling, and
- interests or rights over land that subsist for the benefit of a dwelling.
Where more than one dwelling is acquired in a single transaction, the multiple dwellings rules may need to be considered. The detailed SDLT treatment depends on the legislation in force at the time of completion and any transitional provisions that apply.
If an argument is being considered that a building is not suitable for use as a dwelling because it is derelict or uninhabitable, the threshold is now relatively high following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799. A property will not fall outside residential treatment merely because it is in poor condition or requires significant works. The courts now take a stricter view of when a dwelling is truly not suitable for use.
Analysis
The SDLT analysis here should be approached in stages.
Identify exactly what is being bought.
The contract, title plan, transfer plan and any separate title numbers must be checked. If the purchase includes only the building containing two flats and its ordinary grounds, that is one scenario. If it also includes extra land beyond the normal garden area, that may require separate analysis.
Decide whether there are two dwellings.
If the building genuinely contains two self-contained flats, that usually means two dwellings are being acquired. The practical question is whether each flat has the characteristics of a dwelling in SDLT terms, such as separate living accommodation.
Consider whether the rear land is part of the garden or grounds.
If the rear land forms part of the garden or grounds of the flats, it is generally still residential property under section 116. Planning permission for garages or future building does not automatically stop land from being garden or grounds. The factual use, layout and relationship to the dwellings matter.
Consider whether the transaction is wholly residential or has any non-residential element.
If all the land acquired is residential property, the residential SDLT rules apply. If a genuinely separate non-residential element is included, that can alter the SDLT treatment. However, this is a technical question and cannot be answered safely without seeing the title and plan.
Apply the company rates.
Because the buyer is a company, the higher residential rates usually need to be considered. If the purchase is of two dwellings, the multiple dwellings rules may also need to be reviewed, depending on the law applicable at the completion date.
On the limited facts given, the most likely starting point is that this is a company purchase of residential property consisting of two flats, with the rear land potentially forming part of the grounds. That points toward residential SDLT treatment rather than any automatic non-residential treatment simply because there is planning permission at the back.
Outcome
The practical conclusion is that the SDLT cannot be confirmed accurately from the purchase price alone. The boundary of the property and the legal status of the rear land are critical. If the company is buying two self-contained flats and the rear area forms part of their grounds, the transaction is likely to be treated as residential, with company rates applying. The existence of planning permission for garages or future works does not by itself change that result.
Practical Steps
- Obtain the title register and title plan for every title included in the purchase.
- Check whether the rear land is included in the transfer and whether it is on the same or a separate title.
- Confirm whether each flat is genuinely self-contained.
- Review the contract pack and any planning documents to understand the current use of the rear land.
- Ask the conveyancer to identify whether the transaction is being treated as wholly residential or as including any non-residential element.
- Before completion, have the SDLT calculation checked against the exact property composition and the rules in force on the effective date of the transaction.
Conclusion
Where a company buys a site containing two flats and adjoining land, SDLT depends on what is actually included in the purchase and whether that land forms part of the grounds of the dwellings. The boundary question comes first. In most cases of this kind, planning potential at the rear does not by itself change residential SDLT treatment.
Legal References Used
- Finance Act 2003
- 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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