Is a separate garage bought with a house a linked transaction for SDLT, and can it make the purchase mixed-use?

Introduction

Buyers often ask whether purchasing a house together with a separate garage changes the Stamp Duty Land Tax (SDLT) position. The issue usually arises where the garage is on a separate legal title, is not attached to the house, and is intended to be used or let separately. The key questions are whether the two purchases are linked transactions and whether the garage is non-residential, which could mean non-residential SDLT rates apply to the combined price.

The Question

A company is buying two interests from the same seller as part of the same overall deal:

• a freehold house that is residential property; and
• a separate garage held under its own leasehold title, not attached to the house and not within the grounds of the dwelling.

The buyer intends to let the garage separately from the house. The practical questions are:

• are the two acquisitions linked transactions for SDLT purposes; and
• does the separate garage count as non-residential property so that the overall purchase is treated as mixed-use?

Nick’s Explanation

Nick’s core view was that, on these facts, the transactions are very likely to be linked because they are being bought by the same purchaser from the same seller as part of the same arrangement.

He also explained that if the garage is genuinely separate from the dwelling and its grounds, and is not itself residential property, there is a real argument that the overall acquisition is mixed-use. In that case, the non-residential SDLT rates would apply to the total consideration for the linked purchase.

In anonymised form, his reasoning can be summarised like this:

Where a buyer acquires a house and a separate garage from the same seller as part of one overall deal, HMRC is likely to treat the acquisitions as linked transactions. If the garage is on a separate title, is not attached to or within the grounds of the house, and is not residential property, there is an arguable basis for mixed-use treatment, with non-residential SDLT rates applying to the total price.

That said, the classification always depends on the precise facts. SDLT treatment is driven by the legal and physical character of the land at the effective date of the transaction, not simply by what the buyer plans to do with it afterwards.

The Law

The main SDLT provisions are in the Finance Act 2003.

• Section 108 defines linked transactions. Transactions are linked if they form part of a single scheme, arrangement or series of transactions between the same vendor and purchaser, or persons connected with them.

• Section 116 defines residential property. 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 certain interests or rights over land that subsist for the benefit of a dwelling.

• Property that does not fall within the statutory definition of residential property is treated as non-residential.

• Where a transaction includes both residential and non-residential property, it is generally treated as mixed-use, and the non-residential rates in section 55 apply.

For linked transactions, SDLT is not worked out by looking at each acquisition in isolation. Instead, the rates are determined by reference to the total consideration for the linked transactions.

Analysis

The analysis usually has four steps.

First, are the transactions linked?

If the house and the garage are being bought from the same seller under the same overall bargain, the answer is usually yes. Separate contracts or separate titles do not by themselves prevent linking. The question is whether there is one arrangement or series of transactions. On the facts described, that threshold is likely to be met.

Second, is the garage residential property?

This is the key point. A garage can in some cases be treated as residential if it forms part of the garden or grounds of a dwelling or is held for the benefit of the dwelling. But where the garage is physically separate, on its own title, and not attached to or within the grounds of the house, there is a stronger argument that it is not residential property.

Third, does the buyer’s intended separate letting matter?

The intended separate rental use may support the factual picture that the garage is a distinct asset. However, intention alone does not decide the SDLT classification. The more important questions are the garage’s physical relationship to the house, its legal title, and whether it forms part of the dwelling’s grounds or benefits the dwelling in a way that brings it within section 116.

Fourth, if the garage is non-residential, what is the SDLT result?

If the garage is non-residential and the transactions are linked, the combined acquisition is generally treated as mixed-use. That means the non-residential SDLT rates apply to the total consideration for the linked transactions rather than the residential rates.

In practice, the strongest factors pointing towards mixed-use treatment here are:

• the garage is on a separate title;
• it is not attached to the house;
• it is not on the grounds of the house; and
• it is intended to be exploited separately rather than enjoyed with the dwelling.

Points that may still attract HMRC scrutiny include:

• whether the garage is close enough to the house to be regarded as part of its grounds or ancillary to its residential use;
• whether the seller used it as part of the dwelling before sale;
• whether rights benefiting the house connect the two properties; and
• how the contract documents describe the garage and the overall transaction.

It is also worth noting that where buyers argue a dwelling was not suitable for use as a residence, the threshold is now relatively high following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799. That case makes clear that “unsuitable for use” arguments are not easily made out. However, that issue is different from the present one. Here, the more relevant question is whether the separate garage is residential property at all.

Outcome

On the facts given, the likely SDLT analysis is:

• the house purchase and the garage purchase are likely to be linked transactions under section 108 Finance Act 2003; and
• if the garage is genuinely separate and does not form part of the house’s garden, grounds or residential enjoyment, there is a credible argument that it is non-residential property.

If that argument is correct, the linked acquisition should be treated as mixed-use, with non-residential SDLT rates applying to the total price paid for both assets.

Practical Steps

Anyone assessing a similar purchase should check the following carefully before filing the SDLT return:

• Review the title documents for both properties to confirm they are legally separate.

• Check plans and location details to establish whether the garage is outside the garden or grounds of the house.

• Consider historic use: was the garage used with the dwelling, or was it functionally separate?

• Examine the contract structure to see whether the acquisitions form one overall arrangement.

• Ensure the SDLT return reflects the correct treatment of linked transactions and, if applicable, mixed-use rates.

• Keep evidence showing why the garage should be treated as non-residential, in case HMRC later asks questions.

Conclusion

A separate garage bought with a house will often be linked to the house purchase for SDLT if both are acquired from the same seller as part of the same deal. If the garage is truly separate from the dwelling and its grounds, it may be non-residential property, which can make the overall acquisition mixed-use and bring the non-residential SDLT rates into play.

Legal References Used

• Finance Act 2003, section 55
• Finance Act 2003, section 108
• 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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