How is SDLT calculated when buying two houses together to live in one and renovate the other?

Introduction

Buyers sometimes purchase two neighbouring or already-separated dwellings as part of one wider family plan. A common example is buying two run-down houses together, moving into one, renovating the other, and later deciding whether to rent one out or transfer one to adult children.

In that situation, the main SDLT questions are usually:

• whether the purchase is taxed as one transaction or two;
• whether the higher rates for additional dwellings apply;
• whether relief is available because more than one dwelling is being bought; and
• whether a later transfer to children creates a further SDLT charge.

The answer depends mainly on whether the buyers are replacing their only or main residence, whether they own any other dwellings, and whether the two purchases are linked.

The Question

A married couple are buying two dwellings from the same seller for a total of £550,000. One dwelling is priced at £300,000 and the other at £250,000. Both need renovation. The plan is to live in one dwelling first, renovate the other, then move across and possibly renovate the first one later. In future, one of the dwellings might be rented out for a period, and one may eventually be transferred to their children to help them onto the property ladder.

The buyers want to know how SDLT is calculated on the purchase and what the tax position may be later if one dwelling is transferred to their children.

Nick’s Explanation

Nick’s core point was that, if the buyers are selling their previous main residence and do not own any other residential properties, the higher-rate surcharge for additional dwellings does not apply. In that case, SDLT is charged at the ordinary residential rates on the total purchase price.

He also explained that where two dwellings are bought together from the same seller, they are normally treated as linked transactions, so the consideration is aggregated for SDLT purposes.

On those facts, his calculation was:

• 0% on the first £125,000 = £0
• 2% on the next £125,000 = £2,500
• 5% on the remaining £300,000 = £15,000

Total SDLT: £17,500.

Nick also noted that Multiple Dwellings Relief is no longer generally available for completions after 1 June 2024, unless the transitional conditions for earlier exchanges are met.

On a later gift to children, he explained that if a dwelling is transferred with no mortgage and no money or other chargeable consideration is given, there is generally no SDLT because SDLT is charged on chargeable consideration, not on a pure gift.

The Law

SDLT is charged under the Finance Act 2003 on land transactions involving chargeable consideration.

For residential property, the amount of SDLT depends on:

• the effective date of the transaction;
• the total chargeable consideration;
• whether the transaction is residential or non-residential;
• whether higher rates for additional dwellings apply; and
• whether any relief is available.

Where separate purchases form linked transactions, Finance Act 2003 treats them together for rate-setting purposes. That means the total price is aggregated and SDLT is calculated on the combined consideration rather than each purchase being taxed separately at lower bands.

The higher rates for additional dwellings in Schedule 4ZA Finance Act 2003 can apply where, at the end of the day of purchase, the buyer owns more than one dwelling and is not replacing their only or main residence. If the buyers are genuinely replacing their main residence and meet the statutory conditions, the surcharge does not apply.

Multiple Dwellings Relief, previously found in Schedule 6B Finance Act 2003, was abolished for most transactions completing on or after 1 June 2024. As a result, many purchases of two or more dwellings no longer benefit from that relief.

As for later transfers, SDLT is only charged if there is chargeable consideration. A gift of a dwelling can still trigger SDLT if the recipient takes the property subject to debt, such as an assumed mortgage. But where there is no money, no debt assumed, and no other consideration, there is generally no SDLT charge.

Where buyers argue that a property was not suitable for use as a dwelling at the effective date, the threshold is now relatively high following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799. A property being run down, dated, or in need of renovation will often still count as a dwelling if it remains suitable for residential use.

Analysis

Step one is to identify whether the two purchases are linked. Here, the dwellings are being bought together from the same seller as part of one overall bargain for £550,000. That strongly indicates linked transactions, so the prices are aggregated.

Step two is to decide whether ordinary residential rates or the higher additional dwelling rates apply. If the couple are disposing of their former only or main residence and do not retain other residential property interests that bring them within Schedule 4ZA, the surcharge should not apply. If, however, they still own another dwelling at the end of the day of completion and are not replacing a main residence within the statutory rules, the higher rates may apply instead.

Step three is to calculate the SDLT on the aggregated figure. On a total price of £550,000, using the ordinary residential rates stated in Nick’s explanation, the SDLT is £17,500.

Step four is to consider whether buying two dwellings gives any special relief. In many older discussions, buyers would look at Multiple Dwellings Relief. But for most current transactions, that relief has been abolished, so it should not be assumed to be available.

Step five is to consider whether the poor condition of the buildings changes the SDLT treatment. Usually it does not. If one dwelling is still habitable, it will normally be treated as residential. Even if a dwelling is in serious disrepair, the courts now apply a demanding test. Following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799, the condition threshold for showing a property is not suitable for use as a dwelling is relatively high. A building that is merely run down or in need of substantial renovation will not necessarily fall outside residential treatment.

Step six is to look ahead to a future transfer to children. SDLT is not a tax on gifts as such; it is a tax on chargeable consideration. So if one dwelling is later transferred outright with no payment and no mortgage or other debt is taken on by the children, there is generally no SDLT. If there is a mortgage and the children assume liability for part of it, that assumed debt can count as chargeable consideration and may create an SDLT charge.

Separate tax issues may arise on a later gift or rental arrangement, including Capital Gains Tax and Inheritance Tax, but those are distinct from the SDLT position on the initial purchase.

Outcome

On the facts given, the practical SDLT answer is this:

• the two purchases are likely to be linked transactions;
• the total consideration is therefore £550,000;
• if the buyers are replacing their main residence and do not trigger the additional dwelling rules, SDLT is charged at the ordinary residential rates; and
• the SDLT payable is £17,500.

A later gift of one dwelling to children would generally not attract SDLT if there is no chargeable consideration, including no mortgage being assumed.

Practical Steps

Anyone in this position should check the following before exchange or completion:

• whether they will have sold or otherwise disposed of their previous only or main residence by completion;
• whether either spouse owns any other dwellings anywhere that could affect the higher rates test;
• whether the two purchases are being documented as part of one overall arrangement, which may make them linked transactions;
• whether completion takes place after the abolition of Multiple Dwellings Relief, so that MDR cannot be claimed;
• whether any future transfer to children would involve a mortgage or other consideration;
• whether any later rental use could have Capital Gains Tax or income tax consequences; and
• whether any argument about a property being uninhabitable is realistic in light of Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799.

It is also sensible to ask the conveyancer to confirm the SDLT filing position in writing before completion, especially where there are two titles, two dwellings, or future family transfers are being considered.

Conclusion

Where a couple buy two dwellings together from the same seller for £550,000, the usual SDLT position is that the transactions are linked and taxed on the combined price. If they are replacing their main residence and do not own other dwellings that trigger the surcharge, the SDLT is £17,500 at the ordinary residential rates. The poor condition of the buildings does not usually change that result, and the threshold for saying a property is not suitable for use as a dwelling is now relatively high following Amarjeet and Tajinder Mudan v The Commissioners for HMRC [2025] EWCA Civ 799.

Legal References Used

• Finance Act 2003
• Finance Act 2003, Schedule 4ZA
• Finance Act 2003, Schedule 6B
• 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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