Build to Rent and SDLT: What's Left After Multiple Dwellings Relief

For years, the standard way to make the SDLT on a large residential block work was multiple dwellings relief: average the price across the flats, apply the residential bands to that lower average, and the effective rate on a forward-funded Build to Rent scheme came out well below the headline. That route closed on 1 June 2024. What's left is a much older, much blunter rule that most people had never needed to think about — and getting the structure of the purchase contract right now matters more than it ever did.

Why multiple dwellings relief mattered so much to Build to Rent

Multiple dwellings relief let a buyer of two or more dwellings in a linked or single transaction calculate SDLT on the average price per dwelling, then multiply the result by the number of dwellings, subject to a minimum rate. On a 150-unit BTR block, averaging the price across every flat kept most of the purchase within the lower residential bands, which produced an effective rate that comfortably beat both the standard residential bands applied to the full consideration and, in many cases, the non-residential rates too. It was the relief that made forward-funding whole blocks of new residential stock arithmetically sensible for institutional capital.

1 June 2024: the relief ends

The Spring Budget 2024 abolished multiple dwellings relief for transactions with an effective date on or after 1 June 2024. There is a transitional exception: relief remains available where contracts were exchanged on or before 6 March 2024, provided those contracts were not varied afterwards. Outside that narrow window, it is gone — and no replacement relief was introduced specifically for Build to Rent, despite lobbying from the sector during the consultation. Any forward funding or forward commitment agreement signed after the transitional cut-off has to be priced on the rules that remain.

The rule that survived: six or more dwellings

Section 116(7) of the Finance Act 2003 is old, unglamorous, and untouched by the 2024 changes. It provides that where six or more separate dwellings are the subject of a single transaction involving the transfer of a major interest, or the grant of a lease over them, those dwellings are treated as not being residential property for SDLT purposes. The whole purchase is then taxed at the three-band non-residential rates — 0% up to £150,000, 2% up to £250,000, and 5% above that — rather than the steeper residential bands.

Because the charge is non-residential, none of the residential surcharges apply either: no 3% higher rate for additional dwellings under Schedule 4ZA, and no 2% non-resident surcharge for an overseas fund or SPV. On a 150-unit block bought for tens of millions of pounds, the difference between residential rates plus a surcharge and the flat non-residential bands is not a rounding error. For most Build to Rent transactions of any real size, section 116(7) is now doing the job MDR used to do, on its own.

The condition that decides everything: a single transaction

The rule only bites if six or more dwellings are acquired under a single transaction. HMRC's published view is that a single transaction means a single contractual obligation to take six or more dwellings — an overarching contract can still count even where completion happens in phases, under separate transfers, or over an extended build programme, as is normal on a phased BTR scheme. What does not qualify is six separate contracts for six separate dwellings that happen to complete on the same day with no overarching obligation binding them together.

This is precisely why forward funding agreements need to be drafted with SDLT in mind from the outset, not tidied up afterwards. A funding agreement structured as one contract to take the whole completed block, with phased practical completion and phased transfer of title, sits comfortably within section 116(7). The same economic deal split into a series of standalone unit purchase contracts, negotiated separately even if they close together, risks falling outside it. The legal structure of the agreement is doing real tax work, and it needs sign-off from someone who understands both sides before terms are agreed.

What this means for smaller portfolio purchases too

The six-or-more rule isn't exclusive to institutional BTR. A landlord or SPV buying six flats in a single converted block, or a small investor taking a parcel of new-build units off-plan under one contract, can use exactly the same rule. Before June 2024, many of these buyers would have compared MDR against the non-residential election and picked whichever came out lower. That comparison has gone: for a purchase of six or more dwellings under one contract, section 116(7) is now the only meaningful lever left, and it should be checked as a matter of course rather than assumed away because the deal "isn't really commercial".

What this means in practice

Any client contemplating a Build to Rent forward funding deal, or any portfolio purchase of six or more dwellings, needs the SDLT position modelled before heads of terms are signed, not after. That means checking whether the acquisition structure creates a genuine single transaction under section 116(7), pricing the deal on non-residential rates rather than assuming a relief that no longer exists, and making sure whoever is drafting the funding agreement understands why the contractual structure itself is part of the tax planning.

Common questions

Is multiple dwellings relief still available for Build to Rent purchases?

No. Multiple dwellings relief was abolished for transactions with an effective date on or after 1 June 2024, with a narrow transitional exception for contracts exchanged on or before 6 March 2024 that were not later varied. Build to Rent forward funding and forward commitment deals completing after that date cannot claim it, whatever the size of the scheme.

What is the six-or-more dwellings rule?

Section 116(7) of the Finance Act 2003 treats a purchase of six or more separate dwellings under a single transaction as non-residential property for SDLT purposes, so the purchase is taxed at the three-band non-residential rates of 0%, 2% and 5% instead of the higher residential bands, and without the residential surcharges.

What counts as a single transaction for the six-or-more dwellings rule?

HMRC treats a single transaction as a single contractual obligation to take six or more dwellings, even if completion happens in phases or under separate transfers, provided there is one overarching contract. Six dwellings bought under six genuinely separate contracts with no overarching obligation do not qualify, even if they complete on the same day.

Do the 3% and non-resident SDLT surcharges apply to a Build to Rent block bought under section 116(7)?

No. The Schedule 4ZA higher rate for additional dwellings and the 2% non-resident surcharge are both charges on the residential rates of SDLT. Once a purchase is treated as non-residential under section 116(7), those surcharges do not apply, which is one of the reasons the six-or-more rule remains attractive for larger portfolio and BTR acquisitions.

This article is general information, not personal tax or legal advice, and the rules referred to can change. Your own position depends on facts we cannot see from here — please take advice before acting on anything above.

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