A Gulf family that wants £5,000,000 to £20,000,000 of London residential income without buying ten flats in ten buildings buys a block: one freehold, six to thirty flats, one managing agent, one insurance policy, one decision. Buying a whole block is taxed differently, financed differently and sold by different people from the single-flat market, and the due diligence is a portfolio’s, not a home’s. The six-dwelling rule is why a block costs less to buy than its flats.
Tax
Buying a whole block: the six-dwelling rule, non-residential stamp duty, and the due diligence on a portfolio
Why a block
A Gulf family buying six or more flats in one transaction from one seller can treat the purchase as non-residential for stamp duty: 0 per cent to £150,000, 2 per cent to £250,000 and 5 per cent above, with no additional-property, non-resident or 17 per cent company surcharge. On an £8,000,000 block of eight flats that is £389,500 against £910,000 for the same flats bought one by one. The catch is the cliff at six: multiple dwellings relief was abolished on 1 June 2024, so five flats pay full surcharged residential rates.
Income at scale, one freehold instead of six leases, control of the building and its service charge, the ability to improve the whole and reprice it, and a tax treatment on purchase that is a fraction of the single-flat rates. Against that: concentration in one building and one street, a larger single cheque, management that cannot be delegated to a porter, and a thinner market when the family comes to sell. The firm’s clients who own blocks tend to own two or three in different districts, bought over a decade, through a company, with a professional managing agent and an annual visit.
The six-dwelling rule for non-residential stamp duty
Where six or more dwellings are bought in a single transaction, the purchaser may treat the purchase as non-residential for stamp duty. The non-residential rates are 0 per cent to £150,000, 2 per cent to £250,000 and 5 per cent above, charged on the whole price, with no 5 per cent additional-property rate, no 2 per cent non-resident surcharge, and no 17 per cent company rate, whoever the buyer is.
The stamp duty cliff at six dwellings after 2024
Multiple dwellings relief, which used to soften purchases of two to five flats, was abolished on 1 June 2024, so a purchase of five flats is taxed as five residential purchases at the full surcharged rates and a purchase of six as a non-residential transaction; the cliff at six is real and the firm has seen a buyer add a sixth flat to a deal for that reason alone.
The dwellings must be in one transaction (or linked transactions) from one seller; six flats bought from six sellers do not qualify.
Stamp duty arithmetic for the same eight flats
The stamp duty on the same eight flats, bought three different ways:
Stamp duty on an £8,000,000 block of eight flats, 2026
| £8,000,000 block of eight flats, bought by a non-UK company | Stamp duty |
|---|---|
| Treated as non-residential under the six-dwelling rule: 0 per cent to £150,000, 2 per cent to £250,000, 5 per cent on £7,750,000 | £389,500 |
| If instead the eight flats were bought one by one at £1,000,000 each, each as a residential purchase by a non-resident company with the letting relief: ordinary rates £43,750 + 5 per cent £50,000 + 2 per cent £20,000 = £113,750 each | £910,000 |
| Without the letting relief, at the company rate of 17 per cent plus 2 per cent | £1,520,000 |
Source: GOV.UK Stamp Duty Land Tax non-residential and mixed-use rates; HMRC SDLT manual SDLTM29905 and SDLTM29900; firm’s calculation, October 2026.
The block saves half a million pounds on purchase against the same flats bought separately, before any discount for buying the whole. Our guide on stamp duty for overseas buyers gives the residential bands; the non-residential bands are on the GOV.UK page in the sources.
Where blocks of flats come from and how they are sold
Family estates selling after a death; small property companies unwinding; housing associations disposing of street properties; developers selling a completed building whole to an investor rather than flat by flat; receivers and lenders; and auctions, where our guide on buying at auction from abroad explains the process. Blocks are sold through the investment departments of the larger agents and through specialist block agents, with an information memorandum, a tenancy schedule and a data room; the firm’s clients see them before the brochure because the firm asks.
How investment blocks of flats are priced on yield
Prices are quoted on a yield: a London block of flats let on ordinary tenancies trades at 4 to 5.5 per cent gross in 2026, higher in the regional cities, and the discount to the sum of the flats’ individual values is 10 to 20 per cent.
Tenancy due diligence when buying a block of flats
Every flat’s tenancy agreement, deposit protection certificate, prescribed information, gas and electrical certificates, energy certificate, right-to-rent check and rent history; the arrears schedule; any regulated tenancies from before 1989 (a sitting tenant at a fair rent with security for life, which discounts that flat heavily); any tenant with a possession claim or a complaint pending; and, since the Renters’ Rights Act, the Information Sheet served on each existing tenant by 31 May 2026, as our guide on the Act explains.
The schedule’s rents are checked against the bank statements, not the seller’s spreadsheet. A block with one flat empty and six let is priced on the six and the seventh is the upside.
Freehold and fabric
The freehold title and any head lease; whether the flats are on long leases to the occupiers (in which case the buyer is buying a ground-rent and management interest, not the flats) or let on short tenancies by the freeholder (the usual investment block); the building’s safety position under the Building Safety Act, which for a block over 11 metres means an accountable person, a safety case and possibly a remediation history, as our guide on service charges and building safety sets out.
Survey, planning history and insurance for a whole block
A Level 3 survey of the whole building, with the roof, the drains, the lifts and the fire systems; the planning history and any enforcement; and the asbestos register. The insurance is the buyer’s, from completion, and the premium on a block with a cladding history is a line in the yield.
Finance for buying a block, including Sharia-compliant options
Commercial lenders and the private banks lend on blocks at 55 to 65 per cent of value, on the rental income, to a company borrower, at margins of 2 to 3.5 per cent over base; the valuation is of the block as an investment, on the yield, not of the flats. Sharia-compliant finance for a block is available from Gatehouse and from the Gulf banks’ London branches on a commodity murabaha or ijara structure for larger sums.
Timetable for a block purchase from the Gulf
The lender’s due diligence duplicates the buyer’s and takes three months; a block purchase from the Gulf is a six-month project from the information memorandum to the keys, and our guide on remortgaging covers the refinance once the block is improved and repriced.
Holding and managing
A block is nearly always held through a company, UK or non-UK, for the reasons our guide on company ownership sets out: the letting-business reliefs from the 17 per cent rate and from the Annual Tax on Enveloped Dwellings apply, corporation tax on rent and gains is lower than income tax for a non-resident without the personal allowance, and finance interest is fully deductible. A non-UK company registers on the Register of Overseas Entities.
Choosing a managing agent for a block of flats
The block is managed by a managing agent on a percentage of rent, with the firm or a London director reviewing quarterly; the owner visits once a year. Our guide on choosing a letting agent from abroad applies to block agents with one addition: ask how many blocks of this size they manage, and visit two.
Sources: Stamp Duty Land Tax: non-residential and mixed-use rates (GOV.UK) · SDLT manual: six or more dwellings (HMRC SDLTM29905) · SDLT manual: multiple dwellings relief abolished from 1 June 2024 (HMRC SDLTM29900) · Building Safety Act 2022 (legislation.gov.uk). Checked against GOV.UK on 14 October 2026: the six-or-more dwellings rule, the non-residential stamp duty rates, the abolition of multiple dwellings relief from 1 June 2024, and the corporate rate reliefs. Yields and finance terms are indicative. General information, not tax or investment advice; a block purchase needs a tax adviser, a solicitor and a surveyor from the first conversation. Figures verified 14 October 2026.
Frequently Asked
Questions about buying a whole block of flats
Yes, if they are bought in one transaction from one seller; developers sell “bulk” lots of six or more to investors for exactly this reason, and the discount for taking six is additional.
It can, but the flat used by a family member breaks the letting-business reliefs for the company that holds it; buy the family flat separately in a personal name, or keep the block entirely let.
Four to five and a half per cent gross on a London block of ordinary flats, five and a half to seven in the regional cities, before the management, insurance and maintenance of a whole building; our guide on London rental yields by area gives the borough context.
0 per cent to £150,000, 2 per cent to £250,000 and 5 per cent above, charged on the whole price. There is no 5 per cent additional-property rate, no 2 per cent non-resident surcharge and no 17 per cent company rate, whoever the buyer is. The full bands are on the GOV.UK non-residential rates page.
Treated as non-residential under the six-dwelling rule, an £8,000,000 block of eight flats bought by a non-UK company pays £389,500. The same eight flats bought one by one at £1,000,000 each, as residential purchases by a non-resident company with the letting relief, pay £113,750 each, or £910,000 in total. Without the letting relief, at the 17 per cent company rate plus 2 per cent, the figure is £1,520,000. The block saves half a million pounds before any discount for buying the whole.
No. Multiple dwellings relief, which used to soften purchases of two to five flats, was abolished on 1 June 2024. A purchase of five flats is now taxed as five residential purchases at the full surcharged rates; a purchase of six in one transaction is a non-residential transaction. The cliff at six is real, and the firm has seen a buyer add a sixth flat to a deal for that reason alone.
No. The dwellings must be in one transaction, or linked transactions, from one seller. Six flats bought from six sellers are six residential purchases at the full surcharged rates.
Commercial lenders and the private banks lend at 55 to 65 per cent of value, on the rental income, to a company borrower, at margins of 2 to 3.5 per cent over base. The valuation is of the block as an investment, on the yield, not of the flats. Sharia-compliant finance is available from Gatehouse and from the Gulf banks’ London branches on a commodity murabaha or ijara structure for larger sums.
About six months from the information memorandum to the keys. The lender’s due diligence duplicates the buyer’s and takes three months on its own. A block purchase needs a tax adviser, a solicitor and a surveyor from the first conversation.
Nearly always, UK or non-UK. The letting-business reliefs from the 17 per cent rate and from the Annual Tax on Enveloped Dwellings apply, corporation tax on rent and gains is lower than income tax for a non-resident without the personal allowance, and finance interest is fully deductible. A non-UK company registers on the Register of Overseas Entities. See our guide on company ownership.
