When the Rich Leave, Who Buys the Mansion? London's £15M+ Listings in 2026

Published on: June 15, 2026

For two centuries, London's grandest houses changed hands quietly between people who already lived in the city. The mansion on Eaton Square or the lateral apartment overlooking Hyde Park stayed within a closed circle of established wealth. In 2025 and into 2026, that circle has broken open, and the reason tells you almost everything about where global capital is moving and why.

The trigger was tax. When the United Kingdom abolished its non-domiciled ("non-dom") regime from April 2025, it ended a two-hundred-year-old arrangement that had let wealthy foreign residents avoid UK tax on their overseas income. The departures that followed reshaped the top of the London market. But the more interesting story is not who left. It is who arrived to buy what they left behind, and at what price.

This article unpacks the data on London's super-prime segment (homes priced above £15 million) for 2026: the sellers, the new buyers, the price corrections, and what the shift means for any cross-border investor weighing London against rival wealth hubs like Dubai, Milan, or Monaco.

The supply shock: why so many mansions came to market at once

London's super-prime supply did not grow because developers built more. It grew because owners left.

According to Beauchamp Estates' annual Billionaire Buyers in London survey, which tracks every residential sale above £15 million, roughly two-thirds of the vendors selling these homes in 2025 were wealthy non-doms disposing of their principal London residence and relocating to lower-tax jurisdictions. Their primary destinations were Dubai and Abu Dhabi, Milan and Tuscany, Monaco, and Geneva.

The mechanism is straightforward. Under the old system, a non-dom resident in the UK could elect the "remittance basis" and pay UK tax only on income brought into the country. From April 2025, all UK tax residents became liable for tax on worldwide income and gains, and after ten years of residence their global assets fall into the UK inheritance tax net at 40%. For a family with most of its wealth held offshore, the arithmetic changed overnight.

Henley & Partners projected a net loss of around 16,500 millionaires from the UK in 2025, the largest single-year outflow the firm has recorded in a decade of tracking, and the first year a European country topped the global millionaire-departure leaderboard ahead of China. Estimates for the liquid wealth leaving with them range from £66 billion upward.

A noteworthy detail for buyers: many departing non-doms did not cut ties entirely. A significant share retained a London foothold by trading their flagship £15M+ residence for a smaller property in the £7M–£10M band, keeping a base in the city while shedding the tax exposure of full residence. That behaviour added a second layer of supply to the segment just below super-prime.

The price reset: London on sale, by super-prime standards

More supply met cooler demand, and prices adjusted.

Beauchamp Estates forecasts that prices for homes above £15 million will soften by a further 2% to 3% in 2026, with the segment not expected to return to positive growth until 2027 at the earliest. The gap between average asking price and average achieved price widened to roughly -7.6% in 2025, meaning sellers are routinely accepting offers well below the headline number.

For an international buyer, this is the headline opportunity. Prime Central London assets that rose almost continuously for decades are now repricing downward, while rival wealth hubs, notably Dubai and Abu Dhabi, have seen prices climb sharply. The relative value argument has flipped. Several agencies now describe London super-prime as offering genuine value and a stable, liquid market precisely because of the correction, not in spite of it.

One pattern stands out: buyers in 2025 paid up for quality and finish, not for projects. The number of super-luxury new-build apartments sold above £15M rose to 13 (from 10 in 2024), averaging around 6,063 sqft at roughly £3,765 per square foot, the premium reflecting turn-key, newly finished status. Appetite for redevelopment projects, by contrast, fell sharply. The market is rewarding move-in-ready prestige and discounting anything that requires work.

So who is actually buying?

This is where the composition of demand has changed most. The buyer of a London mansion in 2026 looks very different from the buyer of 2019.

Middle Eastern and Turkish buyers: the new plurality

Combined, Middle Eastern and Turkish buyers are forecast to be the single largest buyer group for London homes above £15 million in 2026, roughly one in three purchasers. This includes families originally from India, Pakistan, Yemen, and Lebanon who are now based in the UAE or Saudi Arabia, as well as a smaller but growing cohort of Turkish buyers moving capital out of a volatile domestic economy into a hard-asset, hard-currency store of value.

That last group is worth dwelling on. For a Turkish investor, a London prime asset is not primarily a lifestyle purchase; it is a capital-preservation play denominated in sterling, in a jurisdiction with deep legal protections for property rights. The motivation is closer to buying gold than buying a holiday home.

Americans: still major, but cooling

US buyers accounted for about 20% of super-prime sales in 2025, down from 25% in 2024. They remain one of the largest single nationalities, drawn by London's combination of language, legal stability, and a weaker pound, but their share is gradually easing as some redirect toward European alternatives.

China, Hong Kong, and South Asia: steady

Buyers from China and Hong Kong rose to around 13% (from 12%), while buyers from India and the wider South Asia region held steady at about 20%. These are durable, long-horizon buyers treating London as a secure global base rather than a tactical trade.

The British themselves: quietly returning

Domestic UK buyers rose to about 12% of super-prime sales (from 10%), partly as repricing brought trophy assets within reach of established British wealth that had been priced out during the boom years.

A structural shift sits underneath these numbers: cash. Roughly 75% of super-prime transactions in 2025 were all-cash, consistent with the prior year. At this end of the market, financing is a convenience, not a necessity, which insulates the segment from interest-rate swings that move the mainstream market.

A younger, more decisive buyer

Beauchamp Estates noted that £15M+ buyers in 2025 skewed markedly younger than in previous years, frequently from their late twenties to mid-forties. This is the generation of tech-, finance-, and family-office wealth, and it buys differently: decisively, with a strong preference for turn-key quality and long-term usability over speculative upside. They are less interested in "doing up" a Belgravia townhouse and more interested in moving in next month.

Geographically, the activity concentrated in the established prestige postcodes. Belgravia was the standout winner of 2025, accounting for 8 of the 41 deals above £15M (up from just 3 the prior year), following a wave of vendor-led repricing and refurbishment. Chelsea, Knightsbridge, and the West End remained the most active districts, while Mayfair is positioned for a rebound whenever the right stock appears, with appetite strong but supply tight.

There is also a quieter structural story in north London: parts of Hampstead and The Bishops Avenue, once defined by enormous single-family mansions, are being redeveloped into lateral apartments and luxury flats, a sign that even the supply of true trophy houses is being reshaped by changing demand.

What this means for a cross-border investor

If you are evaluating London against other global wealth hubs, four practical takeaways emerge from the 2026 picture.

1. The discount is real but disciplined. Asking-to-achieved gaps near -8% mean there is genuine room to negotiate, but only on correctly positioned assets. Over-priced or project properties are sitting; turn-key prime is still competitive.

2. London is now a relative-value play, not a growth play. With prices forecast to fall a further 2–3% in 2026 and no growth expected before 2027, the case for buying now rests on capital preservation, currency, and legal security, not near-term appreciation.

3. The buyer pool has globalised, which supports liquidity. A market sustained by Middle Eastern, Turkish, South Asian, American, and Chinese demand simultaneously is less dependent on any single economy. That diversification is itself a form of downside protection for an owner who may want to sell in five or ten years.

4. Compare the full picture, not just the headline price. A London purchase now carries different tax consequences than it did before April 2025. Stamp duty, the post-non-dom income and inheritance regime, and running costs all need to sit alongside the price discount in any honest comparison with Dubai, Milan, Monaco, or Lisbon.

Frequently asked questions

Are London property prices actually falling in 2026?

At the top of the market, yes. Homes priced above £15 million are forecast to soften by a further 2% to 3% in 2026, with achieved prices already running roughly 7–8% below asking. The mainstream London market behaves differently; this correction is specific to the super-prime segment.

Why are wealthy people leaving London?

The principal driver is the April 2025 abolition of the non-dom tax regime, which made worldwide income and gains taxable for UK residents and exposed global assets to UK inheritance tax after ten years. Many high-net-worth residents relocated to lower-tax hubs such as Dubai, Abu Dhabi, Milan, Monaco, and Geneva.

Who is buying London's most expensive homes now?

The buyer base has globalised. Middle Eastern and Turkish buyers together are forecast to be the largest group in 2026 (around one in three), alongside steady demand from South Asia, the United States, China and Hong Kong, and a renewed presence of domestic British buyers.

Is it a good time for a foreign buyer to purchase in London?

For a buyer focused on capital preservation, currency exposure to sterling, and legal security, the current correction creates an entry point not seen in years. For a buyer seeking short-term appreciation, the market is not expected to grow again before 2027. The right answer depends on your objective, and on the full after-tax cost of ownership.

Where are London's departing non-doms buying instead?

Predominantly Dubai and Abu Dhabi, Milan and Tuscany, Monaco, and Geneva, destinations combining favourable tax regimes with established luxury markets and structured residency pathways.

The mansions of Belgravia and Knightsbridge are not sitting empty. They are simply changing hands across borders rather than within them, passing from a generation of tax-driven residents to a global pool of buyers who view London as a secure, now-discounted store of wealth. The question for any cross-border investor is no longer whether London is expensive. It is whether London, repriced, belongs in a portfolio that also weighs Dubai, Milan, and Lisbon.

That is exactly the comparison JanusHermes is built for. Search and compare prime listings across 50+ countries, analyse market data side by side, and model the cross-border picture before you commit.

Sources: Beauchamp Estates "Billionaire Buyers in London" survey (December 2025); Henley & Partners Private Wealth Migration Report 2025; Spear's; Property Investor Today; Estate Agent Today.

JanusHermes is the global real estate investment platform for cross-border investors, covering 50+ countries in 11 languages. This content is for information only and is not tax, legal, or investment advice.

A note on the numbers: where no source is named, the market figures in this article (prices, yields, costs) are indicative estimates compiled from publicly available market data and industry reporting at the time of writing. Markets move and rules change, so treat them as a starting point and verify current figures with official sources before acting on them.