Westminster prices fell 25.4%, yet £5m+ sales rose 45% quarter-on-quarter. Islay Robinson examines why these figures are not contradictory, what they reveal about the changing prime London market, and why having finance ready can be critical when negotiating high-value property.

Why Falling Prime London Prices And Rising Transactions Are Not A Contradiction

Two sets of figures published this summer appear to tell opposite stories about prime London. ONS data, reported by The Times, shows prices in Westminster, the borough that covers Mayfair, Belgravia and St John's Wood, fell 25.4% in the year to June 2026. Over the same summer, Knight Frank and Savills reported transaction activity running above recent norms, with Savills recording a sharp increase on the previous quarter.

Most coverage has treated this as a contradiction, or reported one number and ignored the other. I don't think it is a contradiction. The two measures are looking at different moments in the same adjustment. Understanding the gap between them matters for anyone buying at the top of the London market over the next eighteen months, because it changes where the negotiating leverage sits and what it takes to use it.

What The Price Data Shows

The ONS figures show how deep the repricing has been in central London's most expensive boroughs. Westminster fell 25.4% in the year to June 2026, the City of London fell 20.4%, and Kensington and Chelsea fell 14.7%.

The ONS data is based on completed property transactions and the latest estimates remain subject to revision. The ONS also notes that areas with relatively low transaction volumes, including some London boroughs, can experience greater volatility depending on the number and type of properties sold in a particular period.

Several factors have changed the economics of owning prime London property for internationally mobile buyers. The previous non-dom tax regime was replaced by a residence-based system from April 2025, while non-UK residents purchasing residential property in England can also face a 2% Stamp Duty Land Tax surcharge on top of other applicable rates.

The government has also confirmed that the High Value Council Tax Surcharge will apply from April 2028 to residential properties in England valued at £2 million or more.

For context, Savills reports that prime central London values remain 26.3% below their 2014 peak. This is not a sudden collapse. It is the latest phase of an adjustment that has been running for more than a decade.

What The Transaction Data Shows

The activity figures point in a different direction. Knight Frank reported that transactions across prime central and prime outer London in the three months to August were 2% above the five-year average. Transactions were also higher than the same period a year earlier, although the comparison is affected by the unusually subdued market in 2025.

Savills recorded 107 sales above £5 million in prime central London during the second quarter of 2026, up 45% from the previous quarter. However, activity remained 7% below the same quarter of 2025, showing that the quarterly increase represents a recovery from a weaker period rather than a return to previous market conditions.

At the very top of the market, Beauchamp Estates recorded 34 transactions above £15 million during the first half of 2026, worth £1.24 billion in total. American buyers accounted for 30% of those transactions, while buyers from the Gulf accounted for a further 25%.

Why The Two Sets Of Figures Do Not Contradict Each Other

The important distinction is timing. The ONS index is built from completed sales registered with HM Land Registry. Recent transactions can take time to appear in the data, meaning an annual figure to June 2026 captures completed sales from a period in which much of the repricing was being agreed and completed.

Transaction counts from estate agents provide a more current view of market activity. Stock that has already been repriced can be taken up by a different group of buyers, even while average completed-sale prices remain under pressure.

One measure shows the depth of the price adjustment. The other shows whether transactions are taking place at the adjusted level. Both can therefore move in different directions without being inconsistent.

Borough-level price data at the top of the market should also be read with some care. Westminster records relatively few transactions compared with the wider housing market, and the mix of properties completing in a particular period can have a significant effect on the average. The ONS itself highlights the volatility that can arise from low transaction numbers.

Islay's View: What The Market Data Means For Buyers

In my view, the important point is that the headline price fall does not tell buyers everything they need to know about the current prime London market. The market is adjusting, but it is not adjusting uniformly. Some properties are attracting renewed interest while others are continuing to sit on the market and see price reductions.

For buyers, that makes the individual property more important than the headline market statistic. The strongest opportunities are likely to come from understanding how long a property has been available, how the asking price compares with recent comparable sales and how motivated the seller is.

Financing also matters. A buyer who has already established their financing position can move more quickly when the right property appears and can give the seller greater certainty around the transaction. In a market where transaction activity is beginning to recover, that certainty can become an important part of the negotiation.

Where The Negotiating Leverage Now Sits

LonRes puts the average discount from asking prices across prime London at 10.4%. For properties that take more than 12 months to sell, the average discount rises to 19.3%, compared with 3.9% for homes sold within three months.

That difference is significant for buyers assessing individual opportunities. A property that has remained on the market for a year or more is operating in a very different negotiating environment from one that has been correctly priced and attracts immediate interest.

A seller who has already absorbed a prolonged period of price reductions may be more willing to negotiate, but motivation alone does not produce a deal. The seller also needs a buyer who can proceed with certainty.

Speed At This Level Is A Financing Question

In a market moving through a reset, the buyer who can act when the right property appears may be better positioned than the one who still needs to arrange finance. At the prime end, the ability to move quickly is rarely just about how fast a client can make a decision. It is also about whether the financing structure is already in place.

A buyer who arrives with financing agreed in principle, rather than still to be sourced, can give a seller greater confidence that the transaction will complete. This can strengthen the buyer's negotiating position, although the outcome of any negotiation will depend on the property, the seller and the terms involved.

I'm seeing more of our clients treat arranging finance as something to settle before the search starts, not after an offer is on the table. For high-value borrowers, particularly those with complex or international income, lender assessment can take time, and that time is exactly what a competitive situation doesn't allow.

Who Is Buying Now

The profile of the buyer has shifted as well as the price. Black Brick's September 2026 market update describes a buyer base split between domestic purchasers looking for a main home and international buyers relocating or seeking a London base.

The same research suggests that speculative investors have become less prominent, with current buyers more focused on properties they intend to occupy or use over the longer term. It also points to a greater willingness among buyers to move forward despite the political and economic uncertainty that has affected the market in recent years.

That matches the tone of the conversations we are having. Buyers are pricing in the new tax environment and moving on with their decisions.

Prime London Has Decoupled From The Wider UK Market

Pantheon Macroeconomics has forecast UK house price growth of around 1% in 2026. Set alongside a 25% fall in Westminster, that illustrates how differently prime London's dynamics can behave from the wider UK market.

Prime London is particularly exposed to tax policy and international capital flows. These factors can have a greater influence on the prime market than the domestic affordability pressures shaping mainstream UK housing.

For overseas buyers deciding between buying and renting once tax and transaction costs are included, my view is that the calculation is more finely balanced than it has been for some time. That is a decision that depends heavily on individual circumstances and should be taken with specialist tax advice.

The 2028 Window

The High Value Council Tax Surcharge is due to take effect from April 2028 for residential properties in England valued at £2 million or more. The government has proposed four bands, ranging from £2,500 for properties valued between £2 million and £2.5 million to £7,500 for properties valued above £5 million.

This gives both sides of the market a defined period before the new holding cost is introduced. Buyers can factor the forthcoming charge into the overall cost of ownership, while sellers must consider how the additional annual cost could affect future demand for properties around the threshold.

The question for the next eighteen months is not whether prime London prices have fallen. They clearly have. It is whether the buyers now absorbing that stock keep coming as the 2028 changes approach, and whether the discounts on long-listed property narrow as they do.

The buyers best placed to navigate that window will be those who understand both the property and the full cost of acquiring and holding it, and who have considered their financing requirements before making an offer.

Your home may be repossessed if you do not keep up repayments on your mortgage. This article is for general information only and does not constitute tax, legal or investment advice. Enness Global Limited is authorised and regulated by the Financial Conduct Authority (FRN 565120).