Prime London's Summer of Uncertainty: What the Burnham Government Means for High-Value Buyers and Sellers

Six days ago, Andy Burnham was sworn in as Britain’s seventh Prime Minister in a decade, having been acclaimed Labour leader on 17 July following Sir Keir Starmer’s resignation. For a market that had barely settled after the last change of leadership, prime London property is once again bracing for what one of the major agencies has already called “a summer of uncertainty.”

I have been buying, selling and advising on prime London property since 1982. I have seen chancellors come and go, stamp duty reformed more times than I care to count, and every conceivable prediction of market collapse fail to materialise. What I have learned in over four decades is this: uncertainty creates opportunity for those who act on facts, and paralysis for those who wait for a headline to tell them what to do. Right now, the facts in prime London are genuinely more interesting than the headlines suggest.

A Market Sending Mixed Signals

The topline numbers, on their own, look soft. Average prices across prime central London fell 3.6% in the year to June — the second consecutive month at that rate of decline — and transaction volumes over the same period were down 14% year-on-year. Look at the first half of 2026 as a whole and completed transactions are down 12.7% against the same period last year.

Read only that far and you would assume prime London is in retreat. You would be wrong.

Under-offer numbers — the properties currently being transacted, not simply advertised — are up 8.3% annually and sit 27.4% above the 2017–2019 average. Buyer demand across the prime market strengthened through the second quarter, and the super-prime segment has also improved. That gap between "sold" and "under offer" tells you where the market is heading over the next two to three months, not where it has been.

Nowhere is this clearer than in London’s family-focused prime neighbourhoods. Clapham currently has the highest conversion rate of any prime location — 47.6% of homes listed between £2 million and £10 million have secured a buyer. Wandsworth follows at 43.3%, Chiswick at 37.8%, Putney at 32.5%, and Islington at 32.4%. These are established, family-driven prime pockets where genuine demand is outpacing supply, price softness elsewhere notwithstanding.

Why the Change of Government Matters to Prime Buyers

The political backdrop is unusually live for prime property owners. Burnham’s early positioning has included discussion of capital gains tax reform, and — more strikingly — proposals to replace stamp duty and council tax with a land value tax, alongside a large-scale social housebuilding programme and greater devolved tax-raising powers for regional government. None of this is confirmed policy. But speculation of this kind has historically been enough, on its own, to move behaviour in the £2 million-plus bracket, where clients plan years rather than months ahead.

What a Land Value Tax Could Mean

Replacing stamp duty with a land value tax would be one of the most significant structural changes to UK property taxation in a generation. For prime buyers, the practical question is timing: a purchase completed under the current stamp duty regime is a known cost; a purchase delayed into a new regime is not. Clients who are already committed to a purchase have, in nearly every case I have discussed this with over the past week, chosen to proceed rather than wait for clarity that may be months or years away.

What Capital Gains Tax Reform Could Mean

For owners of investment property and second homes considering a sale, any reform to CGT is worth watching closely — but watching is not the same as waiting indefinitely. Rates and reliefs can change with a single fiscal statement, and clients who have held appreciating assets for years are, sensibly, taking professional advice now on whether their current position still serves them under a new government, rather than assuming today’s rules will still apply next spring.

Our View: Act on the Facts You Can See

That mantra matters more than usual in a market like this one, because it is precisely the moment when nervous commentary tempts good buyers and sellers into indecision. The facts in front of us are: prime family neighbourhoods are converting sales at their fastest rate in years, under-offer activity is rising even as headline prices soften, and genuine off-market stock continues to move at pace for buyers who are ready to act with certainty.

Political uncertainty in Westminster has never yet closed the gap between a well-priced property in a neighbourhood buyers actually want, and a buyer who wants it. It has, however, repeatedly rewarded those who moved decisively while others waited for the fog to clear — and penalised those who held out for perfect conditions that took years to arrive, if they arrived at all.

What This Means If You’re Buying or Selling in Prime London Now

If you are a seller with a property in a strong-demand pocket — Clapham, Wandsworth, Chiswick and similar areas are currently converting well above the wider prime average — this is a window worth using, not waiting through. If you are a buyer, softening headline prices combined with policy uncertainty are, historically, exactly the conditions under which the most attractive off-market opportunities surface, often before they reach the open market at all.

Every client’s position is different, and any decision involving tax exposure should be discussed with your accountant or solicitor before you act — the detail of any Burnham government tax reform is not yet settled, and we would not advise treating speculation as fact.