Supply in the London luxury property market contracted noticeably in the third quarter of 2025. According to recent research by estate agency Benham and Reeves, the number of properties for sale in the prime segment fell by 3.4 per cent in the three months to September 2025.
This decline in active listings highlights noticeable hesitation among owners in the British capital. Rather than actively listing homes, many potential vendors are adopting a wait-and-see stance, monitoring further market developments from a distance.
Tax policy discussions dampen supply
This tightening of supply coincides with speculation surrounding imminent fiscal interventions. Reports indicated that Chancellor of the Exchequer John Healey was considering lowering the threshold for the so-called mansion tax during this period. A reduction of the exemption limit from £2 million to £1.5 million was under discussion.
Such a reform would significantly widen the scope of potentially affected properties in London. While high-value properties priced at over £2 million traditionally form the core of the prime market, a threshold of £1.5 million would subject numerous further homes in the upper tier to such a special levy.
- —3.4 per cent fall in active sales listings in London's prime segment in the quarter to September 2025
- —Statistical survey and publication by estate agency Benham and Reeves
- —Lowering of the mansion tax threshold under consideration by Chancellor of the Exchequer John Healey
- —Potential reduction of the threshold from the previous £2 million to £1.5 million
Sensitivity at the top end of the market
The data from Benham and Reeves highlights the pronounced sensitivity of London's prime market to tax conditions. Announcements or even mere rumours of higher tax burdens routinely prompt vendors in the prime sector to put sales plans on hold until dependable statutory parameters are established.
Whether this drop in listings will persist over the coming months or reverse if tax changes fail to materialise depends largely on further decisions by the British government. Until definitive clarity is reached, the supply of high-end residential property in London remains at the reported lower level.
