Knightsbridge · SW1X
William Street
The registered record for William Street runs to 3 sales, and the middle of that range is £2.55m. Prices have ranged from £1.50m to £23.25m, so an asking price only makes sense once you have seen the specific floor, aspect and state of repair. 100% of what sold was flats, and 3 of the last 3 were leasehold — worth checking the term before you offer. The most recent registered sale went through on 20 Jan 2026.
For a wider view of the market around it, see Knightsbridge house prices.
- Registered sales
- 3
- Median price paid
- £2.55m
- Range
- £1.50m–£23.25m
Recent sold prices on William Street
| Address | Date | Type | Tenure | Price paid |
|---|---|---|---|---|
| 1 William StreetSW1X 9HL | 20 Jan 2026 | flat | leasehold | £1.50m |
| 1 William StreetSW1X 9HL | 21 Nov 2025 | flat | leasehold | £23.25m |
| 1 William StreetSW1X 9HL | 30 Sept 2025 | flat | leasehold | £2.55m |
Source: HM Land Registry Price Paid Data, latest registered sale 20 Jan 2026. Contains HM Land Registry data © Crown copyright and database right 2026, licensed under the Open Government Licence v3.0.
Full price history: William Street sold prices