Apartment 9, 1 William Street
SW1X 9HL, Kensington and Chelsea. A leasehold flat.
▾ 41.2% £1,050,000 less than it sold for in Sep 2025.
What brings you to this home?
Thanks, noted.
The sales further down show what similar homes nearby sold for.
Watch William Street further down for an email when a home on it sells.
Have a look around.
Home Report
Everything about Apartment 9, 1 William Street in one PDF
Things to check before you offer, every sale in SW1X 9 in the last 12 months, crime, schools and stations.
Found for Apartment 9, 1 William Street
Against SW1X
−£336,346
Below the typical SW1X flat, £1,836,000, Sep 2025 to Aug 2026.
£1,836,000 This flat
£1,500,000
On William Street
6th of 6
Flat sales since 2023, by price. The street's typical is £8,925,000.
SW1X by year
£1,550,000
Typical SW1X flat in 2026 so far, down 42.9% since 2023.
Resold in SW1X
9 of 11 up
SW1X flats sold twice since 2023. Typical change +59.0%.
Lease
A 999-year lease from 1 Jan 2022. 994 years were left when it sold in January 2026.
Want the lease in detail? Check this flat on Lease Length Check, free.
Watch William Street
Free. An email when a home on William Street sells, at most one a month.