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Sold prices and estimated values

Property Valuations in WILLIAM STREET, Westminster SW1X

See what homes on William Street have sold for, what they could be worth today, and the highest prices recorded for each type of property.

Highest sold prices on WILLIAM STREET

The highest recorded sale on WILLIAM STREET is £23,250,000 at APARTMENT 6, 1, WILLIAM STREET, CITY OF WESTMINSTER, GREATER LONDON SW1X 9HL, sold on 21 November 2025

Property type Highest sale Address Sale date
Flat / Maisonette £23,250,000 APARTMENT 6, 1, WILLIAM STREET, CITY OF WESTMINSTER, GREATER LONDON SW1X 9HL 21 Nov 2025

These historic sales (often known as ceiling prices) can help provide context when assessing potential development values on the street.

APARTMENT 4, 1, WILLIAM STREET, CITY OF WESTMINSTER, GREATER LONDON SW1X 9HL

Tenure: Leasehold
Property Type: Flat
Weighted central estimate: £12,336,851
Weighted central estimate £/m²: £37,612
Previous sales
29 Sep 2023 - £15,200,000

APARTMENT 6, 1, WILLIAM STREET, CITY OF WESTMINSTER, GREATER LONDON SW1X 9HL

Tenure: Leasehold
Property Type: Flat
Weighted central estimate: £13,253,584
Weighted central estimate £/m²: £28,320
Previous sales
21 Nov 2025 - £23,250,000
21 Nov 2025 - £23,250,000

APARTMENT 7, 1, WILLIAM STREET, CITY OF WESTMINSTER, GREATER LONDON SW1X 9HL

Tenure: Leasehold
Property Type: Flat
Weighted central estimate: £2,029,121
Weighted central estimate £/m²: £22,546
Previous sales
12 Mar 2024 - £2,650,000

APARTMENT 9, 1, WILLIAM STREET, CITY OF WESTMINSTER, GREATER LONDON SW1X 9HL

Tenure: Leasehold
Property Type: Flat
Weighted central estimate: £2,232,065
Weighted central estimate £/m²: £24,801
Previous sales
20 Jan 2026 - £1,500,000
30 Sep 2025 - £2,550,000

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