3Y Avg Price
£5,475,000
4 sales
Properties
6
Sales / Year
0.8
5-year average
Avg £/sq ft
£2,112
£22,732/m²
Rank in SW1X
13th
of 56 streets
Last Sale
£1,500,000
Jan 2026
Price History
Every recorded sale on this street, coloured by property type.
Last 10 Sales
9 total recorded
APARTMENT 9, 1 William Street
Flat/Maisonette
£1,500,000
Jan 2026
APARTMENT 9, 1 William Street
Flat/Maisonette
£2,550,000
Sept 2025
APARTMENT 7, 1 William Street
Flat/Maisonette
£2,650,000
Mar 2024
APARTMENT 4, 1 William Street
Flat/Maisonette
£15,200,000
Sept 2023
1, WILLIAM STREET HOUSE, 1 - 9 William Street
Flat/Maisonette
£270,000
Apr 2009
FLAT 5, WILLIAM STREET HOUSE William Street
Flat/Maisonette
£1,850,000
Aug 2004
FLAT 5, WILLIAM STREET HOUSE William Street
Flat/Maisonette
£1,250,000
Jul 2002
FLAT 5, WILLIAM STREET HOUSE William Street
Flat/Maisonette
£763,250
Aug 1999
FLAT 1, WILLIAM STREET HOUSE William Street
Flat/Maisonette
£400,000
Jan 1996
Street Rankings — SW1X
Streets ranked by 3-year average sale price. Showing positions 9–18 of 56.
| # | Street | 3Y Avg |
|---|---|---|
| 9 | Chester Street | £7,990,000 |
| 10 | Wilton Street | £7,850,000 |
| 11 | Montrose Place | £7,250,000 |
| 12 | Halkin Mews | £5,734,220 |
| 13 | William Street | £5,475,000 |
| 14 | William Mews | £5,250,000 |
| 15 | Wilton Row | £5,000,000 |
| 16 | Hans Place | £4,763,366 |
| 17 | Chapel Street | £4,612,500 |
| 18 | Upper Belgrave Street | £4,542,500 |
Property Mix
Type
Tenure
EPC Ratings
2 of 6 properties have an EPC record
Avg floor area: 1,841 sq ft (171 m²)
District Context — SW1X
SW1X covers Knightsbridge, Belgravia, and parts of Mayfair in central London's most prestigious postcodes. It is one of the capital's most exclusive and affluent residential neighbourhoods, characterised by grand Victorian and Georgian properties and world-class amenities.
Average Property Price - SW1X
£3,391,363
100
National percentile
Average Net Household Income - SW1X
£68,642
100
National percentile
10-Year Annualised Price Growth - SW1X
-1.5%
1
National percentile
10-Year Annualised Rent Growth - SW1X
3.2%
11
National percentile