William Street - SW1X 9HL
Key Postcode Insights
SW1X 9HL is a residential postcode situated on William Street, London, SW1 with 12 addresses.
It ranks as the 827th largest and 1790th most expensive of the 1,802 postcodes in the SW1X area. The most common property type is a modern flat built after 1980.
The postcode contains a total of 12 properties: 12 flats.
- Ave. Sale Price
- £9,550,169
- 10 Year change
- down 12.0%
- Ave. Rental Price
- £27,611pcm
- 10 Year change
- up 42.9%
- Ave. £ per ft²
- £3,793/ft²
- Ave. Gross Yield
- 3.5%/year/yr
Key Postcode Insights
SW1X 9HL is a residential postcode situated on William Street, London, SW1 with 12 addresses.
It ranks as the 827th largest and 1790th most expensive of the 1,802 postcodes in the SW1X area. The most common property type is a modern flat built after 1980.
The postcode contains a total of 12 properties: 12 flats.
- Ave. Sale Price
- £9,550,169
- 10 Year change
- down 12.0%
- Ave. Rental Price
- £27,611pcm
- 10 Year change
- up 42.9%
- Ave. £ per ft²
- £3,793/ft²
- Ave. Gross Yield
- 3.5%/year/yr
Explore Propertiesin SW1X 9HL
- 1 William Street
Modern Building | 9 Units
- 3 William Street
Unknown
- 4 William Street
3 Bed Period Flat
- 7 William Street
Unknown
Sales Market Trends
The last sale in SW1X 9HL sold for £2,550,000 on 30th September 2025. Since then prices are up an average of 2.4%.
The current average value in the postcode is £9,550,169.
The SW1X 9HL Sales Market has decreased by 12.0% over the last 10 years.
| Period | Year on Year | Average Price |
|---|---|---|
| June 2026 | 0.2% | £9,550,169 |
| June 2025 | -2.3% | £9,534,149 |
| June 2024 | -2.9% | £9,762,344 |
| June 2023 | 1.1% | £10,054,886 |
| June 2022 | 3.6% | £9,941,519 |
| June 2021 | -4.1% | £9,599,843 |
| June 2020 | 2.4% | £10,010,124 |
| June 2019 | -3.4% | £9,773,221 |
| June 2018 | -4.6% | £10,116,623 |
| June 2017 | -2.2% | £10,606,994 |
| June 2016 | -3.1% | £10,849,847 |
| June 2015 | -0.3% | £11,200,403 |
| June 2014 | 12.6% | £11,233,586 |
| June 2013 | 10.9% | £9,973,588 |
| June 2012 | 16.1% | £8,993,947 |
| June 2011 | 11.6% | £7,747,328 |
| June 2010 | 12.6% | £6,943,970 |
| June 2009 | -6.4% | £6,167,323 |
| June 2008 | 15.1% | £6,591,584 |
| June 2007 | 0% | £5,726,775 |
Rental Market Trends
The current average rental value in the postcode is £27,611.
The SW1X 9HL Rental Market has increased by 42.9% over the last 10 years.
| Period | Year on Year | Average Price |
|---|---|---|
| June 2026 | 9% | £27,611pcm |
| June 2025 | 3.9% | £25,323pcm |
| June 2024 | -0.3% | £24,368pcm |
| June 2023 | 13.8% | £24,439pcm |
| June 2022 | 24.7% | £21,469pcm |
| June 2021 | -8% | £17,221pcm |
| June 2020 | -5.1% | £18,710pcm |
| June 2019 | 2% | £19,722pcm |
| June 2018 | 0.8% | £19,331pcm |
| June 2017 | -0.8% | £19,171pcm |
| June 2016 | -3.6% | £19,320pcm |
| June 2015 | -2% | £20,048pcm |
| June 2014 | 0.7% | £20,457pcm |
| June 2013 | -0.6% | £20,310pcm |
| June 2012 | 4.5% | £20,436pcm |
| June 2011 | 13% | £19,563pcm |
| June 2010 | 10% | £17,317pcm |
| June 2009 | -10.6% | £15,749pcm |
| June 2008 | 11.1% | £17,608pcm |
| June 2007 | 0% | £15,845pcm |
Sales History
The last sale was on 30th September 2025 for £2,550,000 and since then the market in the area has increased by 2.4%. The postcode has had a total of 3 sales since 1995.
SW1X 9HL has seen 3 sales in the last three years and 1 sale in the last twelve months.
- Sold Sep 2025£2,550,000 | 3 Bed FlatApartment 9, 1, William Street, London, SW1X 9HLApartment 9, 1, William Street, London, SW1X 9HL
- Sold Mar 2024£2,650,000 | 3 Bed FlatApartment 7, 1, William Street, London, SW1X 9HLApartment 7, 1, William Street, London, SW1X 9HL
- Sold Sep 2023£15,200,000 | 3 Bed FlatApartment 4, 1, William Street, London, SW1X 9HLApartment 4, 1, William Street, London, SW1X 9HL
Nearby Postcodes
SW1X 9HL is the 827th largest and the 1790th most expensive postcode out of the 1,802 postcodes in the SW1X area.
- SW1X 8ET, Duplex Ride, London, SW1SW1X 8ET1 Addresses|28 m away
- SW1X 9HH, William Street, London, SW1SW1X 9HH9 Addresses|39 m away
- SW1X 8EL, Studio Place, London, SW1SW1X 8EL12 Addresses|42 m away
- SW1X 8EJ, Kinnerton Place North, London, SW1SW1X 8EJ10 Addresses|62 m away
- SW1X 8EW, Studio Place, London, SW1SW1X 8EW5 Addresses|65 m away
Property Types
- 1 period flat built between 1800 and 1911
- 9 modern flats built after 1980
- 2 other addresses of unknown type
- period flat (1)
- modern flat (9)
- Unknown (2)
Energy Efficiency
- Energy Performance Certificate (EPC) surveys conducted for 9 properties.
- The most common rating is D.
- A (0)
- E (0)
- B (0)
- F (0)
- C (4)
- G (0)
- D (5)
- No EPC (3)
Top 3 Most Expensive Sales
- Sold Sep 2023£15,200,000 | 3 Bed FlatApartment 4, 1, William Street, London, SW1X 9HLApartment 4, 1, William Street, London, SW1X 9HL
- Sold Mar 2024£2,650,000 | 3 Bed FlatApartment 7, 1, William Street, London, SW1X 9HLApartment 7, 1, William Street, London, SW1X 9HL
- Sold Sep 2025£2,550,000 | 3 Bed FlatApartment 9, 1, William Street, London, SW1X 9HLApartment 9, 1, William Street, London, SW1X 9HL
Schools Nearby
- St George's Hanover Square CofE Primary School900 m away
- Holy Trinity CofE Primary School1.0 km away
- St Peter's Eaton Square CofE Primary School1.0 km away
- St. Thomas More Language College1.0 km away
- Westminster City School1.4 km away
- The Grey Coat Hospital1.8 km away
More reading links
Public Transport Nearby
The closest station to SW1X 9HL is Knightsbridge station, which is 400 metres away.
- Knightsbridge|400 m away
- Hyde Park Corner|400 m away
- Sloane Square|1.1 km away
- Green Park|1.2 km away
