House Prices / London / Westminster / SW1 / William Street1, William Street - SW1X 9HL
Key Building Insights
1, William Street is a residential building situated on William Street, London, SW1 with 9 addresses.
It ranks as the 2209th largest and 2973rd most expensive of the 2,974 buildings in the SW1X area. The most common property type is a modern flat built after 1980.
The building contains a total of 9 properties: 9 flats.
Key Building Insights
1, William Street is a residential building situated on William Street, London, SW1 with 9 addresses.
It ranks as the 2209th largest and 2973rd most expensive of the 2,974 buildings in the SW1X area. The most common property type is a modern flat built after 1980.
The building contains a total of 9 properties: 9 flats.
Explore Propertieson William Street, London, SW1
- Apartment 2, 1 William Street
3 Bed Modern Flat
- Apartment 3, 1 William Street
3 Bed Modern Flat
- Apartment 4, 1 William Street
3 Bed Modern Flat
- Apartment 5, 1 William Street
3 Bed Modern Flat
Sales Market Trendsin 1, William Street
The last sale in 1, William Street 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 building is £12,048,928.
The 1, William Street Sales Market has decreased by 13.6% over the last 10 years.
| Period | Year on Year | Average Price |
|---|---|---|
| June 2026 | 0.1% | £12,048,928 |
| June 2025 | -2.7% | £12,041,372 |
| June 2024 | -3.2% | £12,376,120 |
| June 2023 | 1.4% | £12,786,481 |
| June 2022 | 3.4% | £12,611,509 |
| June 2021 | -4.5% | £12,197,476 |
| June 2020 | 2% | £12,770,190 |
| June 2019 | -3.6% | £12,519,099 |
| June 2018 | -4.5% | £12,980,730 |
| June 2017 | -2.6% | £13,594,890 |
| June 2016 | -3.3% | £13,950,792 |
| June 2015 | -0.3% | £14,420,704 |
| June 2014 | 12.6% | £14,462,504 |
| June 2013 | 10.9% | £12,840,339 |
| June 2012 | 16.1% | £11,579,116 |
| June 2011 | 11.6% | £9,974,175 |
| June 2010 | 12.6% | £8,939,905 |
| June 2009 | -6.4% | £7,940,024 |
| June 2008 | 15.1% | £8,486,231 |
| June 2007 | 0% | £7,372,846 |
Rental Market Trendsin 1, William Street
The current average rental value in the building is £34,401.
The 1, William Street Rental Market has increased by 40.2% over the last 10 years.
| Period | Year on Year | Average Price |
|---|---|---|
| June 2026 | 8.9% | £34,401pcm |
| June 2025 | 3.5% | £31,584pcm |
| June 2024 | -0.6% | £30,508pcm |
| June 2023 | 14.1% | £30,691pcm |
| June 2022 | 24.5% | £26,896pcm |
| June 2021 | -8.3% | £21,609pcm |
| June 2020 | -5.5% | £23,572pcm |
| June 2019 | 1.9% | £24,948pcm |
| June 2018 | 0.9% | £24,495pcm |
| June 2017 | -1.1% | £24,266pcm |
| June 2016 | -3.8% | £24,532pcm |
| June 2015 | -2% | £25,490pcm |
| June 2014 | 0.7% | £26,010pcm |
| June 2013 | -0.6% | £25,822pcm |
| June 2012 | 4.5% | £25,982pcm |
| June 2011 | 13% | £24,872pcm |
| June 2010 | 10% | £22,017pcm |
| June 2009 | -10.6% | £20,024pcm |
| June 2008 | 11.1% | £22,387pcm |
| June 2007 | 0% | £20,146pcm |
Sales Historyin 1, William Street, London, SW1
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 building has had a total of 3 sales since 1995.
1, William Street, London, SW1 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
Property Typesin 1, William Street
- 8 modern flats built after 1980
- 1 other address of unknown type
- modern flat (8)
- Unknown (1)
Energy Efficiencyof properties in 1 William Street
- Energy Performance Certificate (EPC) surveys conducted for 8 properties.
- The most common rating is D.
- A (0)
- E (0)
- B (0)
- F (0)
- C (3)
- G (0)
- D (5)
- No EPC (1)
Top 3 Most Expensive Saleson William Street, London, SW1
- 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 1, William Street, London, SW1 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
