15, Portman Square
Key Building Insights
15, Portman Square is a residential building situated on Portman Square, London, W1 with 115 addresses.
It ranks as the 2757th largest and 2119th most expensive of the 2,770 buildings in the W1H area. The most common property type is a early-century flat built between 1912 and 1935.
The building contains a total of 115 properties: 115 flats.
- Ave. Sale Price
- £1,693,136
- 10 Year change
- down 13.8%
- Ave. Rental Price
- £6,482pcm
- 10 Year change
- up 31.7%
- Ave. £ per ft²
- £1,562/ft²
- Ave. Gross Yield
- 4.6%/year/yr
Key Building Insights
15, Portman Square is a residential building situated on Portman Square, London, W1 with 115 addresses.
It ranks as the 2757th largest and 2119th most expensive of the 2,770 buildings in the W1H area. The most common property type is a early-century flat built between 1912 and 1935.
The building contains a total of 115 properties: 115 flats.
- Ave. Sale Price
- £1,693,136
- 10 Year change
- down 13.8%
- Ave. Rental Price
- £6,482pcm
- 10 Year change
- up 31.7%
- Ave. £ per ft²
- £1,562/ft²
- Ave. Gross Yield
- 4.6%/year/yr
Explore Propertieson Portman Square, London, W1
- Flat 1, 15 Portman Square
1 Bed Early-century Flat
- Flat 2, 15 Portman Square
1 Bed Early-century Flat
- Flat 3, 15 Portman Square
1 Bed Early-century Flat
- Flat 4, 15 Portman Square
1 Bed Early-century Flat
- Flat 5, 15 Portman Square
2 Bed Early-century Flat
Sales Market Trends
The last sale in 15, Portman Square sold for £2,700,000 on 7th October 2025. Since then prices are up an average of 0.5%.
The current average value in the building is £1,693,136.
The 15, Portman Square Sales Market has decreased by 13.8% over the last 10 years.
| Period | Year on Year | Average Price |
|---|---|---|
| June 2026 | -2.2% | £1,693,136 |
| June 2025 | -3.1% | £1,731,347 |
| June 2024 | 0.1% | £1,786,791 |
| June 2023 | -2.1% | £1,785,693 |
| June 2022 | 5.9% | £1,823,182 |
| June 2021 | -4.1% | £1,721,436 |
| June 2020 | 1.4% | £1,794,570 |
| June 2019 | -3.7% | £1,769,016 |
| June 2018 | -1% | £1,836,183 |
| June 2017 | -5.6% | £1,854,431 |
| June 2016 | -2.1% | £1,965,017 |
| June 2015 | 4.1% | £2,007,988 |
| June 2014 | 15.9% | £1,928,445 |
| June 2013 | 13.5% | £1,664,050 |
| June 2012 | 15.5% | £1,466,393 |
| June 2011 | 10.1% | £1,269,681 |
| June 2010 | 14.3% | £1,153,629 |
| June 2009 | -7.7% | £1,009,317 |
| June 2008 | 22% | £1,093,295 |
| June 2007 | 0% | £896,153 |
Rental Market Trends
The current average rental value in the building is £6,482.
The 15, Portman Square Rental Market has increased by 31.7% over the last 10 years.
| Period | Year on Year | Average Price |
|---|---|---|
| June 2026 | 3.9% | £6,482pcm |
| June 2025 | 2.1% | £6,237pcm |
| June 2024 | 4.6% | £6,108pcm |
| June 2023 | 8.9% | £5,840pcm |
| June 2022 | 22.5% | £5,363pcm |
| June 2021 | -8% | £4,380pcm |
| June 2020 | -3.9% | £4,758pcm |
| June 2019 | 1.6% | £4,950pcm |
| June 2018 | 3.7% | £4,870pcm |
| June 2017 | -4.6% | £4,695pcm |
| June 2016 | -0.3% | £4,921pcm |
| June 2015 | -1.5% | £4,937pcm |
| June 2014 | 2.1% | £5,014pcm |
| June 2013 | -3.5% | £4,913pcm |
| June 2012 | 4.4% | £5,090pcm |
| June 2011 | 14.6% | £4,877pcm |
| June 2010 | 14.3% | £4,255pcm |
| June 2009 | -9.7% | £3,721pcm |
| June 2008 | -0.1% | £4,120pcm |
| June 2007 | 0% | £4,125pcm |
Sales History
The last sale was on 7th October 2025 for £2,700,000 and since then the market in the area has increased by 0.5%. The building has had a total of 190 sales since 1995.
15, Portman Square, London, W1 has seen 11 sales in the last three years and 1 sale in the last twelve months.
- Sold Oct 2025£2,700,000 | 3 Bed FlatFlat 66, 15, Portman Square, London, W1H 6LJFlat 66, 15, Portman Square, London, W1H 6LJ
- Sold Jul 2025£2,100,000 | 3 Bed FlatFlat 54, 15, Portman Square, London, W1H 6LJFlat 54, 15, Portman Square, London, W1H 6LJ
- Sold Feb 2025£25,000 | 1 Bed FlatFlat 1, 15, Portman Square, London, W1H 6LJFlat 1, 15, Portman Square, London, W1H 6LJ
- Sold Jun 2024£2,000,000 | 3 Bed FlatFlat 68, 15, Portman Square, London, W1H 6LLFlat 68, 15, Portman Square, London, W1H 6LL
- Sold Dec 2023£1,340,000 | 2 Bed FlatFlat 89, 15, Portman Square, London, W1H 6LLFlat 89, 15, Portman Square, London, W1H 6LL
Property Types
- 9 flats of an unknown age
- 77 early-century flats built between 1912 and 1935
- 29 other addresses of unknown type
- flat (9)
- early-century flat (77)
- Unknown (29)
Energy Efficiency
- Energy Performance Certificate (EPC) surveys conducted for 77 properties.
- The most common rating is C.
- A (0)
- E (5)
- B (1)
- F (0)
- C (42)
- G (0)
- D (29)
- No EPC (38)
Top 3 Most Expensive Sales
- Sold Oct 2017£12,000,000 | 4 Bed FlatFlat 20, Orchard Court, Portman Square, London, W1H 6LEFlat 20, Orchard Court, Portman Square, London, W1H 6LE
- Sold Nov 2022£10,000,000 | 4 Bed FlatFlat 23, Orchard Court, Portman Square, London, W1H 6LEFlat 23, Orchard Court, Portman Square, London, W1H 6LE
- Sold Nov 2019£8,812,500 | 4 Bed FlatFlat 50, Orchard Court, Portman Square, London, W1H 6LGFlat 50, Orchard Court, Portman Square, London, W1H 6LG
Schools Nearby
- St Vincent's Catholic Primary School300 m away
- Hampden Gurney CofE Primary School600 m away
- St Mary's Bryanston Square CofE School700 m away
- The St Marylebone CofE School700 m away
- Marylebone Boys' School1.5 km away
- Maria Fidelis Catholic School FCJ2.2 km away
More reading links
Public Transport Nearby
The closest station to 15, Portman Square, London, W1 is Marble Arch station, which is 400 metres away.
- Marble Arch|400 m away
- Bond Street|500 m away
- Bond Street (Elizabeth line)|500 m away
- Baker Street|700 m away
