Our Data Sources
Flat 9, 15, Portman Square has 31 entries in the Land Registry , most recently in March 2010 and no records in the EPC database.
We combine this sold price information with public data of neighbouring properties to estimate the attributes and values.
The local information is scored as 4 out of 5 and is considered of high accuracy.
Price Range & Condition
In very good condition, we estimate Flat 9, 15, Portman Square would be worth £2,012,599, with a potential rental value of £6,982 per month.
If substantial cosmetic improvements are needed, the estimated sale value falls to £1,782,588, with a rental value of £6,184 per month.
The extent to which decoration affects a property's value depends on its type, size and location.
Sold Prices
Flat 9, 15, Portman Square last changed hands on 19th March 2010, selling for £420,000. The transaction was logged as a leasehold flat by HM Land Registry.
In total it has sold 3 times since 1995.
The market for similar properties has risen by 23.8% since March 2010.
- Sold Mar 2010£420,000
- Sold Oct 2006£270,000
- Sold Jul 2005£200,000
Similar Properties Sold Nearby
Land Registry records and our Estate Agent network show 56 sales of comparable properties within 320 metres of Flat 9, 15, Portman Square across the last 2 years.
Most recently, Flat 66, 15, Portman Square, London, W1H 6LJ, a leasehold flat, sold at £2,700,000 on the 7th October 2025.
Read more about house prices in W1.
- 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 Nov 2023£975,000 | 3 Bed FlatFlat 41, 15, Portman Square, London, W1H 6LJFlat 41, 15, Portman Square, London, W1H 6LJ
•Nearby is defined as the radius comprising the nearest 2,000 addresses.
More reading links
Location Comparison
Our analysis of the public data ranks Flat 9, 15, Portman Square as the 133rd largest and the 105th most expensive of the 269 addresses on Portman Square, London, W1.
Against the W1 postcode district average, it is £221k less expensive than the typical property.
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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
- Marble Arch|400 m away
- Bond Street|500 m away
- Bond Street (Elizabeth line)|500 m away
Available Internet Speeds
Ofcom's latest figures show ultrafast broadband available in this area.
According to recent data from Ofcom, Ultrafast Broadband is available in the area.
Risk of Flooding
Environment Agency data suggests this area has a Very Low risk of flooding.
