Our Data Sources
Flat 35, 15, Portman Square has a single entry in the Land Registry from February 2018 and a single entry in the EPC database dated October 2015.
We combine this information with that of neighbouring properties to estimate the property 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 35, 15, Portman Square would be worth £2,285,313, with a potential rental value of £8,155 per month.
If substantial cosmetic improvements are needed, the estimated sale value falls to £2,024,134, with a rental value of £7,223 per month.
The extent to which decoration affects a property's value depends on its type, size and location.
Energy Efficiency
Flat 35, 15, Portman Square has an Energy Performance Rating (EPC) of C. This is based on the most recent assessment, dated 22 Oct 2015.
The property is not connected to mains gas and has partial secondary glazing. It is heated using Community scheme.
Sold Prices
Flat 35, 15, Portman Square last changed hands on 1st February 2018, selling for £2,252,056. The transaction was logged as a leasehold flat by HM Land Registry.
That is its only recorded sale since 1995.
The market for similar properties has dropped by 14.4% since February 2018.
- Sold Feb 2018£2,252,056
Similar Properties Sold Nearby
Land Registry records and our Estate Agent network show 54 sales of comparable properties within 320 metres of Flat 35, 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 Jul 2022£2,150,000 | 3 Bed FlatFlat 29, 15, Portman Square, London, W1H 6LJFlat 29, 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 35, 15, Portman Square as the 103rd largest and the 86th most expensive of the 269 addresses on Portman Square, London, W1.
Against the W1 postcode district average, it is £38k more expensive than the typical property.
More reading links
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.
