Our Data Sources
Flat 100, 15, Portman Square has a single entry in the Land Registry from January 2020 and a single entry in the EPC database dated February 2018.
We combine this information with that of neighbouring properties to estimate the property attributes and values.
The local information is scored as 3 out of 5 and is considered of medium accuracy.
Price Range & Condition
The condition of a property plays an important role in determining its value, with the degree of impact varying by property type, size and location.
For Flat 100, 15, Portman Square, we estimate a market value of £1,978,607 and a rental value of £8,015 per month when presented in very good decorative order. Should the property require extensive cosmetic improvement, those figures would reduce to £1,752,480 and £7,099 per month respectively.
Energy Efficiency
Flat 100, 15, Portman Square has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 26 Feb 2018.
The property is not connected to mains gas and has single glazed windows. It is heated using Community scheme.
Sold Prices
The most recent sale of Flat 100, 15, Portman Square completed on 20th January 2020 at £1,430,000 and was recorded by HM Land Registry as a leasehold flat.
Since 1995 this is the property's only sale.
Values of comparable properties have dropped by 10.4% over the period since January 2020.
- Sold Jan 2020£1,430,000
Similar Properties Sold Nearby
Over the past 2 years 49 properties similar to Flat 100, 15, Portman Square have sold within a radius of 320 metres, per the Land Registry and our network of Estate Agents.
The latest, on the 11th July 2025, was Flat 54, 15, Portman Square, London, W1H 6LJ, a leasehold flat which sold for £2,100,000.
Read more about house prices in W1.
- 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
- Sold Jan 2023£2,545,000 | 3 Bed FlatFlat 30, 15, Portman Square, London, W1H 6LJFlat 30, 15, Portman Square, London, W1H 6LJ
•Nearby is defined as the radius comprising the nearest 2,000 addresses.
More reading links
Location Comparison
Of the 269 addresses on Portman Square, London, W1, Flat 100, 15, Portman Square comes out as the 91st largest and the 107th most expensive in our analysis of the public data.
It is also £254k less expensive than the average property across the W1 district.
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
Internet coverage here is poor, based on recent Ofcom data, and connectivity may be weak or unavailable.
According to recent data from Ofcom, Slow/none Broadband is available in the area.
Risk of Flooding
The flood risk here is rated Very Low, based on Environment Agency data.
