Our Data Sources
Flat 89, 15, Portman Square has 51 entries in the Land Registry , most recently in December 2023 and a single entry in the EPC database dated August 2024.
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
In very good condition, we estimate Flat 89, 15, Portman Square would be worth £1,140,968, with a potential rental value of £4,986 per month.
If substantial cosmetic improvements are needed, the estimated sale value falls to £1,010,571, with a rental value of £4,416 per month.
The extent to which decoration affects a property's value depends on its type, size and location.
Energy Efficiency
Flat 89, 15, Portman Square has an Energy Performance Rating (EPC) of C. This is based on the most recent assessment, dated 22 Aug 2024.
The property is not connected to mains gas and has mostly secondary glazing. It is heated using Community scheme.
Sold Prices
Flat 89, 15, Portman Square last changed hands on 14th December 2023, selling for £1,340,000. The transaction was logged as a leasehold flat by HM Land Registry.
In total it has sold 5 times since 1995.
The market for similar properties has dropped by 19.6% since December 2023.
- Sold Dec 2023£1,340,000
- Sold Feb 2020£1,260,000
- Sold Aug 2014£1,350,000
Similar Properties Sold Nearby
Land Registry records and our Estate Agent network show 3 sales of comparable properties within 320 metres of Flat 89, 15, Portman Square across the last 2 years.
Most recently, Flat 96, 15, Portman Square, London, W1H 6LL, a leasehold flat, sold at £1,200,000 on the 1st November 2023.
Read more about house prices in W1.
- Sold Nov 2023£1,200,000 | 2 Bed FlatFlat 96, 15, Portman Square, London, W1H 6LLFlat 96, 15, Portman Square, London, W1H 6LL
- Sold Dec 2022£920,000 | 2 Bed FlatFlat 72, 15, Portman Square, London, W1H 6LLFlat 72, 15, Portman Square, London, W1H 6LL
- Sold Mar 2021£1,350,000 | 2 Bed FlatFlat 101, 15, Portman Square, London, W1H 6LLFlat 101, 15, Portman Square, London, W1H 6LL
•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 89, 15, Portman Square as the 217th largest and the 219th most expensive of the 269 addresses on Portman Square, London, W1.
Against the W1 postcode district average, it is £1.022m less expensive than the typical property.
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Schools Nearby
- 300mSt Vincent's Catholic Primary School
- 600mHampden Gurney CofE Primary School
- 700mSt Mary's Bryanston Square CofE School
- 700mThe St Marylebone CofE School
- 1.5kmMarylebone Boys' School
- 2.2kmMaria Fidelis Catholic School FCJ
More reading links
Public Transport Nearby
- 400mMarble Arch
- 500mBond Street
- 500mBond Street (Elizabeth line)
Available Internet Speeds
Ofcom's latest figures show poor internet coverage in this area, which may mean weak or no connectivity.
According to recent data from Ofcom, Slow/none broadband is available in the area.
Risk of Flooding
Environment Agency data suggests this area has a very low risk of flooding.












