Our Data Sources
Flat 77, 15, Portman Square has no records in the the Land Registry and a single entry in the EPC database dated February 2020.
We combine this information with public data 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 77, 15, Portman Square would be worth £769,377, with a potential rental value of £3,382 per month.
If substantial cosmetic improvements are needed, the estimated sale value falls to £681,449, with a rental value of £2,995 per month.
The extent to which decoration affects a property's value depends on its type, size and location.
Energy Efficiency
Flat 77, 15, Portman Square has an Energy Performance Rating (EPC) of C. This is based on the most recent assessment, dated 28 Feb 2020.
The property is not connected to mains gas and has single glazed windows. It is heated using Community scheme.
Similar Properties Sold Nearby
Land Registry records and our Estate Agent network show 23 sales of comparable properties within 320 metres of Flat 77, 15, Portman Square across the last 2 years.
Most recently, Flat 25, Wigmore Court 120, Wigmore Street, London, W1U 3RU, a leasehold flat, sold at £750,000 on the 3rd September 2025.
Read more about house prices in W1.
- Sold Sep 2025£750,000 | 2 Bed FlatFlat 25, Wigmore Court 120, Wigmore Street, London, W1U 3RUFlat 25, Wigmore Court 120, Wigmore Street, London, W1U 3RU
- Sold Sep 2024£750,000 | 2 Bed FlatFlat 6, Wigmore Court 120, Wigmore Street, London, W1U 3RUFlat 6, Wigmore Court 120, Wigmore Street, London, W1U 3RU
- Sold Jan 2024£790,000 | 2 Bed FlatFlat 21, 35, George Street, London, W1U 3QPFlat 21, 35, George Street, London, W1U 3QP
•Nearby is defined as the radius comprising the nearest 2,000 addresses.
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Location Comparison
Our analysis of the public data ranks Flat 77, 15, Portman Square as the 220th largest and the 261st most expensive of the 269 addresses on Portman Square, London, W1.
Against the W1 postcode district average, it is £1.405m 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 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.
