Our Data Sources
Flat 4, 15, Portman Square has no records in the the Land Registry and a single entry in the EPC database dated April 2025.
We combine this information with public data 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 4, 15, Portman Square would be worth £522,870, with a potential rental value of £2,047 per month.
If substantial cosmetic improvements are needed, the estimated sale value falls to £463,114, with a rental value of £1,813 per month.
The extent to which decoration affects a property's value depends on its type, size and location.
Energy Efficiency
Flat 4, 15, Portman Square has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 24 Apr 2025.
The property is 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 12 sales of comparable properties within 320 metres of Flat 4, 15, Portman Square across the last 2 years.
Most recently, Flat 21, 40, Blandford Street, London, W1U 4ED, a leasehold flat, sold at £700,000 on the 28th March 2025.
Read more about house prices in W1.
- Sold Mar 2025£700,000 | 1 Bed FlatFlat 21, 40, Blandford Street, London, W1U 4EDFlat 21, 40, Blandford Street, London, W1U 4ED
- Sold Sep 2021£495,000 | 1 Bed FlatFlat 54, 21, Seymour Street, London, W1H 7JRFlat 54, 21, Seymour Street, London, W1H 7JR
- Sold Jul 2021£475,000 | 1 Bed FlatFlat 31, 21, Seymour Street, London, W1H 7JXFlat 31, 21, Seymour Street, London, W1H 7JX
•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 4, 15, Portman Square as the 265th largest and the 266th most expensive of the 269 addresses on Portman Square, London, W1.
Against the W1 postcode district average, it is £1.64m 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
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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.
