Our Data Sources
Flat 1, 15, Portman Square has no recent1 records in the the Land Registry and a single entry in the EPC database dated June 2023.
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 1, 15, Portman Square would be worth £417,502, with a potential rental value of £1,637 per month.
If substantial cosmetic improvements are needed, the estimated sale value falls to £369,788, with a rental value of £1,450 per month.
The extent to which decoration affects a property's value depends on its type, size and location.
Energy Efficiency
Flat 1, 15, Portman Square has an Energy Performance Rating (EPC) of D. This is based on the most recent assessment, dated 22 Jun 2023.
The property is connected to mains gas and has single glazed windows. It is heated using Community scheme.
Sold Prices
Flat 1, 15, Portman Square last changed hands on 22nd March 2005, selling for £120,000. The transaction was logged as a leasehold flat by HM Land Registry.
That is its only recorded sale since 1995.
- Sold Mar 2005£120,000
Properties Sold Nearby
Land Registry records and our Estate Agent network show 525 sales within 320 metres of Flat 1, 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 Jun 2024£2,000,000 | 3 Bed FlatFlat 68, 15, Portman Square, London, W1H 6LLFlat 68, 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 1, 15, Portman Square as the 269th largest and the 269th most expensive of the 269 addresses on Portman Square, London, W1.
Against the W1 postcode district average, it is £1.741m less 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.
