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£254,000 below fair value

W1H 6LL

Portman Square, Marylebone, London, W1H

2 Beds
2 Baths
63 m² Floor area
Type Flat
Listed 15 May 2026
Asking price £1,050,000
Price per m² £16,667 / m²

An opportunity to buy an unmodernised apartment in a sought-after mansion block | Sole Agent

Jaffray Estates are delighted to bring to market this opportunity to purchase a well-proportioned apartment situated in an attractive Art Deco block in Portman Square. The flat requires a full refurbishment, and once complete, would make an ideal central London pied-à-terre or buy-to-let investment.

Fifteen Portman Square is a sought-after block where residents have the benefits of 24-hour porters, passenger lifts, and access to the private garden square.

Portman Square is ideally placed for everything that Marylebone and Mayfair have to offer with world famous dining, shopping, theatres, high street, and the open spaces of Hyde Park just a short distance away.

The seller has agreed the premium for the lease extension, therefore selling this property with the benefit of a newly extended lease from The Portman Estate.

How the asking price has moved

May 2026
£1,050,000
Listed at original asking price

What similar homes actually sold for

Nearby Land Registry transactions — the data behind our fair price estimate.

Address Sold price Date Type
Flat 68, 15, 15 PORTMAN SQUARE, W1H 6LL £2,000,000 Jun 2024 Flat
Flat 89, 15, 15 PORTMAN SQUARE, W1H 6LL £1,340,000 Dec 2023 Flat
Flat 96, 15, 15 PORTMAN SQUARE, W1H 6LL £1,200,000 Nov 2023 Flat
Flat 67, 15, 15 PORTMAN SQUARE, W1H 6LL £1,700,000 Jul 2021 Flat
Flat 101, 15, 15 PORTMAN SQUARE, W1H 6LL £1,350,000 Mar 2021 Flat
Flat 97, 15, 15 PORTMAN SQUARE, W1H 6LL £750,000 Nov 2020 Flat
Flat 89, 15, 15 PORTMAN SQUARE, W1H 6LL £1,260,000 Feb 2020 Flat
Flat 100, 15, 15 PORTMAN SQUARE, W1H 6LL £1,430,000 Jan 2020 Flat
Flat 82, 15, 15 PORTMAN SQUARE, W1H 6LL £2,050,000 Jul 2019 Flat
Source: HM Land Registry · W1H 6LL · Sorted by date

Portman Square, Marylebone, London, W1H

Our fair price estimate
£1,304,000
Nearby sold prices per m² × UK HPI × 63 m² floor area (EPC-declared)
Asking price £1,050,000
Fair price £1,304,000
Difference ↓ £254,000 under
Price per m² £16,667 / m²
Contact landlord
About this valuation

Fair price calculated from HM Land Registry sold prices in the same postcode area, adjusted by the UK House Price Index, and multiplied by the EPC-declared floor area of 63 m². Updated daily.