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SW1P 3NB

Cowley Street, Westminster, London, SW1P

£16,950,000
Not valued
7 Beds
7 Baths
1029 m² Floor area
Type House
Listed 11 Sep 2026
Price per m² £18,950 / m²

It is hard to imagine a home as regal and unique as the Mansion House. Originally designed by Horace Field, its untold heritage and prestige are evident throughout. Meticulously renovated, this historic property will make a truly exceptional family home. 

The house is over 15m wide and has an array of illustrious period features such as the sweeping central staircase, the spacious oak-panelled drawing room, and the ornate gilt cupola. In addition to the intricate marble detailing and Royal Palace craftsmanship, the house also comes with a stunning private roof terrace that offers expansive views across Big Ben, the House of Lords, and Westminster Abbey.

Its bespoke leisure amenities include a spa with its own gym, sauna, steam room, jacuzzi, patio garden, and 10m swimming pool. There is also an 8-person lift, a walk-in wine room, a games room, a cinema, a bar, and a double kitchen with Miele and Gaggenau appliances. The house also has an integrated audio-visual and lighting system and comfort cooling. 

All seven bedrooms are en-suite and generously proportioned. The principal suite also comes with a walk-in dressing room, a private terrace, and two en-suite bathrooms.
Mansion House was reinstated as a private residence in 2017. It has undergone an extensive refurbishing process to honour its history and also integrate the latest amenities, creating the ideal haven for luxury living. 

It is located on Cowley Street in Westminster. Set in the heart of central London, it is surrounded by some of the country’s most significant landmarks, in addition to impressive retail, dining, and hospitality outlets.

How the asking price has moved

Sep 2026
£19,500,000
Listed at original asking price
Oct 2026
£16,950,000
Current asking price

Prices, costs and transport nearby

What homes within 400 m sold for since Nov 2023, by type. Source: HM Land Registry.

Type Median Middle 80%
Flat
Median
96 sales
Terraced
Median
1 sale
Semi-Detached
No sales nearby
Detached
No sales nearby

Most recent sales

Address Sold price Date Type
Flat 40, WESTMINSTER MANSIONS, GREAT SMITH STREET, SW1P 3BP £1,320,000 Jul 2026 Flat
Flat 509, ROMNEY HOUSE, 47 MARSHAM STREET, SW1P 3DS £890,000 Jun 2026 Flat
Flat 510, ROMNEY HOUSE, 47 MARSHAM STREET, SW1P 3DS £780,000 Apr 2026 Flat
Flat 5, 48, 48 TUFTON STREET, SW1P 3RA £805,000 Feb 2026 Flat
Flat 115, ROMNEY HOUSE, 47 MARSHAM STREET, SW1P 3DR £1,180,000 Jan 2026 Flat
Flat 414, ROMNEY HOUSE, 47 MARSHAM STREET, SW1P 3DS £725,000 Jan 2026 Flat
Flat 504, ROMNEY HOUSE, 47 MARSHAM STREET, SW1P 3DS £780,000 Nov 2025 Flat
Flat 116, ROMNEY HOUSE, 47 MARSHAM STREET, SW1P 3DR £800,000 Oct 2025 Flat
Flat 306, ROMNEY HOUSE, 47 MARSHAM STREET, SW1P 3DR £680,000 Oct 2025 Flat
Flat 42, WESTMINSTER MANSIONS, GREAT SMITH STREET, SW1P 3BP £472,000 Oct 2025 Flat
Flat 409, ROMNEY HOUSE, 47 MARSHAM STREET, SW1P 3DS £1,100,000 Oct 2025 Flat
Flat 426, ROMNEY HOUSE, 47 MARSHAM STREET, SW1P 3DS £715,000 Jul 2025 Flat
Flat 8, TUFTON COURT, TUFTON STREET, SW1P 3QH £625,750 Jun 2025 Flat
Flat 307, ROMNEY HOUSE, 47 MARSHAM STREET, SW1P 3DR £1,000,000 May 2025 Flat
Flat 201, ROMNEY HOUSE, 47 MARSHAM STREET, SW1P 3DR £887,000 May 2025 Flat
Source: HM Land Registry · within 200 m · most recent first

Cowley Street, Westminster, London, SW1P

We don't have enough nearby Land Registry sales matched to EPC floor-area data for this postcode and property type to calculate a fair price estimate. All other details are still available.

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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 1029 m². Updated daily.

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