New home

1/19

New home

1/19

£22,500,000

Guide Price

5 bed flat for sale 1 William Street, Knightsbridge, London, SW1X

5 beds 5 baths Penthouse

New home Leasehold

Added on 29/07/2026

About this property

A masterpiece of mansion apartment living, Knightsbridge Gate is a Grade II listed building with a retained, Edwardian façade, comprising 15 meticulously designed residences.

Description

Built in 1902, Knightsbridge Gate is a Grade II listed building originally designed by architect W.D. Caröe for the Church Commissioners. The building retains the original façade in the Edwardian style, which has been painstakingly restored to preserve the heritage and glamour associated with Knightsbridge. Where the North elevation has been restored, the South façade is entirely new, featuring stepped pergolas and terraces.

Property type: Penthouse
Bedrooms: 5
Bathrooms: 5
Floor area: 4,944 sq ft
Tenure: Leasehold
Council tax band: H
Postcode: SW1X 9HL
Listed: 29 Jul 2026

Key features

Fourth floor, 5 bedroom duplex apartment
Generous terrace and balcony of 419 and 123 sq ft respectively
Impressive ceiling heights
24-hour concierge and security
Grand reception with residents' lounge and outdoor terrace
Storage available by separate negotiation
Price includes furniture
EPC Rating = D

Floorplan

Price guide

This home

£4,551 / sq ft

Area average (sold)

£2,105 / sq ft

Price per area, sold homes nearby

£1,276 / sq ft

£4,551 / sq ft

£3,016 / sq ft

Lowest

This home

Highest

£4,551 per sq ft — above 9 in 10 recent sales in SW1X (£1,276–£3,016, 10th–90th percentile, 130 sales over 24 months).

Lowest and highest are the 10th and 90th percentiles of 130 homes sold in SW1X over the last 24 months. This home's figure uses its asking price. All sold £/sq ft in SW1X →

Location

1 William Street, Knightsbridge, London, SW1X, SW1X 9HL

Open map Street View

Sold prices in SW1X 9HL

HM Land Registry sales in SW1X 9HL. Floor areas from Energy Performance Certificates where matched.

Address	Type	Sold	Size	Size	£/sq ft	Price
Apartment 9, 1, William Street Flat / maisonette	Flat / maisonette	Jan 2026	969 sq ft £1,548/sq ft	969 sq ft	£1,548	£1,500,000
Apartment 6, 1, William Street Flat / maisonette	Flat / maisonette	Nov 2025	5,038 sq ft £4,615/sq ft	5,038 sq ft	£4,615	£23,250,000
Apartment 9, 1, William Street Flat / maisonette	Flat / maisonette	Sept 2025	969 sq ft £2,632/sq ft	969 sq ft	£2,632	£2,550,000
Apartment 7, 1, William Street Flat / maisonette	Flat / maisonette	Mar 2024	969 sq ft £2,735/sq ft	969 sq ft	£2,735	£2,650,000
Apartment 4, 1, William Street Flat / maisonette	Flat / maisonette	Sept 2023	3,541 sq ft £4,292/sq ft	3,541 sq ft	£4,292	£15,200,000