Flat 6 5, Onslow Square, SW7 3NJ

Flat 6 5 Onslow Square is a 106 m² / 1,141 sq ft flat in South Kensington. It sold for £1,050,000 in December 2002. Indexed forward to today's value, that sale is roughly £2,286k. Recent local prices imply a broad valuation context of £1,434k to £2,119k based on its internal area. The Land Registry and EPC data was last updated 1 June 2026.

Property data
Sale history
£1,050,000 on Dec 2002
Floor plan

Archived estate agent floor plan for Flat 6 5, Onslow Square.

Floorplan 5
View floorplan
Internal area
106 square metres (1,141 square feet) according to latest EPC inspection
Price per internal area

This property sold for £9,905 per square metre (£920 per square foot) in Dec 2002. Indexed forward to today's value, this is roughly £21,568 per square metre (£2,004 per square foot) .

Date Paid price Paid £/sqm Today's value Today's value £/sqm
Dec 2002 £1,050,000 £9,906 £2,286,165 £21,568

Calculated using the latest EPC internal area of 106 m². Earlier sale dates may not have had the same measured area available.

Valuation
The most recent sale price indexed forward to today's value is £2,286,165. This is one data point to inform the valuation. Another method is the valuation implied by what comparable homes are selling for. Homes in South Kensington are now selling for between £13,530 and £19,990 per square metre (£1,256 and £1,857 per square foot). Based on an internal area of 106 m², this implies a valuation between £1,434,000 and £2,119,000. Treat this as context only. For a valuation using hand-picked comparable sales, use the Advanced search tool — create a shortlist of similar condition homes, then export a valuation report.
Bedrooms
na
Type
Flat
Council tax band
na
Company ownership
Title number
BGL21257
Tenure
Leasehold/other
Title address
Flat 6, 5 Onslow Square, London
Owner
SOCIETE CIVILE IMMOBILIERE LONDON HOUSE
Incorporated in MONACO
Proprietor address: Flat 6, 5 Onslow Square, London SW7 3NJ
Price paid on title: £1,050,000
Ownership record added to Land Registry's corporate ownership dataset 28 May 2010
Archived listings
History:
Archived rental listing for Flat 6 5 Onslow Square. Advertised on multiple portals. It was reduced on 06/02/2017. It last appeared Mar 2017.
Photos:

There are 3 archived estate agent listing photos (taken in November 2013) for Flat 6 5 Onslow Square.

Photos for 5 Onslow Square
View photos
Advertiser remarks:
  • 3 bedrooms
  • 3 bathrooms
EPC Inspections
Summary:
08 December 2021 - energy performance certificate grade D
Certificate:
View energy certificate on GOV.UK
Reason for EPC:
marketed sale
Tenure:
Owner-occupied
Property type:
3rd floor flat on the top floor in an apartment block with 2 storeys , has 3 habitable rooms. Estimated year built 1930 to 1949
Area:
106 sqm (1,141 square foot) total internal area
Comments:
Walls: Solid brick, as built, no insulation (assumed). Roof: Flat, no insulation (assumed). Heating: Boiler and radiators, mains gas.
Summary:
16 August 2016 - energy performance certificate grade E
Certificate:
View energy certificate on GOV.UK
Reason for EPC:
marketed sale
Tenure:
Owner-occupied
Property type:
Maisonette , has 5 habitable rooms. Estimated year built before 1900
Area:
171 sqm (1,841 square foot) total internal area
Comments:
Walls: Solid brick, as built, no insulation (assumed). Roof: Pitched, no insulation. Heating: Boiler and radiators, mains gas.
Summary:
06 January 2010 - energy performance certificate grade E
Reason for EPC:
None
Tenure:
Private rental
Property type:
None , has 5 habitable rooms. Estimated year built before 1900
Area:
172 sqm (1,851 square foot) total internal area
Comments:
Summary:
19 February 2009 - energy performance certificate grade E
Reason for EPC:
None
Tenure:
Private rental
Property type:
None , has 5 habitable rooms. Estimated year built before 1900
Area:
182 sqm (1,959 square foot) total internal area
Comments:
Frequently asked questions

Flat 6 5 Onslow Square is worth whatever price a willing buyer and seller agree upon. However, the following can provide useful context.

  • HouseMetric estimates the most recent sale price indexed forward to today's value is £2,286,165.
  • Based on an internal area of 106 m² and recent prices in South Kensington, this implies a lower and upper quartile range from £1,434,000 to £2,119,000, using HouseMetric's implied valuation methodology.

According to HM Land Registry price paid data, Flat 6 5 Onslow Square last sold for £1,050,000 in December 2002.

HouseMetric shows Flat 6 5 Onslow Square as 106 m² (1,141 sq ft), based on the latest internal area data available for this property.

The latest EPC rating shown by HouseMetric is D, from an inspection dated 08 December 2021. EPC information comes from the public Energy Performance Certificate data for England and Wales.

Flat 6 5 Onslow Square is in postcode SW7 3NJ, in South Kensington. You can also view HouseMetric's sold-price page for Onslow Square, SW7 3NJ or analysis of the South Kensington property market.

HouseMetric combines HM Land Registry price paid data, Energy Performance Certificate data and Ordnance Survey/open data. The data were last updated 1 June 2026. Figures such as indexed values and local valuation ranges are calculated estimates for context, while official records can change as public datasets are updated.

For more detail on HouseMetric data sources, update frequency and valuation methods, see the HouseMetric FAQs.