Flat 1 46, Onslow Square, SW7 3NX

Flat 1 46 Onslow Square is a 101 m² / 1,087 sq ft flat in South Kensington. It sold for £2,550,000 in February 2016. Indexed forward to today's value, that sale is roughly £1,960k. Recent local prices imply a broad valuation context of £1,367k to £2,019k based on its internal area. The Land Registry and EPC data was last updated 1 June 2026.

Property data
Sale history
Date Paid price Annual growth After inflation
Feb 2016 £2,550,000 * 7.3% 5.1%
Mar 2007 £1,360,000 na na

*This price paid record has been flagged by Land Registry as a 'Category B: Additional Price Paid entry'. This could be due to a variety of reasons, such as the sale being a buy-to-let purchase, a repossession or a transfer to a limited company. When Land Registry suspects that a sale does not reflect full market value (e.g. part-ownership or right to buy), these transactions can be flagged as well. For this reason, we exclude them from our area statistics.

Internal area
101 square metres (1,087 square feet) according to latest EPC inspection
Price per internal area

This property sold for £25,247 per square metre (£2,346 per square foot) in Feb 2016. Indexed forward to today's value, this is roughly £19,402 per square metre (£1,803 per square foot) .

Date Paid price Paid £/sqm Today's value Today's value £/sqm
Feb 2016 £2,550,000 £25,248 £1,959,603 £19,402
Mar 2007 £1,360,000 £13,465 £2,037,853 £20,177

Calculated using the latest EPC internal area of 101 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 £1,959,603. 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 101 m², this implies a valuation between £1,367,000 and £2,019,000. 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
2
Type
Flat
Council tax band
G
Company ownership
Title number
BGL87507
Tenure
Leasehold/other
Title address
Flat 1, 46 Onslow Square, London
Owner
ROSEALEX LIMITED (Company reference number: 09894111)
Proprietor address: Flat 1, 46 Onslow Square, London SW7 3NX
Price paid on title: £2,550,000
Ownership record added to Land Registry's corporate ownership dataset 26 Feb 2016
Planning applications
Planning ref:
October 2016 PP/16/05248
Type:
Full and householder planning application
Status:
Application approved
Address:
Flat 1, 46 Onslow Square, LONDON,
Description:
Replacement of three multi-paned single-glazed timber sash windows with new single-glazed timber sashes featuring modified glazing pattern.
Planning ref:
September 2016 CON/16/05044
Type:
Discharge of conditions imposed on an existing application
Status:
Application approved with conditions
Address:
Flat 1, 46 Onslow Square, LONDON,
Description:
Details required by condition 3c (Submission of details-New windows) of listed building consent 16/01194 (Internal layout alterations at ground floor level and replacement of 3 windows)
Planning ref:
August 2016 PP/16/03389
Type:
Full and householder planning application
Status:
Application withdrawn before a decision was taken
Address:
Flat 1, 46 Onslow Square, LONDON,
Description:
Replacement of No 3 double glazed steel / aluminium windows with single glazed timber sash windows to rear lightwell elevation (Retrospective Application)
Planning ref:
July 2016 CON/16/03064
Type:
Discharge of conditions imposed on an existing application
Status:
Application approved with conditions
Address:
Flat 1, 46 Onslow Square, LONDON,
Description:
Details required by condition 3 (submission of details) of listed building consent LB/16/01194 (Internal layout alterations at ground floor level and replacement of 3 windows)
EPC Inspections
Summary:
09 June 2021 - energy performance certificate grade C
Certificate:
View energy certificate on GOV.UK
Reason for EPC:
Rental
Tenure:
Private rental
Property type:
2nd floor flat in an apartment block with 1 storeys , has 3 habitable rooms. Estimated year built before 1900
Area:
109 sqm (1,173 square foot) total internal area
Comments:
Walls: Solid brick, as built, no insulation (assumed). Roof: (another dwelling above). Heating: Community scheme.
Summary:
28 November 2011 - energy performance certificate grade D
Reason for EPC:
None
Tenure:
Owner-occupied
Property type:
None , has 3 habitable rooms. Estimated year built before 1900
Area:
101 sqm (1,087 square foot) total internal area
Comments:
Summary:
06 September 2011 - energy performance certificate grade E
Reason for EPC:
None
Tenure:
Owner-occupied
Property type:
None , has 3 habitable rooms. Estimated year built before 1900
Area:
99 sqm (1,066 square foot) total internal area
Comments:
Summary:
05 May 2009 - energy performance certificate grade D
Reason for EPC:
None
Tenure:
Owner-occupied
Property type:
None , has 3 habitable rooms. Estimated year built before 1900
Area:
109 sqm (1,173 square foot) total internal area
Comments:
Summary:
07 January 2009 - energy performance certificate grade D
Reason for EPC:
None
Tenure:
Private rental
Property type:
None , has 3 habitable rooms. Estimated year built before 1900
Area:
120 sqm (1,292 square foot) total internal area
Comments:
Frequently asked questions

Flat 1 46 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 £1,959,603.
  • Based on an internal area of 101 m² and recent prices in South Kensington, this implies a lower and upper quartile range from £1,367,000 to £2,019,000, using HouseMetric's implied valuation methodology.

According to HM Land Registry price paid data, Flat 1 46 Onslow Square last sold for £2,550,000 in February 2016.

HouseMetric shows Flat 1 46 Onslow Square as 101 m² (1,087 sq ft), based on the latest internal area data available for this property. The bedroom count is shown as 2 bedrooms. Bedroom numbers can come from a previous estate agency listing, an EPC record, or an estimate based on the size of the property.

The latest EPC rating shown by HouseMetric is C, from an inspection dated 09 June 2021. EPC information comes from the public Energy Performance Certificate data for England and Wales.

When we last checked, Flat 1 46 Onslow Square was in council tax band G. Council Tax bands can change, so check the latest Valuation Office Agency Council Tax list.

Flat 1 46 Onslow Square is in postcode SW7 3NX, in South Kensington. You can also view HouseMetric's sold-price page for Onslow Square, SW7 3NX 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.