Flat 10 14, Onslow Square, SW7 3NP

Flat 10 14 Onslow Square is a 114 m² / 1,227 sq ft flat in South Kensington. It sold for £1,975,000 in July 2024. Indexed forward to today's value, that sale is roughly £1,618k. Recent local prices imply a broad valuation context of £1,542k to £2,279k 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
Jul 2024 £1,975,000 58.0% 49.1%
Sep 2021 £525,000 * -3.5% -5.5%
Feb 2007 £875,000 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
114 square metres (1,227 square feet) according to latest EPC inspection
Price per internal area

This property sold for £17,324 per square metre (£1,609 per square foot) in Jul 2024. Indexed forward to today's value, this is roughly £14,196 per square metre (£1,319 per square foot) .

Date Paid price Paid £/sqm Today's value Today's value £/sqm
Jul 2024 £1,975,000 £17,325 £1,618,336 £14,196
Sep 2021 £525,000 £4,605 £524,472 £4,601
Feb 2007 £875,000 £7,675 £1,311,118 £11,501

Calculated using the latest EPC internal area of 114 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 £1,618,336. 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 114 m², this implies a valuation between £1,542,000 and £2,279,000. 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
Planning applications
Planning ref:
June 2017 LB/17/02919
Type:
Heritage application - conservation issues and listed buildings
Status:
Application approved
Address:
Flat 10, 14 Onslow Square, LONDON,
Description:
Internal alterations at 4th floor to improve and reconfigure layout (Listed Building Consent only)
Planning ref:
April 2017 LB/17/01540
Type:
Heritage application - conservation issues and listed buildings
Status:
Application approved
Address:
Flat 10, 14 Onslow Square, LONDON,
Description:
Replacement of front French doors with traditional timber windows
Planning ref:
April 2017 LB/17/01551
Type:
Heritage application - conservation issues and listed buildings
Status:
Application approved
Address:
Flat 10, 14 Onslow Square, LONDON,
Description:
Replacement of rear steel framed windows including re-instating a fourth to rear facade. Replacement of two hallway roof lights.
Planning ref:
April 2017 PP/17/01539
Type:
Full and householder planning application
Status:
Application approved
Address:
Flat 10, 14 Onslow Square, LONDON,
Description:
Replacement of front French doors with traditional timber windows
Planning ref:
April 2017 PP/17/01550
Type:
Full and householder planning application
Status:
Application approved
Address:
Flat 10, 14 Onslow Square, LONDON,
Description:
Replacement of rear steel framed windows including re-instating a fourth to rear facade. Replacement of two hallway roof lights.
EPC Inspections
Summary:
03 October 2019 - energy performance certificate grade E
Certificate:
View energy certificate on GOV.UK
Reason for EPC:
Rental
Tenure:
Private rental
Property type:
3rd floor flat on the top floor in an apartment block with 1 storeys , has 4 habitable rooms. Estimated year built before 1900
Area:
114 sqm (1,227 square foot) total internal area
Comments:
Walls: Timber frame, as built, no insulation (assumed). Roof: Flat, no insulation (assumed). Heating: Boiler and radiators, mains gas.
Summary:
09 September 2009 - energy performance certificate grade E
Reason for EPC:
None
Tenure:
Private rental
Property type:
None , has 3 habitable rooms. Estimated year built before 1900
Area:
97 sqm (1,044 square foot) total internal area
Comments:
Summary:
21 October 2008 - energy performance certificate grade E
Reason for EPC:
None
Tenure:
Private rental
Property type:
None , has 3 habitable rooms. Estimated year built 1930 to 1949
Area:
108 sqm (1,163 square foot) total internal area
Comments:
Frequently asked questions

Flat 10 14 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 £1,618,336.
  • Based on an internal area of 114 m² and recent prices in South Kensington, this implies a lower and upper quartile range from £1,542,000 to £2,279,000, using HouseMetric's implied valuation methodology.

According to HM Land Registry price paid data, Flat 10 14 Onslow Square last sold for £1,975,000 in July 2024.

HouseMetric shows Flat 10 14 Onslow Square as 114 m² (1,227 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 E, from an inspection dated 03 October 2019. EPC information comes from the public Energy Performance Certificate data for England and Wales.

When we last checked, Flat 10 14 Onslow Square was in council tax band G. Council Tax bands can change, so check the latest Valuation Office Agency Council Tax list.

Flat 10 14 Onslow Square is in postcode SW7 3NP, in South Kensington. You can also view HouseMetric's sold-price page for Onslow Square, SW7 3NP 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.