Flat 17 27, Onslow Square, SW7 3NH

Flat 17 27 Onslow Square is a 89 m² / 958 sq ft flat in South Kensington. It sold for £1,751,000 in January 2012. Indexed forward to today's value, that sale is roughly £1,795k. Recent local prices imply a broad valuation context of £1,193k to £1,779k based on its internal area. The Land Registry and EPC data was last updated 4 August 2026.

Property data
Sale history
Date Paid price Annual growth After inflation
Jan 2012 £1,751,000 3702.0% 3620.9%
Jun 2011 £203,360 -80.5% -81.2%
Aug 2010 £800,000 5.4% 3.2%
Jun 2001 £497,000 22.2% 20.4%
Apr 1999 £320,000 na na
Internal area
89 square metres (958 square feet) according to latest EPC inspection
Price per internal area

This property sold for £19,674 per square metre (£1,828 per square foot) in Jan 2012. Indexed forward to today's value, this is roughly £20,168 per square metre (£1,874 per square foot) .

Date Paid price Paid £/sqm Today's value Today's value £/sqm
Jan 2012 £1,751,000 £19,674 £1,794,935 £20,168
Jun 2011 £203,360 £2,285 £298,226 £3,351
Aug 2010 £800,000 £8,989 £1,189,115 £13,361
Jun 2001 £497,000 £5,584 £1,324,364 £14,880
Apr 1999 £320,000 £3,596 £1,269,457 £14,264

Calculated using the latest EPC internal area of 89 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 £1,794,935. 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 £13,410 and £19,990 per square metre (£1,245 and £1,857 per square foot). Based on an internal area of 89 m², this implies a valuation between £1,193,000 and £1,779,000. 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
Archived listings
History:
Archived sales listing for Flat 17 27 Onslow Square. Advertised on multiple portals. It was reduced on 05/10/2011. It last appeared Feb 2012.
Photos:

There are 13 archived estate agent listing photos for Flat 17 27 Onslow Square.

Photos for 27 Onslow Square
View photos
Advertiser remarks:
  • 2 bedrooms
EPC Inspections
Summary:
11 February 2010 - energy performance certificate grade C
Reason for EPC:
None
Tenure:
Owner-occupied
Property type:
None , has 4 habitable rooms. Estimated year built 1950 to 1966
Area:
89 sqm (958 square foot) total internal area
Comments:
Frequently asked questions

Flat 17 27 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 £1,794,935.
  • Based on an internal area of 89 m² and recent prices in South Kensington, this implies a lower and upper quartile range from £1,193,000 to £1,779,000, using HouseMetric's implied valuation methodology.

According to HM Land Registry price paid data, Flat 17 27 Onslow Square last sold for £1,751,000 in January 2012.

HouseMetric shows Flat 17 27 Onslow Square as 89 m² (958 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 11 February 2010. EPC information comes from the public Energy Performance Certificate data for England and Wales.

When we last checked, Flat 17 27 Onslow Square was in council tax band G. Council Tax bands can change, so check the latest Valuation Office Agency Council Tax list.

Flat 17 27 Onslow Square is in postcode SW7 3NH, in South Kensington. You can also view HouseMetric's sold-price page for Onslow Square, SW7 3NH 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 4 August 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.