Flat 3 55, Onslow Square, SW7 3LR

Flat 3 55 Onslow Square is a 204 m² / 2,196 sq ft flat in South Kensington. It sold for £3,725,000 in July 2022. Indexed forward to today's value, that sale is roughly £2,884k. Recent local prices imply a broad valuation context of £2,760k to £4,078k based on its internal area. The Land Registry and EPC data was last updated 1 June 2026.

Property data
Sale history
£3,725,000 on Jul 2022

*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
204 square metres (2,196 square feet) according to latest EPC inspection
Price per internal area

This property sold for £18,259 per square metre (£1,696 per square foot) in Jul 2022. Indexed forward to today's value, this is roughly £14,135 per square metre (£1,313 per square foot) .

Date Paid price Paid £/sqm Today's value Today's value £/sqm
Jul 2022 £3,725,000 £18,260 £2,883,567 £14,135

Calculated using the latest EPC internal area of 204 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 £2,883,567. 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 204 m², this implies a valuation between £2,760,000 and £4,078,000. 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
3
Type
Flat
Council tax band
H
Company ownership
Title number
BGL177799
Tenure
Leasehold/other
Title address
Flat 3, 55 Onslow Square, London
Owner
ONSLOW SQUARE PROPERTY LIMITED (Company reference number: 13992678)
Proprietor address: 134 Buckingham Palace Road, London SW1W 9SA
Ownership record added to Land Registry's corporate ownership dataset 18 Jul 2023
Planning applications
Planning ref:
May 2025 NMA/25/02175
Type:
Amendments or alterations arising from an existing or previous application
Status:
Application approved
Address:
Flat 3, 55 Onslow Square and 57 Onslow Square, LONDON,
Description:
Non-material amendment to planning permission PP/24/06635 which was approved on 04.04.2025, however the decision notice associated with the application includes a reason for refusal rather than conditions
Planning ref:
April 2025 LB/25/02622
Type:
Heritage application - conservation issues and listed buildings
Status:
Decision has yet to be made
Address:
Flat 3, 55 Onslow Square and 57 Onslow Square, LONDON,
Description:
Part demolition to allow erection of orangery, lower ground rear extension, introduction of AC units and internal works.
Planning ref:
April 2025 PP/25/02621
Type:
Full and householder planning application
Status:
Decision has yet to be made
Address:
Flat 3, 55 Onslow Square and 57 Onslow Square, LONDON,
Description:
Part demolition to allow erection of orangery, lower ground rear extension, introduction of AC units and internal works.
Planning ref:
October 2024 LB/24/06636
Type:
Heritage application - conservation issues and listed buildings ; this application involves a large scale development
Status:
Decision has yet to be made
Address:
Flat 3, 55 Onslow Square and 57 Onslow Square, LONDON,
Description:
Part demolition to allow erection of orangery, lower ground rear extension and internal works
Planning ref:
October 2024 PP/24/06635
Type:
Full and householder planning application ; this application involves a large scale development
Status:
Decision has yet to be made
Address:
Flat 3, 55 Onslow Square and 57 Onslow Square, LONDON,
Description:
Part demolition to allow erection of orangery, lower ground rear extension and internal works
Planning ref:
June 2024 LB/24/01991
Type:
Heritage application - conservation issues and listed buildings
Status:
Application refused
Address:
Flat 3, 55 Onslow Square and 57 Onslow Square, LONDON,
Description:
Part demolition to allow erection of orangery, lower ground rear extension and internal works.
Planning ref:
June 2024 PP/24/01990
Type:
Full and householder planning application
Status:
Application refused
Address:
Flat 3, 55 Onslow Square and 57 Onslow Square, LONDON,
Description:
Part demolition to allow erection of orangery, lower ground rear extension and internal works.
Planning ref:
March 2023 ARB/23/01319
Type:
Tree and hedge works
Status:
Application approved
Address:
Flat 3, 55 Onslow Square, LONDON,
Description:
Prune 1 x Lime Tree in rear garden.
EPC Inspections
Summary:
22 March 2018 - energy performance certificate grade D
Certificate:
View energy certificate on GOV.UK
Reason for EPC:
marketed sale
Tenure:
Owner-occupied
Property type:
1st floor flat in an apartment block with 2 storeys , has 6 habitable rooms. Estimated year built before 1900
Area:
204 sqm (2,196 square foot) total internal area
Comments:
Walls: Solid brick, as built, no insulation (assumed). Roof: (another dwelling above). Heating: Community scheme.
Frequently asked questions

Flat 3 55 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 £2,883,567.
  • Based on an internal area of 204 m² and recent prices in South Kensington, this implies a lower and upper quartile range from £2,760,000 to £4,078,000, using HouseMetric's implied valuation methodology.

According to HM Land Registry price paid data, Flat 3 55 Onslow Square last sold for £3,725,000 in July 2022.

HouseMetric shows Flat 3 55 Onslow Square as 204 m² (2,196 sq ft), based on the latest internal area data available for this property. The bedroom count is shown as 3 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 D, from an inspection dated 22 March 2018. EPC information comes from the public Energy Performance Certificate data for England and Wales.

When we last checked, Flat 3 55 Onslow Square was in council tax band H. Council Tax bands can change, so check the latest Valuation Office Agency Council Tax list.

Flat 3 55 Onslow Square is in postcode SW7 3LR, in South Kensington. You can also view HouseMetric's sold-price page for Onslow Square, SW7 3LR 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.