Flat 10, 81 Onslow Square, London, SW7 3LT is a leasehold flat built before 1900. The property offers approximately 1,539 square feet of living space and is situated on the 5th floor. In this location, apartments of similar size usually have five bedrooms.

The estimated current market value of the property is £2,321,232 , which equates to approximately £1,508 per square foot. It was last sold on 15 Aug 2025 for £2,500,000. Since then, the value has decreased by £178,768, representing a 7.2% decrease, or approximately 8.5% per year.

The current estimated value of £2,321,232 is:

  • 9.4% higher than the average property price on Onslow Square
  • 21.9% lower than the average in the SW7 3LT postcode area
  • and 186.8% higher than the average price for London as a whole

This property has had 2 EPC inspections with recorded tenure information. It was recorded once as rented and once as owner-occupied, indicating a change in how it was used over time.

At the most recent EPC inspection on 17 April 2023, the property was recorded as rented.

View sold house prices in SW7 3LT

Building approximate location

About Property

Type
Flat
Built
before 1900
Interior Size
1539 sq ft
Tenure
Leasehold
Floor level
5th floor
Price (estimate)
£2,321,232
Price Per sq ft (estimate)
£1,508
Bedroom Count (estimate)
5 bedrooms

EPC Summary

Flat 10, 81 Onslow Square, London, Kensington And Chelsea, Greater London, SW7 3LT has an Energy Performance Certificate (EPC) rating of E, based on the latest assessment carried out on 17 Apr 2023.

This property is heated by a shared community system (community scheme). Community heating means the heat is supplied from a central source serving multiple homes. A community heating scheme is used to provide hot water. The windows are single glazed.

The previous EPC assessment was conducted on 7 Apr 2011, when the property was rated C. The current rating of E reflects a decline in energy efficiency of 38.2%.

Since the previous assessment, several changes were observed:

  • The hot water system changed from from main system to community scheme, with no change in energy efficiency (good).
  • The roof construction or insulation changed from flat, insulated (assumed) to flat, no insulation (assumed), changing energy efficiency from good to very poor.
  • The wall construction or insulation changed from timber frame, as built, insulated (assumed) to solid brick, as built, no insulation (assumed), changing energy efficiency from good to very poor.
  • The lighting was changed from low energy lighting in 24% of fixed outlets to low energy lighting in 20% of fixed outlets, with no change in efficiency (poor).
Heating Type
Community scheme
Good
Hot Water
Community scheme
Good
Roof
Flat, no insulation (assumed)
Very Poor
Walls
Solid brick, as built, no insulation (assumed)
Very Poor
Windows
Single glazed
Very Poor
Lighting
Low energy lighting in 20% of fixed outlets
Poor

Compared to SW7 3LT

6 th / 16
Price Rank
22% lower than average
3 rd / 12
Size Rank
5% bigger than average
6 th / 12
Price Per Sq FT Rank
26% lower than average

Sale History

Today
£2,321,232
streetscan.co.uk estimate
-7 %
15 Aug 2025
£2,500,000
Leasehold
-4.8 %
18 Nov 2011
£2,625,000
Leasehold

Flood Risk for this Property

Flood risk from rivers and the sea
Very low flood risk
Flood risk from surface water
Low flood risk
Surface water flood hazard
Low

* Results are based on Environment Agency flood risk mapping for the property UPRN where available. They are indicative and should not be treated as a site-specific flood survey.

Flood risk from rivers and the sea

This property has very low flood risk from rivers and the sea.

River and sea flooding includes flooding caused by overflowing rivers, estuaries, tidal waters and coastal surges.

Flood risk from surface water

This property has low surface water flood risk.

Surface water flooding can happen when heavy rainfall overwhelms drains, roads, gardens or other hard surfaces.

Flood depth indicators

Rivers and Sea
  • 0.2m depth No mapped risk
  • 0.3m depth No mapped risk
  • 0.6m depth No mapped risk
  • 0.9m depth No mapped risk
  • 1.2m depth No mapped risk
Surface Water
  • 0.2m depth Low
  • 0.3m depth Low
  • 0.6m depth No mapped risk
  • 0.9m depth No mapped risk
  • 1.2m depth No mapped risk

Area Insights

Similar Properties Sold Nearby

rooms: 3
size: 1442 sq ft
sale price: £3,325,000
sale date: 29 Jun 2021
rooms: 5
size: 1356 sq ft
sale price: £3,950,000
sale date: 15 Dec 2014
rooms: 4
size: 1319 sq ft
sale price: £2,250,000
sale date: 7 Jan 2011
rooms: 4
size: 1378 sq ft
sale price: £1,100,000
sale date: 29 Apr 2004
rooms: 5
size: 1313 sq ft
sale price: £1,725,000
sale date: 2 Oct 2025

Data Sources

The property at Flat 10, 81 Onslow Square, London, SW7 3LT appears two times in HM Land Registry records, with the latest transaction recorded on 15 Aug 2025. It also has two Energy Performance Certificate (EPC) records, the earliest dating back to 17 Apr 2023. We use this information to estimate the property's characteristics, flood risk profile and current market value.

This website uses public sector information from:

These datasets are licensed under the Open Government Licence v3.0 .

StreetScan.co.uk is not affiliated with, endorsed by, or associated with HM Land Registry, DESNZ, MHCLG, Defra or the Environment Agency.


Disclaimer: StreetScan.co.uk makes all reasonable efforts to ensure that the information provided on this website is current and accurate. However, no warranties or representations are made regarding its completeness, accuracy, suitability or reliability. Property values, flood risk assessments and other derived information are estimates based on publicly available datasets and should not be relied upon as professional, legal, surveying, environmental, financial or insurance advice. StreetScan.co.uk expressly disclaims all liability for any loss, damage, cost or expense arising directly or indirectly from the use of, or reliance upon, information provided on this website.