Property profile

Flat 820 Onslow Square

Map showing Flat 8, 20 Onslow Square, London

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Estimated sale price

£1,790,000

Flats sold in Courtfield

The box shows the middle 50% of flats sale prices, the whiskers show the 5th to 95th percentile, and the marker shows this property's estimated price.

Half of similar homes sold within the box; most sold within the wider line.

An indicative model estimate, not a survey or formal valuation.

This property vs market

Last sold23 Dec 2025
£2,280,000Change since last sale: −£492,000 (−22%)
Annualised change
−31% per yearKensington and Chelsea annualised change (flats) since 2025: −9.7% per yearThis property's value fell faster than the market
Price per sq ftLocal median £1,225 per sq ft
£1,510 per sq ftEstimate vs local median: +£286 per sq ft (+23%)
Local sold pricesMedian for flats in Courtfield
£1,092,500Estimate vs local median: +£696,000 (+64%)
How this estimate is calculated

Area360's automated valuation uses available property details, recorded sales and local market data to estimate a sale price. This automated estimate is a guide, not a survey, mortgage valuation or formal valuation. See the valuation methodology and limitations.

Estimate calculated .

Property facts

Property typeFlat / Mid-Terrace
TenureLeasehold
Construction periodbefore 1900
Floor area110 m² / 1,184 sq ft
Rooms3 habitable / 3 heated
Floor level3
EPC ratingE
EPC inspection20 Dec 2022

Sales history

DatePriceChange
23 Dec 2025£2,280,000-

Local market

Property prices in Courtfield

Median price£1,125,000
Price per sq ft£1,310
Sales (last 12 months)87
Typical range (middle 50%)£800K – £2.0M

Based on 87 recent sales, the median property price is £1,125,000 (about £1,310 per square foot) in Courtfield area, with individual transactions ranging from £274,000 up to £12,700,000.

Prices by property typelast 12 months

Median sale price, median price per square foot, sales count, and percentile information for each property type in Courtfield over the last year.
TypeSalesMedian£/sq ft
Terraced11£3,200,000£1,794
Flats76£1,092,500£1,225

10-year price trendmedian sale price in Courtfield

Sale price

Ten year median sale price trend for each property type in Courtfield.
YearFlatsTerraced
2016£1,800,000£2,950,000
2017£1,150,000£2,887,500
2018£1,255,000£3,081,004
2019£1,150,000£3,455,000
2020£1,200,000£4,100,000
2021£1,270,000£2,567,500
2022£1,250,000£3,075,500
2023£1,250,000£2,718,425
2024£1,250,000£2,525,000
2025£1,000,000£3,075,000
2026£1,250,000£2,575,000
Ten year median sale price trend for each property type in Courtfield.

Price per sq ft

Ten year median sale price per square foot trend for each property type in Courtfield.
YearFlatsTerraced
2016£1,805£2,127
2017£1,463£1,707
2018£1,405£1,527
2019£1,328£1,700
2020£1,436£1,581
2021£1,452£1,757
2022£1,428£1,685
2023£1,465£1,640
2024£1,452£1,641
2025£1,267£1,661
2026£1,219£1,974
Ten year median sale price per square foot trend for each property type in Courtfield.

Price distribution by property typelast 12 months

Price distribution by property type for Courtfield in the last year.

Recent sales

There were 31 recent sold properties in the last 18 months near SW7 3NP.

Recent sold properties in the last 18 months near SW7 3NP
DateAddressTypeTenurePriceMap
23 Dec 2025Flat 8, 20, Onslow Square, London, SW7 3NPFlatsLeasehold£2,280,000
25 Jun 2025Flat 9, 14, Onslow Square, London, SW7 3NPFlatsLeasehold£2,200,000
31 Oct 202513, Sydney Mews, London, SW3 6HLFlatsLeasehold£1,500,000
29 May 20252, Sydney Close, London, SW3 6HNTerracedLeasehold£840,000
20 Nov 2025Flat 2, 11, Onslow Square, London, SW7 3NJFlatsLeasehold£2,750,000

Other properties at this postcode

AddressTenureFloor areaLast sale
2 Onslow Square, LondonLeasehold171 m²£3,700,000 (2024)
2A Onslow Square, LondonLeasehold80 m²£550,000 (2008)
4 Onslow Square, London, LondonLeasehold197 m²£4,100,000 (2024)
16, Onslow Square, London-225 m²-
Flat 1, 6, Onslow Square, London-108 m²-
Flat 1, 14, Onslow Square, LondonLeasehold118 m²£440,000 (1995)
Flat 3, 14, Onslow Square, LondonLeasehold142 m²£2,600,000 (2010)
Flat 3, 20 Onslow Square, LondonLeasehold61 m²£600,000 (2004)
Flat 4 &5, 20 Onslow Square, LondonLeasehold199 m²£6,200,000 (2017)
Flat 4, 6, Onslow Square, LondonLeasehold120 m²£2,950,000 (2013)

Area insights for SW7 3NP

Full area profile →

Overview

Postcode SW7 3NP is located in a major urban area, within the Courtfield ward of Kensington and Chelsea in the London region, and forms part of the South Kensington area. It has low deprivation and very high crime levels, with around 167.7 crimes per 1,000 residents per year, roughly 1.3× the London average of 130 per 1,000. The average income per household in South Kensington is £122,187 per year. The nearest station is South Kensington, about 0.1 miles away. There are 4 primary and 1 secondary schools in the area. There are 2 parks nearby, the closest small park is St Luke's Gardens.

Crime rate
10/10
Crimes per 1k residents
168
Deprivation level
4/10
Income level
10/10
Social housing
19.3%
Connectivity
10/10
Flood Risk
No risk
Noise Level
High

Deprivation level

4/10

South Kensington has a low level of deprivation, ranked at position 23,218 out of 32,844 areas in the United Kingdom, placing it within the bottom 29% least deprived areas in England.

Crime level

10/10

South Kensington has a very high crime rate, with approximately 167.7 reported incidents per 1,000 population each year.

Social housing

19.3%

Approximately 19.3% of homes on this street are social housing provided by a local council or housing association. Across the surrounding area, around 8.0% of dwellings are socially rented.

Income level

10/10

The average income per household in South Kensington is £122,187 per year.

Noise Level

High

High noise level (70.0-74.9 dB) from road, approximately 160 ft away from SW7 3NP.

Flood risk

No risk

South Kensington near SW7 3NP has no flood risk (less than 0.1% chance of a flood each year) from rivers and sea.

Transport

10/10

The nearest station is South Kensington located about 0.1 miles away. There are 5 stations nearby.

Nearby public transport stations for SW7 3NP
DistanceZoneNameLinesDirections
0.1 mi

1

South Kensington

Circle, District, Piccadilly

Walking directions to South Kensington
0.5 mi

1

Gloucester Road

Circle, District, Piccadilly

Walking directions to Gloucester Road
0.7 mi

1

Sloane Square

Circle, District

Walking directions to Sloane Square

Parks

Nearby parks and green spaces for SW7 3NP
DistanceNameSizeDirections
0.2 miSt Luke's GardensSmallWalking directions to St Luke's Gardens
0.3 miDovehouse GreenSmallWalking directions to Dovehouse Green

Area Profile

Population
181
Population density
5,370.9 per km²

Crime

Crime per 1,000 population

Anti-social behaviour
53.55(+99%)
Vehicle crime
43.04(+359%)
Violence and sexual offences
32.53(+5%)
Other theft
32.03(+180%)
Theft from the person
23.02(+145%)
London average

Demographics

Ethnic groups

British
102
56.98%
Other White
33
18.44%
Other Asian
8
4.47%
Other
8
4.47%
Arab
7
3.91%
Total population: 179

Economics

Education (age 16+)

Level 4+ (Degree)
101
65.58%
Level 3 (A level)
18
11.69%
Level 2 (GCSEs 9-4)
15
9.74%
No qualifications
11
7.14%
Level 1 (GCSEs 3-1)
6
3.9%
Total 16+ residents: 154

Housing

Housing tenure

Owns outright
29
34.94%
Private landlord or letting agency
25
30.12%
Other social rented
14
16.87%
Other forms of private rent
7
8.43%
Owns with a mortgage
6
7.23%
Total households: 83

Schools

In the SW7 3NP postcode area, located within South Kensington, there are 4 primary and 1 secondary schools in close proximity.

Nearby primary and secondary schools for SW7 3NP
DistancePhaseNameTypeRating
0.1 miNot applicableInstitute of Cancer ResearchHigher education institutions

N/A

0.1 miPrimaryOratory Roman Catholic Primary SchoolVoluntary aided school

Outstanding

0.3 miNot applicableLycee Francais Charles de GaulleOther independent school

Inadequate

Local amenities

15 nearby supermarkets & convenience stores within mi of SW7 3NP

Nearby supermarkets & convenience stores for SW7 3NP
DistanceNameAddressDirections
0.1 miKensington Express11 Old Brompton Road, London, SW7 3HZWalking directions to Kensington Express
0.2 miTreatsSouth Kensington Station Arcade, Kensington and Chelsea, SW7 2NAWalking directions to Treats
0.2 miTesco Express50-52 Old Brompton Road, London, SW7 3DYWalking directions to Tesco Express
0.2 miLittle Waitrose103 Old Brompton Road, London, SW7 3LEWalking directions to Little Waitrose
0.3 miChelsea Green Food & WineCale Street, Kensington and Chelsea, SW3 3QUWalking directions to Chelsea Green Food & Wine