Property profile

Flat 521 Onslow Gardens

Map showing Flat 5, 21 Onslow Gardens, London

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Estimated sale price

£3,395,000

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 sold13 Feb 2026
£3,700,000Change since last sale: −£303,000 (−8.2%)
Annualised change
−16% per yearKensington and Chelsea annualised change (flats) since 2026: −2.3% per yearThis property's value fell faster than the market
Price per sq ftLocal median £1,225 per sq ft
£2,023 per sq ftEstimate vs local median: +£798 per sq ft (+65%)
Local sold pricesMedian for flats in Courtfield
£1,092,500Estimate vs local median: +£2,305,000 (+211%)
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 typeMaisonette / Mid-Terrace
TenureLeasehold
Construction periodbefore 1900
Floor area156 m² / 1,679 sq ft
Rooms4 habitable / 4 heated
Floor level2
EPC ratingD
EPC inspection03 Apr 2019

Sales history

DatePriceChange
13 Feb 2026£3,700,000-

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 49 recent sold properties in the last 18 months near SW7 3AL.

Recent sold properties in the last 18 months near SW7 3AL
DateAddressTypeTenurePriceMap
13 Feb 2026Flat 5, 21, Onslow Gardens, London, SW7 3ALFlatsLeasehold£3,700,000
30 Jan 2026Flat 7, 90, Onslow Gardens, London, SW7 3BSFlatsLeasehold£1,650,000
21 Jul 202584A, Onslow Gardens, London, SW7 3BSFlatsLeasehold£5,000,000
28 Mar 2025Flat 3, 26, Onslow Gardens, London, SW7 3AGFlatsLeasehold£3,500,000
31 Jul 2025Flat 6, 66, Onslow Gardens, London, SW7 3QBFlatsLeasehold£1,125,000

Other properties at this postcode

AddressTenureFloor areaLast sale
23 Onslow Gardens, London-624 m²-
Flat 1, 18 Onslow Gardens, LondonLeasehold82 m²£1,750,000 (2016)
Flat 1, 19 Onslow Gardens, LondonLeasehold92 m²£679,000 (2007)
Flat 1, 24 Onslow Gardens, LondonLeasehold66 m²£1,100,000 (2022)
Flat 1/2, 21 Onslow Gardens, London-181 m²-
Flat 2, 18 Onlsow Gardens, LondonLeasehold117 m²£550,000 (1998)
Flat 2, 19 Onslow Gardens, LondonLeasehold120 m²£2,450,000 (2022)
Flat 2, 20 Onslow Gardens, LondonLeasehold120 m²£2,711,000 (2014)
Flat 2, 21 Onslow Gardens, London-174 m²-
Flat 2, 24 Onslow Gardens, LondonLeasehold80 m²£960,000 (2017)

Area insights for SW7 3AL

Full area profile →

Overview

Postcode SW7 3AL 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 0.3 miles away. There are 6 primary and no 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
20.5%
Connectivity
10/10
Flood Risk
No risk
Noise Level
Low

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

20.5%

Approximately 20.5% 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

Low

Low noise level (55.0-59.9 dB) from road, approximately 197 ft away from SW7 3AL.

Flood risk

No risk

South Kensington near SW7 3AL 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 0.3 miles away. There are 5 stations nearby.

Nearby public transport stations for SW7 3AL
DistanceZoneNameLinesDirections
0.3 mi

1

South Kensington

Circle, District, Piccadilly

Walking directions to South Kensington
0.4 mi

1

Gloucester Road

Circle, District, Piccadilly

Walking directions to Gloucester Road
0.7 mi

1,2

Earls Court

District, Piccadilly

Walking directions to Earls Court

Parks

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

Area Profile

Population
193
Population density
10,604.4 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

Other White
64
33.33%
British
56
29.17%
Chinese
19
9.9%
Indian
14
7.29%
Irish
13
6.77%
Total population: 192

Economics

Education (age 16+)

Level 4+ (Degree)
112
71.34%
Level 2 (GCSEs 9-4)
12
7.64%
Level 3 (A level)
12
7.64%
No qualifications
10
6.37%
Level 1 (GCSEs 3-1)
6
3.82%
Total 16+ residents: 157

Housing

Housing tenure

Private landlord or letting agency
25
32.05%
Owns outright
19
24.36%
Owns with a mortgage
18
23.08%
Other social rented
16
20.51%
Total households: 78

Schools

In the SW7 3AL postcode area, located within South Kensington, there are 6 primary and 0 secondary schools in close proximity.

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

N/A

0.2 miNot applicableFalkner HouseOther independent school

N/A

0.2 miPrimaryOur Lady of Victories RC Primary SchoolVoluntary aided school

Good

Local amenities

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

Nearby supermarkets & convenience stores for SW7 3AL
DistanceNameAddressDirections
0.1 miLittle Waitrose103 Old Brompton Road, London, SW7 3LEWalking directions to Little Waitrose
0.2 miTesco Express50-52 Old Brompton Road, London, SW7 3DYWalking directions to Tesco Express
0.2 miAP Food ExpressHarrington Road, Kensington and Chelsea, SW7 3NDWalking directions to AP Food Express
0.2 miKensington Express11 Old Brompton Road, London, SW7 3HZWalking directions to Kensington Express
0.3 miLondis156 Old Brompton Road, London, SW5 0BEWalking directions to Londis