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Flat 3, 23 Onslow Square, London, SW7 3NJ
This 64 square metre property in London carries an energy performance rating of C, which is above the national average. It is heated by a gas central heating system and is currently listed as social housing. It was sold for £2,800,000 in May 2023.
Property Type
2nd Floor Flat
Bedrooms
3
Floor Area
64 m²
Council Tax
Band G
Property Features
Built Before 1900
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Energy Performance
EPC rating and efficiency details
Current Certificate(1 of 4)
Sept 2024
EPC Rating
A
B
C
C75
D
E
F
G
Main Heating
Gas
Main Fuel
Gas
Hot Water
Good
Windows
Very Poor
CO2 Emissions
1.7 t/year
Tenure
Rented
Property Improvements
Changes detected from historical EPC data
Oct 2011from Oct 2008
Heating Controls
FullProg + TRVs
Heating controls changed
Hot Water
GoodAverage
Hot water efficiency decreased
Low Energy Lighting
0%100%
More low energy lighting installed
Sept 2014from Oct 2011
Heating Controls
Prog + TRVsProg + Stat
Heating controls upgraded for better temperature management
Hot Water
AverageGood
Hot water efficiency improved
Walls
Very PoorPoor
Wall insulation improved
Low Energy Lighting
100%33%
Low energy lighting percentage decreased
Sept 2024from Sept 2014
Heating Controls
Prog + StatFull
Heating controls upgraded for better temperature management
Low Energy Lighting
33%100%
More low energy lighting installed
Are we missing something? Tell us about home improvements to help adjust your valuation.
Price & History
Transactions and market trends
Estimated value
£1,492,000
How our AI predicts property prices · Accurate to within 10%
Automated estimate only. For an accurate valuation, consult a surveyor or estate agent.
Transaction history
+1.8%(6y)
£2,800,000Latest
May 2023£2,750,000
Aug 2017£2,850,000
Oct 2014£450,000
Dec 1997Source: HM Land Registry
Nearby in SW7 3NJ
Flat 2 23 Onslow Square London SW7 3NJ
Nov 2024
£2,825,000
Flat 12 25 Onslow Square Kensington And Chelsea London SW7 3NJ
Oct 2024
£560,000
Flat 11 25 Onslow Square Kensington And Chelsea London SW7 3NJ
Jul 2023
£1,600,000
Flat 1 17 Onslow Square London SW7 3NJ
Aug 2022
£3,600,000
Flat 1 11 Onslow Square London SW7 3NJ
Mar 2021
£2,300,000
Flat 1a 25 Onslow Square Kensington And Chelsea London SW7 3NJ
Oct 2020
£560,000
1 / 5
House Price Index
London-2.1%
97.1
Jan 26
UK HPI from HM Land Registry. Baseline: Jan 2015 = 100.
How This Property Compares on Onslow Square
See how this property stacks up against others nearby
Comparing to 39 other flats on this street
Price per m²
Property value per square metre of floor space
£43,750/£15,824 avg
LowerHigher
Higher than all similar properties
Years Held
Time since last sale — indicates ownership stability
3 years/14 years avg
ShorterLonger
Held longer than only 14% of similar properties
EPC Rating
Government energy efficiency score (1–100)
75 (C)/65 (D) avg
Less efficientMore efficient
More efficient than 87% of similar properties
Floor Area
Total internal floor space
64 m²/107 m² avg
SmallerLarger
Larger than only 10% of similar properties
CO₂ Emissions
Annual carbon output from heating, hot water & lighting
1.7 t/year/4.3 t/year avg
Higher emissionsLower emissions
Lower emissions than 97% of similar properties
Habitable Rooms
Living spaces like bedrooms & living rooms
4 rooms/4 rooms avg
FewerMore
More rooms than 67% of similar properties
Comparisons are based on the most recent EPC data for each property in this postcode. Only similar property types (flats) are compared.
Get alerts for SW7 3NJ
New sales, price changes, and market updates in this area
Places to visit
Road Noise
Average road noise levels for this postcode
Daytime
07:00 – 23:00
58.4dB
Moderate
Night-time
23:00 – 07:00
48.1dB
Low55 dB
60 dB
65 dB
70 dB
75 dB
80 dB
Defra Road Noise Strategic Mapping, Round 4Crime Analysis
12 months of data for London
Total Crimes
119
Monthly Avg
10
Recent Trend
Rising
Most Common
Theft from Person
Crime by Category
Theft from Person29(24%)
Other Theft25(21%)
Violence & Sexual22(18%)
Vehicle Crime16(13%)
Criminal Damage & Arson6(5%)
Bicycle Theft6(5%)
Robbery5(4%)
Burglary4(3%)
Public Order3(3%)
Drugs2(2%)
Other Crime1(1%)
Recent Incidents
Drugs
Nov 2025On or near Mcleod's Mews
Violence & Sexual
Nov 2025On or near Elvaston Place
Vehicle Crime
Nov 2025On or near Cheval Place
Criminal Damage & Arson
Nov 2025On or near Queen's Gate
Burglary
Nov 2025On or near Cheval Place
Violence & Sexual
Nov 2025On or near Cornwall Mews South
Data from Police UK • Updated monthly
Local Amenities
Schools and transport links nearby
Nearby Schools
58 within 3kmP
Oratory Roman Catholic Primary School
322m
4 mins
P
Marlborough Primary School
447m
5 mins
P
Our Lady of Victories RC Primary School
480m
6 mins
S
St. Thomas More Language College
716m
9 mins
S
Ada National College for Digital Skills
1.8km
21 mins
S
Chelsea Academy
1.8km
22 mins
Transport Links
30 within 3kmOnslow Square
Bus Stop67m
1 min
South Kensington Stn / Old Brompton Rd
Bus Stop100m
1 min
Pelham Street
Bus Stop108m
1 min
South Kensington Underground Station
Underground127m
2 mins
South Kensington Station
Tram164m
2 mins
Royal Brompton Hosp / Royal Marsden Hosp
Bus Stop265m
3 mins
School data from Dept. for Education • Transport data from NaPTAN
Nearby Property Businesses
Local professionals serving this area
Surveyor
Mason Drage
London
RICS
Surveyor
Imagine Property
London
RICS
Surveyor
Novello Chartered Surveyors
London
RICSResidential
Surveyor
RES Property Surveyors
Stoke
RICSResidential
Surveyor
Scott Davidson
London
RICSResidential
Surveyor
Silver
London
RICSResidential
Surveyor
Ondare
London
RICS
Surveyor
SRVO Property Limited
London
RICSResidential
Map
88 points of interest nearby
Map data from OpenStreetMap • Transport data from NaPTAN • School data from Dept. for Education • Scenic data from Beautifulplaces.ai
Frequently Asked Questions
Common questions about this property