19 Onslow Square, Kensington And Chelsea, London, SW7 3NJ
About 19 Onslow Square
19 Onslow Square is a mid-terrace house in Kensington And Chelsea, London, London (SW7 3NJ). It has a recorded floor area of 145 m² (around 1564 sq ft), construction records dating it to before 1900 and council tax band H. The latest certificate (February 2010) shows an F (score 37), near the bottom of the EPC scale. The recommended improvements would push it to E (score 45). The latest certificate is from February 2010, so improvements made since then won't be reflected.
Across 2003–2016, sale prices on this property compounded at 13.6% per year. Today's modelled estimate of £2,678,000 is 39.1% below the 2016 sale of £4,400,000, running counter to the wider postcode trend, which makes the EPC and condition history especially worth a look. On a £-per-square-foot basis, the last sale (£2,813/sq ft) was about 259.7% above the typical sold price in the postcode. At 145 m² the property is well over the postcode median (110 m² across 35 EPCs), placing it in the larger end of the local stock. On energy efficiency it sits in the bottom 10% of properties in this postcode — significant headroom for improvement. 15 planning records sit against the property, 15 approved, 0 refused. Past consents include tree works, new windows, a basement excavation and subdivision, meaningful when judging how the property has evolved. The record references listed-building consent, which constrain future alterations. 10 years since the last transfer (March 2016).
Know exactly what you're buying at 19 Onslow Square
Before you offer, see what the listing won't tell you, the true value, the red flags and the full history.
Already flagged here
Launch offer · save £5
Valuation
against the asking price
Risks
planning & flood
Sold prices
similar homes nearby
Trends
the local market
Energy performance
19 Onslow Square sits at the bottom of the postcode for energy efficiency — meaningful headroom to improve.
EPC Expired
This certificate is over 10 years old and is no longer valid.Expired 02 Feb 2020
EPC Rating
Planning history
Council records show a subdivision application — the property's legal arrangement has been altered.
- Nov 2024RenovationHeritageIn report
Installation of two fire rated doors in basement communal hallway.
- Council
- Thurloe and Smith's Charity
- Documents
- 13 docs on file
- Reference
- LB/24/06173
- Apr 2021Tree WorksTreesIn report
FELL 1 x Salix in rear communal gardens.
- Council
- Thurloe and Smith's Charity
- Documents
- 6 docs on file
- Reference
- ARB/21/01914
We flagged 2 things worth checking at 19 Onslow Square
Independent checks surfaced things a buyer would want to understand before offering. The report explains each one in full, with the underlying data and what to ask.
- Signs of HMO activity in the area
- Larger development activity nearby
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Sales history & valuation
Latest sale on 19 Onslow Square was the highest on Land Registry record across the postcode.
£2,678,000
Modelled from EPC, postcode comparables and a sale-price growth of 13.6% per year over 12 years.
£4,400,000
Growth on file: 13.6% per year over 12 years.
Sales timeline
24 March 2016Most recent
£4,400,000
+388.9%over 12 years27 October 2003
£900,000
Median price across the last 5 sales in SW7 3NJ: £2,800,000 (2024–2022).
Nearby sales in SW7 3NJ
Flat 2, 23 Onslow Square, London, SW7 3NJ
Sold Nov 2024
£2,825,000Flat 12, 25 Onslow Square, Kensington And Chelsea, London, SW7 3NJ
Sold Oct 2024
£560,000Flat 11, 25 Onslow Square, Kensington And Chelsea, London, SW7 3NJ
Sold Jul 2023
£1,600,000Flat 3, 23 Onslow Square, London, SW7 3NJ
Sold May 2023
£2,800,000Flat 1, 17 Onslow Square, London, SW7 3NJ
Sold Aug 2022
£3,600,000
Everything we know about 19 Onslow Square, in one report
What it's really worth, what could be wrong, and the planning, sales and area data in full.
What we flagged
- Signs of HMO activity in the area
- Larger development activity nearby

Versus other Onslow Square homes
19 Onslow Square is notably below the street on epc rating.
Price per m²
£30,276
Street avg £16,466
Floor Area
145 m²
Street avg 103 m²
Habitable Rooms
4 rooms
Street avg 4 rooms
CO₂ Emissions
11.1 t/year
Street avg 4.0 t/year
Similar properties nearby
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1 Selwood Place, Kensington And Chelsea
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1 Elm Place, Kensington And Chelsea
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1 Regency Terrace, Kensington And Chelsea
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1 Onslow Gardens, Kensington And Chelsea
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The neighbourhood at a glance
Rail-style transport is unusually close for this postcode.
Crime
10/mo
Rising year-on-year across the wider district.
Nearest stop
0.1 km
Onslow Square — bus stop.
Closest school
0.3 km
Oratory Roman Catholic Primary School. 58 schools nearby.
Go deeper on the local area
The full report breaks down crime, transport links, schools and air quality in depth.
Road noise across the postcode

Daytime· 07:00 – 23:00
58.4dB

Night-time· 23:00 – 07:00
48.1dB