Flat A, 23 St Johns Road, Isleworth, TW7 6NB
About Flat A
Flat A is a mid-terrace house in Isleworth (TW7 6NB). It has a recorded floor area of 24 m² (around 258 sq ft), construction records dating it to 1900-1929 and council tax band B. The latest certificate (December 2021) shows a D (score 55), a step below the typical UK home. When first surveyed in January 2011 the rating was F, the property has climbed 2 bands since. Between certificates, wall efficiency went from Very Poor to Poor and hot-water efficiency went from Very Poor to Average; while main heating dropped from Good to Very Poor. The recommended improvements would push it to C (score 75). Main heating runs on electricity.
Today's modelled estimate of £281,000 is 46% below the 2022 sale of £520,000, an unusual pattern given regional price growth and worth checking against the EPC condition. On a £-per-square-foot basis, the last sale (£2,013/sq ft) was about 430.6% above the typical sold price in the postcode. At 24 m² it sits well below the postcode median (46 m² across 21 EPCs), making it one of the more compact homes locally. 7 planning records sit against the property, 0 approved, 3 refused. Last sale on file: £520,000 in June 2022. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.
Know exactly what you're buying at Flat A
Before you offer, see what the listing won't tell you, the true value, the red flags and the full history.
Already flagged here
Valuation
against the asking price
Risks
planning & flood
Sold prices
similar homes nearby
Trends
the local market
Energy performance
EPC Rating
Property Improvements
Changes detected from historical EPC data
Hot water system upgraded
Low energy lighting percentage decreased
Heating controls upgraded for better temperature management
Heating system changed
Changed to a more efficient fuel source
Heating controls changed
Hot water system changed
Windows upgraded, improving insulation
Hot water system upgraded
Loft insulation installed or upgraded to 250mm+
More low energy lighting installed
Hot water efficiency decreased
Wall insulation improved
Planning history
A subdivision application was refused at Flat A in 2024.
- Sept 2024Loft ConversionFullIn report
The conversion of the existing 3 Bed Apartment into a 1B1P and a 1B1P Apartment, including the new attic dormer (Reduced in width as agreed with Planning Officer) and re-aligned front fa??ade
- Documents
- 23 docs on file
- Reference
- P/2024/3142
- Aug 2024SubdivisionFullIn report
Extension: Rear of property
Erection of a rear roof extension with three front roof windows and a part first floor front extension to re-align the front facade to convert the existing apartment to two apartments
Extension- Documents
- 15 docs on file
- Reference
- P/2024/2177
We flagged 3 things worth checking at Flat A
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
- A planning decision worth checking
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Sales history & valuation
Latest sale on Flat A was the highest on Land Registry record across the postcode.
£281,000
Modelled from EPC, postcode comparables.
£520,000
Recorded with HM Land Registry.
Sales timeline
21 June 2022Most recent
£520,000
Median price across the last 5 sales in TW7 6NB: £221,000 (2022–2007).
Nearby sales in TW7 6NB
25b, St Johns Road, Isleworth, TW7 6NB
Sold Jun 2022
£200,00025a, St Johns Road, Isleworth, TW7 6NB
Sold Jun 2022
£221,0001 Floriston Villas, St Johns Road, Isleworth, TW7 6NB
Sold Jan 2021
£1,00015a, St Johns Road, Isleworth, TW7 6NB
Sold Apr 2008
£240,00021a, St Johns Road, Isleworth, TW7 6NB
Sold Aug 2007
£398,000
Everything we know about Flat A, 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
- A planning decision worth checking

Versus other St Johns Road homes
On price per m², Flat A stands well clear of the street.
Price per m²
£21,667
Street avg £3,945
Floor Area
24 m²
Street avg 47 m²
Habitable Rooms
2 rooms
Street avg 3 rooms
CO₂ Emissions
1.7 t/year
Street avg 2.2 t/year
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The neighbourhood at a glance
Rail-style transport is unusually close for this postcode.
Crime
3/mo
Steady year-on-year across the wider district.
Nearest stop
0.1 km
Isleworth Station / Rennels Way — bus stop.
Closest school
0.3 km
West Thames College. 47 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
53.6dB

Night-time· 23:00 – 07:00
43.3dB