1 Herm Close, Isleworth, TW7 4RH
About 1 Herm Close
1 Herm Close is a five-bedroom detached house in Isleworth (TW7 4RH). It has a recorded floor area of 207 m² (around 2228 sq ft), construction records dating it to 1991-1995 and council tax band H. The latest certificate (August 2024) shows a D (score 68), on the cusp of jumping into the C band. Earlier certificates rated it B (April 2024); the latest reading is 2 bands lower. Between certificates, hot-water efficiency went from Average to Good; while wall efficiency dropped from Very Good to Good and roof efficiency dropped from Good to Average. The recommended improvements would push it to C (score 78).
Held since April 2003 — that's 23 years off the open market, well above the local norm. Across 1996–2003, sale prices on this property compounded at 12.1% per year. Today's modelled estimate of £1,459,000 sits 81.2% above the 2003 sale of £805,000. 7 planning records sit against the property, 2 approved, 5 refused. Past consents include a basement excavation, meaningful when judging how the property has evolved. 5 bedrooms is on the larger side for this postcode, where 3 is the typical count.
Know exactly what you're buying at 1 Herm Close
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
What this property has
Inside
- Bedrooms5
- Bathrooms2
- Open-plan layoutYes
- Dining roomYes
- Utility roomYes
- EnsuiteYes
- StudyYes
Outside
- Private gardenYes
- GarageDouble
Energy performance
1 Herm Close's carbon output runs well above what efficient homes in the postcode produce.
EPC Rating
Property Improvements
Changes detected from historical EPC data
Heating system changed
Connected to mains gas supply
Heating controls changed
Hot water efficiency improved
Low energy lighting percentage decreased
Planning history
A recent planning application at 1 Herm Close was refused — worth checking the council file.
- Jun 2025FullIn report
Formation of a vehicular access to the house.
- Documents
- 7 docs on file
- Reference
- P/2025/1274
- Nov 2024ConditionsIn report
Details of condition 11 (water consumption and calculations) submitted pursuant to planning permission 01661/1/P3 (P/2017/5286) dated 15/06/2018 for the erection of two storey house with basement.
- Documents
- 4 docs on file
- Reference
- P/2024/3386
We flagged 3 things worth checking at 1 Herm Close
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
Sale price has at least doubled since 1996.
£1,459,000
Modelled from EPC, postcode comparables and a sale-price growth of 12.1% per year over 7 years.
£805,000
Growth on file: 12.1% per year over 7 years.
Sales timeline
24 April 2003Most recent
£805,000
+126.8%over 7 years29 February 1996
£354,950
Median price across the last 5 sales in TW7 4RH: £700,000 (2021–2003).
Everything we know about 1 Herm Close, 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
Similar properties nearby
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
0.3 km
Osterley Underground Station — subway entrance.
Closest school
1.0 km
Heston Community School. 48 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
51.7dB
Night-time· 23:00 – 07:00
44.8dB