6 Sidmouth Avenue, Isleworth, TW7 4DW
About 6 Sidmouth Avenue
6 Sidmouth Avenue is a three-bedroom end-of-terrace house in Isleworth (TW7 4DW). It has a recorded floor area of 133 m² (around 1432 sq ft), construction records dating it to 1930-1949 and council tax band E. The latest certificate (December 2023) shows a D (score 63), on the cusp of jumping into the C band. The rating has held steady at D across 2 certificates since September 2009. Between certificates, wall efficiency went from Very Poor to Poor, window efficiency went from Poor to Average and lighting went from Good to Very Good; while roof efficiency dropped from Very Good to Very Poor. The recommended improvements would push it to C (score 78).
At 133 m² the property is well over the postcode median (81 m² across 25 EPCs), placing it in the larger end of the local stock. 7 planning records sit against the property, 5 approved, 2 refused. Past consents include an extension and a loft conversion, meaningful when judging how the property has evolved. Today's modelled estimate of £679,000 is 30.6% above the 2016 sale price. On a £-per-square-foot basis, the last sale (£363/sq ft) was about 18.3% below the postcode norm. Last sold in December 2016, so it's been off the market for around 9 years.
Know exactly what you're buying at 6 Sidmouth Avenue
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
- Bedrooms3
- Bathrooms2
- Dining roomYes
- CloakroomYes
Outside
- ParkingOff street
Energy performance
EPC Rating
Property Improvements
Changes detected from historical EPC data
Windows upgraded, improving insulation
Wall insulation improved
More low energy lighting installed
Planning history
6 Sidmouth Avenue has 3 separate extension applications on the council record.
- Feb 2025AmendmentIn report
Certificate of lawfulness for the existing use of the property as six self-contained flats.
Retrospective- Documents
- 11 docs on file
- Reference
- P/2024/2440
- Jun 2024OutlineIn report
Certificate of Lawfulness of the existing use as six self-contained flats (Use Class C3)
Retrospective- Documents
- 9 docs on file
- Reference
- P/2024/1136
We flagged 2 things worth checking at 6 Sidmouth Avenue
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
30-day money-back guarantee
Sales history & valuation
6 Sidmouth Avenue valuation sits well clear of the typical sold price in this postcode.
£679,000
Modelled from EPC, postcode comparables.
£520,000
Recorded with HM Land Registry.
Sales timeline
6 December 2016Most recent
£520,000
Median price across the last 5 sales in TW7 4DW: £575,000 (2024–2022).
Nearby sales in TW7 4DW
Everything we know about 6 Sidmouth Avenue, 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 Sidmouth Avenue homes
Floor Area for 6 Sidmouth Avenue runs comfortably ahead of the street norm.
Price per m²
£3,910
Street avg £6,008
Floor Area
133 m²
Street avg 95 m²
Habitable Rooms
6 rooms
Street avg 5 rooms
CO₂ Emissions
5.2 t/year
Street avg 4.6 t/year
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
0.2 km
West Thames College — bus stop.
Closest school
0.2 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
53.7dB
Night-time· 23:00 – 07:00
43.3dB