20 Sidmouth Avenue, Isleworth, TW7 4DW
About 20 Sidmouth Avenue
20 Sidmouth Avenue is a four-bedroom mid-terrace house in Isleworth (TW7 4DW). It has a recorded floor area of 121 m² (around 1302 sq ft), construction records dating it to 1930-1949 and council tax band D. The latest certificate (November 2021) shows a D (score 58), a step below the typical UK home. The rating has held steady at D across 2 certificates since September 2015. Between certificates, wall efficiency dropped from Poor to Very Poor and lighting dropped from Very Good to Good. The recommended improvements would lift it to B (score 81), a 2-band jump.
At 121 m² the property is well over the postcode median (81 m² across 25 EPCs), placing it in the larger end of the local stock. 2 planning records sit against the property, 1 approved, 0 refused. Past consents include an extension, meaningful when judging how the property has evolved. Across 2015–2022, sale prices on this property compounded at 25% per year. Most recent transfer: May 2022 at £660,000. That sale was during the post-pandemic price surge, when transactions cleared materially above pre-2020 trend.
Know exactly what you're buying at 20 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
- Bedrooms4
- Bathrooms2
- Open-plan layoutYes
- Dining roomYes
- EnsuiteYes
Outside
- Private gardenYes
- ParkingAllocated
Building
- Heating systemGas
Energy performance
Recommended upgrades on file would lift this property by multiple EPC bands.
EPC Rating
Property Improvements
Changes detected from historical EPC data
Heating controls upgraded for better temperature management
Planning history
20 Sidmouth Avenue has 2 separate extension applications on the council record.
- Aug 2002ExtensionFullIn report
Extension: Single storey · Rear of property
Erection of a single storey rear extension to dwellinghouse.
- Reference
- P/2002/1858
- May 2002ExtensionOutlineIn report
Extension: Single storey · Rear of property
Certificate of Lawfulness for the erection of a single storey rear extension to dwellinghouse.
- Reference
- P/2002/1171
We flagged 2 things worth checking at 20 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
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Sales history & valuation
20 Sidmouth Avenue has more than quadrupled in price since its earliest registered sale in 2015.
£662,000
Modelled from EPC, postcode comparables and a sale-price growth of 25.0% per year over 7 years.
£660,000
Growth on file: 25.0% per year over 7 years.
Sales timeline
19 May 2022Most recent
£660,000
+337.1%over 6 years11 October 2015
£151,000
Median price across the last 5 sales in TW7 4DW: £575,000 (2024–2022).
Nearby sales in TW7 4DW
Everything we know about 20 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 20 Sidmouth Avenue runs comfortably ahead of the street norm.
Price per m²
£5,455
Street avg £5,935
Floor Area
121 m²
Street avg 95 m²
Habitable Rooms
6 rooms
Street avg 5 rooms
CO₂ Emissions
5.5 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