257a, High Street, Hounslow, TW3 1EA
About 257a
257a is a mid-terrace house in Hounslow (TW3 1EA). It has a recorded floor area of 56 m² (around 603 sq ft), construction records dating it to 1900-1929 and council tax band C. The latest certificate (May 2023) shows a D (score 58), a step below the typical UK home. The rating has held steady at D across 3 certificates since January 2020. Between certificates, wall efficiency went from Poor to Very Good, roof efficiency went from Very Poor to Good and window efficiency went from Very Poor to Good; while hot-water efficiency dropped from Good to Poor and main heating dropped from Good to Very Poor. Main heating runs on electricity.
2 planning records sit against the property, 2 approved, 0 refused. Past consents include an extension and subdivision, meaningful when judging how the property has evolved. At 56 m² it's 19.1% larger than the typical home in the postcode (47 m² median across 3 EPCs).
Know exactly what you're buying at 257a
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
Changed to a more efficient fuel source
Hot water system upgraded
Single glazing replaced with double or better glazing
Wall insulation improved
Loft insulation installed or upgraded to 250mm+
Solar water heating installed
Solar PV added
Planning history
Council records show a subdivision application — the property's legal arrangement has been altered.
- Jun 2022ConditionsIn report
Details of conditions 4 (cycle parking), 5 (waste and recycling) and 10 (landscaping) submitted pursuant of planning permission 00610/257A/P1 dated 14/02/2022 for erection of a part first floor rear extension and conversion of existing flat into two flats with associated refuse storage and cycle parking.
- Documents
- 6 docs on file
- Reference
- P/2022/1224
- Feb 2022SubdivisionFullIn report
Extension: Rear of property
Erection of a part first floor rear extension and conversion of existing flat into two flats with associated refuse storage and cycle parking.
Extension- Documents
- 10 docs on file
- Reference
- P/2021/3933
We flagged 2 things worth checking at 257a
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
257a has no Land Registry sales on file, suggesting it has stayed in the same hands since registration began.
£264,000
Modelled from EPC, postcode comparables.
No sales recorded with HM Land Registry
That can mean the property has never traded since the registry began publishing in 1995, was a new build that hasn't been registered yet, or is held in the same hands long-term.
Median price across the last 5 sales in TW3 1EA: £800,000 (2023–2017).
Nearby sales in TW3 1EA
Everything we know about 257a, 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 High Street homes
EPC Rating
58 (D)
Street avg 66 (D)
Floor Area
56 m²
Street avg 59 m²
CO₂ Emissions
2.4 t/year
Street avg 2.5 t/year
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The neighbourhood at a glance
Rail-style transport is unusually close for this postcode.
Crime
16/mo
Rising year-on-year across the wider district.
Nearest stop
0.1 km
Treaty Centre — bus stop.
Closest school
0.5 km
Lift Kingsley. 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
55.5dB

Night-time· 23:00 – 07:00
45.8dB