Topaz Apartments, Flat 20, High Street, Hounslow, TW3 1AJ
About Topaz Apartments
Topaz Apartments is a semi-detached house in Hounslow (TW3 1AJ). It has a recorded floor area of 53 m² (around 570 sq ft), construction records dating it to 2012 onwards and council tax band C. At 53 m² this is the 24th smallest of 61 units on EPC record in Topaz Apartments, where floor areas span 47–86 m². The building's EPC ratings span C to B, with this unit at the bottom. The latest certificate (February 2025) shows a C (score 80), near the top of the C band. Earlier certificates rated it B (February 2015); the latest reading is one band lower. Between certificates, window efficiency dropped from Very Good to Good.
Today's modelled estimate of £248,000 sits 349.3% above the 2014 sale of £55,198. On a £-per-square-foot basis, the last sale (£97/sq ft) was about 76.8% below the postcode norm. It lags the bulk of the postcode on energy efficiency (less efficient than 83% of similar EPCs). On the market in February 2014 and unlisted since — roughly 12 years.
Know exactly what you're buying at Topaz Apartments
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
Topaz Apartments's carbon output is low for the local stock.
EPC Rating
Planning history
Topaz Apartments has no planning applications on record.
Notable planning nearby
23applications of note in the surrounding area
We flagged 2 things worth checking at Topaz Apartments
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
Topaz Apartments's modelled value sits at over four times its earliest registered sale price (2014).
£248,000
Modelled from EPC, postcode comparables.
£55,198
Recorded with HM Land Registry.
Sales timeline
14 February 2014Most recent
£55,198
Median price across the last 5 sales in TW3 1AJ: £285,000 (2025–2018).
Nearby sales in TW3 1AJ
Topaz Apartments, Flat 40, High Street, Hounslow, TW3 1AJ
Sold Jun 2025
£310,000Topaz Apartments, Flat 49, High Street, Hounslow, TW3 1AJ
Sold Jan 2020
£285,000Topaz Apartments, Flat 50, High Street, Hounslow, TW3 1AJ
Sold Oct 2019
£340,000Topaz Apartments, Flat 14, High Street, Hounslow, TW3 1AJ
Sold Jul 2018
£110,000Topaz Apartments, Flat 48, High Street, Hounslow, TW3 1AJ
Sold Jan 2018
£275,000
Everything we know about Topaz Apartments, 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
Price per m² for Topaz Apartments lags the street by a wide margin.
Price per m²
£1,041
Street avg £3,828
Floor Area
53 m²
Street avg 60 m²
Habitable Rooms
2 rooms
Street avg 3 rooms
CO₂ Emissions
1.1 t/year
Street avg 0.9 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
0.0 km
School Road (TW3) — bus stop.
Closest school
0.1 km
Hounslow Town Primary School. 52 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
52.6dB
Night-time· 23:00 – 07:00
42.2dB