TW3 4 postcode sector in the TW3 district
TW3 4 is a sector of the TW3 district: every postcode that starts TW3 4. It has 152 postcodes in use, 5 of them large-user postcodes. A large-user postcode is one Royal Mail gives to a single address that gets a lot of mail.
Not sure what a sector is? UK postcode format explained.
Every postcode in the TW3 4 sector, and which are new since 2020
- New since 2020: 19
- In use before 2020: 133
- Outline: where 5 or more new postcodes since 2020 lie together
Of the 152 postcodes in the TW3 4 sector that ONS places, 19 are new since 2020 and 133 were in use before 2020.
Each mark is a postcode's centre point as ONS gives it, not a building. Press one to see its postcode and open its page. New since 2020 means it came into use in January 2020 or later. A dashed outline shows where 5 or more lie within 150 metres of each other. It is not a boundary, and no boundary is drawn. Where marks overlap, the one first in the key is drawn; the counts include every postcode. Names in italics are council wards: we hold no town or village names here.
Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026, the centre point of each postcode; when each came into use: the same directory; roads, rivers and built-up areas: Contains OS data © Crown copyright and database right 2026. Drawn by us. Street map: Ordnance Survey, OS Open Zoomstack, Open Government Licence v3.0, drawn with MapLibre. How we use them
The 5 newest postcodes
Where the new postcodes lie together
- 19 new postcodes since 2020, outlined on the map. TW3 4GB, is the newest of them.
What do homes sell for in TW3 4?
Homes in TW3 4 sold for a typical £493,750 in the 12 months to August 2026, across 24 sales, down 1.2% on the 12 months before, HM Land Registry's figures show.
- Detached 3 sales, too few to price
- Semi-detached £562,500 6 sales
- Terraced £477,000 12 sales
- Flat or maisonette 3 sales, too few to price
Each bar is that kind's typical price, against the most expensive kind here.
Standard sales of homes at market value at the postcodes that start TW3 4. A typical price is the median, the middle sale, given from 5 sales or more.
How we work this out: house prices by postcodeSource: HM Land Registry Price Paid Data, files dated 28 September 2026. Contains HM Land Registry data © Crown copyright and database right 2021. This data is licensed under the Open Government Licence v3.0. How we use it
Postcodes in TW3 4
Pick a postcode to see its council and MP, broadband, flood risk, what homes sell for, council tax, the nearest schools and stations, and crime around it.
Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026. Postcodes that have ended are not listed. See all our data sources
Other sectors in TW3
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