SM1 3 postcode sector in the SM1 district
SM1 3 is a sector of the SM1 district: every postcode that starts SM1 3. It has 216 postcodes in use, 2 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 SM1 3 sector, and which are new since 2020
- New since 2020: 2
- In use before 2020: 214
Of the 216 postcodes in the SM1 3 sector that ONS places, 2 are new since 2020 and 214 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. 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 2 newest postcodes
Further out, not drawn
This postcode lies well apart from the rest, so the map is drawn without it to show the rest closer; it is in every count.
What do homes sell for in SM1 3?
Homes in SM1 3 sold for a typical £482,500 in the 12 months to August 2026, across 122 sales, down 6% on the 12 months before, HM Land Registry's figures show.
- Detached £612,500 6 sales
- Semi-detached £550,000 51 sales
- Terraced £465,000 36 sales
- Flat or maisonette £265,000 29 sales
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 SM1 3. 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 SM1 3
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 SM1
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