SM3 postcode district: Sutton and around

SM3 is a postcode district in England, with 379 postcodes in use in 2 sectors. It has postcodes in Sutton and Merton. It is split between 3 councils: Sutton (372 postcodes), Merton (4) and Epsom and Ewell (3). 3 of its 379 postcodes are in Surrey. ONS lists no county for the other 376.

Postcodes in use: 379
Sectors: 2
Councils: 3 councils
Places: 2 places

Source: Office for National Statistics (ONS) Postcode Directory, August 2026, loaded 20 October 2026. See all our data sources

Every postcode in SM3, and which are new since 2020

New since 2020: 3
In use before 2020: 376

Of the 379 postcodes in SM3 that ONS places, 3 are new since 2020 and 376 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. Names in italics are council wards: we hold no town or village names here.

The middle of its postcodes: latitude 51.3713, longitude -0.2162. Open this area on OpenStreetMap

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 3 newest postcodes

SM3 9BTMay 2022 SM3 8AUMarch 2022 SM3 9BPMay 2021

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.

SM3 9WW

What broadband can you get in SM3?

Ofcom reports on 371 of the 379 postcodes in SM3. At 285 of them every home and business can get gigabit broadband.

Postcodes where every home can get gigabit285 of 371

Postcodes where every home can get superfast365 of 371

Ofcom gives each postcode's share of homes and businesses, not how many there are, so these count postcodes. Each postcode page has its own figures. A provider's checker answers for one address.

Check one address on Ofcom's checker

Source: Ofcom, Connected Nations, Spring 2026, data for January 2026, Open Government Licence v3.0. How we use it

Is SM3 at risk of flooding?

17 of the 379 postcodes in SM3 have a home or business in an area at risk of flooding from rivers or the sea, the Environment Agency says. At those, it puts 95 homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 17 of 379 postcodes High: 63Medium: 32Low: 136

High: 3.3% or more a year (1 in 30). Medium: 1% to 3.3% a year. Low: 0.1% to 1% a year. Very low: under 0.1% a year (1 in 1,000). Each band is the chance of flooding in any one year.

Homes and businesses in an area at risk of flooding from rivers or the sea, as the Environment Agency counts them, added up over the postcodes. It is for the land, not each building, and leaves out surface water, groundwater and sewers. Each postcode page has its own figures and its flood warning areas.

Source: Environment Agency, Risk of Flooding from Rivers and Sea (postcodes in areas at risk), published 6 July 2026, Open Government Licence v3.0. How we use it

What do homes sell for in SM3?

Homes in SM3 sold for a typical £550,000 in the 12 months to August 2026, across 190 sales, no change on the 12 months before, HM Land Registry's figures show.

£550,000 typical price, the 12 months to August 2026

£550,000 12 months to August 2025

■ no change on the 12 months before

Detached 3 sales, too few to price
Semi-detached £610,000 72 sales
Terraced £544,950 83 sales
Flat or maisonette £325,000 32 sales

Each bar is that kind's typical price, against the most expensive kind here.

Standard sales of homes at market value. A typical price is the median, the middle sale. Sales take weeks to be registered, so the last month or two are incomplete. Each postcode page gives the figure for its own postcode sector.

Source: 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