KT21 postcode district: Ashtead and around, Surrey

KT21 is a postcode district in Surrey, with 377 postcodes in use in 3 sectors. It has postcodes in Ashtead. Its council is Mole Valley.

Postcodes in use: 377
Sectors: 3
Council: Mole Valley
Places: Ashtead

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

Every postcode in KT21, and which are new since 2020

New since 2020: 3
In use before 2020: 374

Of the 377 postcodes in KT21 that ONS places, 3 are new since 2020 and 374 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.

The middle of its postcodes: latitude 51.3112, longitude -0.3036. 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

KT21 2ELMarch 2021 KT21 2EBMay 2020 KT21 9AXMay 2020

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.

KT21 1AG

What broadband can you get in KT21?

Ofcom reports on 367 of the 377 postcodes in KT21. At 250 of them every home and business can get gigabit broadband.

Postcodes where every home can get gigabit250 of 367

Postcodes where every home can get superfast354 of 367

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 KT21 at risk of flooding?

6 of the 377 postcodes in KT21 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 16 homes and businesses in an area at high or medium risk.

Homes and businesses in an area at risk, at 6 of 377 postcodes High: 12Medium: 4Low: 32Very low: 4

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 KT21?

Homes in KT21 sold for a typical £725,000 in the 12 months to August 2026, across 127 sales, down 0.7% on the 12 months before, HM Land Registry's figures show.

£725,000 typical price, the 12 months to August 2026

£730,000 12 months to August 2025

▼ down 0.7% on the 12 months before

Detached £900,000 53 sales
Semi-detached £665,000 45 sales
Terraced £635,000 9 sales
Flat or maisonette £345,750 20 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