CB21 4 postcode sector in the CB21 district
CB21 4 is a sector of the CB21 district: every postcode that starts CB21 4. It has 240 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 CB21 4 sector, by gigabit broadband
- No home or business can get gigabit: 103
- Some can get gigabit: 37
- Every home and business can get gigabit: 94
- Ofcom gives no figure: 6
- Outline: where 5 or more postcodes without gigabit lie together
Of the 240 postcodes in the CB21 4 sector that ONS places, 103 have no home or business that can get gigabit, 37 have some that can, 94 can all get it and 6 have no Ofcom figure.
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. A dashed outline shows where 5 or more lie within 200 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.
Sources: ONS Postcode Directory, August 2026, loaded 20 October 2026; Ofcom Connected Nations, Connected Nations, Spring 2026; roads, rivers and built-up areas: Ordnance Survey open maps. 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.
Postcodes without gigabit
103 postcodes here have no gigabit. These are the 12 first in postcode order.
Where the postcodes without gigabit lie together
- 24 postcodes without gigabit, outlined on the map. CB21 4DG, is the one nearest the middle of them.
- 16 postcodes without gigabit, outlined on the map. CB21 4SP, is the one nearest the middle of them.
- 11 postcodes without gigabit, outlined on the map. CB21 4PB, is the one nearest the middle of them.
- 10 postcodes without gigabit, outlined on the map. CB21 4QQ, is the one nearest the middle of them.
What do homes sell for in CB21 4?
Homes in CB21 4 sold for a typical £412,000 in the 12 months to September 2026, across 103 sales, HM Land Registry's figures show. The 12 months before gave £424,000 from 124 sales: not a change larger than chance would explain, given which homes happened to sell.
- Detached £560,000 47 sales
- Semi-detached £395,000 35 sales
- Terraced £338,000 19 sales
- Flat or maisonette 2 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 CB21 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 October 2026.
Postcodes in CB21 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: ONS Postcode Directory, August 2026, loaded 20 October 2026. Postcodes that have ended are not listed.
Other sectors in CB21
Check a postcode
Where the facts on this page come from
- Office for National Statistics: ONS Postcode Directory
- Ofcom Connected Nations
- HM Land Registry Price Paid Data
Contains public sector information licensed under the Open Government Licence v3.0. Contains HM Land Registry data © Crown copyright and database right 2021. This data is licensed under the Open Government Licence v3.0.
Licence: Open Government Licence v3.0.
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