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Here are the top 10 outcodes (first part of the postcode), with the greatest percentage increase in average price over the past 12 months. This data is for all property types.

This table shows the top of 10 outcodes:

Rank Outcode Town Region Avg Price Past 6 Months Avg Price Last Year Percentage Change (%)
1 B19 nan Birmingham 587,928 318,098 84.83
2 BN1 Brighton Brighton and Hove 2,161,341 1,169,747 84.77
3 CB10 Saffron Walden Essex 1,776,704 966,902 83.75
4 BH21 Colehill Dorset 1,139,052 698,424 63.09
5 B2 nan Birmingham 971,007 637,928 52.21
6 CH1 Chester Cheshire West and Chester 474,718 312,983 51.68
7 CA24 Egremont Cumbria 99,000 66,800 48.20
8 E14 Poplar Greater London 922,842 633,978 45.56
9 EX32 Barnstaple Devon 440,772 304,334 44.83
10 CF37 Pontypridd Rhondda Cynon Taff 273,768 193,132 41.75

To get a complete spreadsheet download of all ~3000 outcodes you can follow this link:

Download the complete list