Postcode district report · August 2026

CM21, East Hertfordshire

CM21 is the 7th Hapiest of East Hertfordshire's 8 postcode districts on the HPAI Swatch, which compares them with each other on prices, how the market is moving, energy efficiency and transport. CM21 also reaches into Epping Forest; these figures are for its homes in East Hertfordshire.

Homes sold
94
in the 12 months to August 2026
Median price
£462,500
-4.5% on the year before
Price per m²
£4,888
median, homes with an EPC
Flats
15%
of homes sold

CM21 on the HPAI Swatch

Each tile ranks CM21 against the other postcode districts of East Hertfordshire.

Price per m²£4,888/m² 6th of 8
Price change-4.5% 5th of 8
Sales a year94 a year 6th of 8
Sales change-18.2% 5th of 8
Energy efficiency68 EPC score 7th of 8
Carbon3.6 t CO₂ a home 8th of 8
Station nearby0.9 km 2nd of 8
Yellow the best in East Hertfordshire Green above average Blue below average Purple weakest in East Hertfordshire

Yellow is Hapi: the more yellow, the better CM21 compares with the rest of East Hertfordshire. These colours compare postcode districts within East Hertfordshire; East Hertfordshire's own Swatch compares it with areas across England and Wales.

East Hertfordshire's postcode districts, Hapiest first

#Postcode districtSwatchHomes soldMedian pricePrice change
1 SG14 262£455,000 +2.2%
2 SG12 384£450,000 +5.9%
3 CM23 476£417,500 -2.7%
4 SG13 207£425,000 -6.6%
5 SG9 115£450,000 +0.6%
6 SG11 75£444,500 -6.4%
7 CM21 94£462,500 -4.5%
8 SG2 33£495,000 -14.7%

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About these figures

Price per m²
Median price per square metre of homes sold in the last 12 months (homes with an EPC).
Price change
Median price in the last 12 months against the 12 months before.
Sales a year
Open-market sales in the last 12 months. More sales means a deeper, easier market.
Sales change
Sales in the 12 months to three months ago against the year before. The newest months are left out: Land Registry registers sales late.
Energy efficiency
Average EPC energy efficiency score of homes sold (higher is more efficient).
Carbon
Average carbon emissions of homes sold, tonnes a year. Lower is better.
Station nearby
Median distance from homes sold to the nearest railway station. Closer is better.

Open-market sales from HM Land Registry Price Paid Data in the 12 months to August 2026 (homes in East Hertfordshire only); price per m², energy and carbon from the homes sold that have an Energy Performance Certificate. Postcode districts with fewer than 20 sales a year in East Hertfordshire aren't ranked.