Postcode district report · August 2026

CM1, Chelmsford

CM1 is the 5th Hapiest of Chelmsford's 6 postcode districts on the HPAI Swatch, which compares them with each other on prices, how the market is moving, energy efficiency and transport.

Homes sold
712
in the 12 months to August 2026
Median price
£389,000
-2.7% on the year before
Price per m²
£4,570
median, homes with an EPC
Flats
23%
of homes sold

CM1 on the HPAI Swatch

Each tile ranks CM1 against the other postcode districts of Chelmsford.

Price per m²£4,570/m² 5th of 6
Price change-2.7% 5th of 6
Sales a year712 a year 2nd of 6
Sales change-8.5% 4th of 6
Energy efficiency69 EPC score 3rd of 6
Carbon3.1 t CO₂ a home 2nd of 6
Station nearby1.9 km 2nd of 6
Yellow the best in Chelmsford Green above average Blue below average Purple weakest in Chelmsford

Yellow is Hapi: the more yellow, the better CM1 compares with the rest of Chelmsford. These colours compare postcode districts within Chelmsford; Chelmsford's own Swatch compares it with areas across England and Wales.

Chelmsford's postcode districts, Hapiest first

#Postcode districtSwatchHomes soldMedian pricePrice change
1 CM2 725£381,000 +1.6%
2 CM3 467£435,000 -0.3%
2 CM11 28£608,750 -11.6%
4 SS11 53£465,000 +8.1%
5 CM1 712£389,000 -2.7%
6 CM4 32£851,250 +1.3%

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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 Chelmsford 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 Chelmsford aren't ranked.