CM1 1SY is a postcode on Broomfield Road in Chelmsford, Essex. Over the last five years, 11 properties have changed hands in this postcode, with an average sale price of £361,000. Prices have ranged from £16,000 to £1,425,000. The most recent recorded sale was in August 2025. The housing stock here is predominantly Flat (85%) with some Other properties.

According to the 2019 English Index of Multiple Deprivation, the neighbourhood around CM1 1SY is considered less deprived than average for England (decile 8 out of 10, ranked 24,690 nationally). Crime levels are broadly in line with the national average (crime deprivation decile 7). Within a quarter of a mile, 44 crimes have been recorded in the dataset, with Violence And Sexual Offences being the most reported category. There are 20 schools within one mile, with the nearest being King Edward VI Grammar School, Chelmsford. The area scores well above average for education and skills (education decile 8).