CM1 postcode area guide — Chelmsford

Where is CM1?

Broadband & internet speeds in CM1

Strong coverage

Broadband availability in the CM1 postcode district (Chelmsford) is Strong — superfast is near-universal and gigabit is rolling out. Across the 1,432 postcodes Ofcom measures in CM1, superfast broadband (30 Mbit/s or faster) reaches 96.2% of premises and gigabit-capable lines are available to 79.8%.

Around 0.3% of premises in CM1 fall below the Universal Service Obligation (a minimum of 10 Mbit/s download and 1 Mbit/s upload), so the overwhelming majority of homes and businesses here can already order a decent fixed line. For a business that depends on its connection, the figures that matter most are gigabit and full-fibre availability — the symmetric, low-contention services we quote leased lines and FTTP against.

Sample postcodes in CM1

Run a speed test to see what you're actually getting, or check your exact postcode.

Mobile signal around Chelmsford

Ofcom's coverage model for the wider Chelmsford district (86,231 premises):

Signal varies street by street — use the mobile coverage checker to compare EE, O2, Three and Vodafone at an exact postcode.

Crime in CM1

Police recorded 303 incidents within about a mile of the centre of CM1 in May 2026 (latest published street-level data). The breakdown:

Raw counts favour busy town centres — a high street with shops and nightlife records more incidents than a residential cul-de-sac. Source: police.uk open data (point sample around the district centroid).

House prices in CM1

Based on 732 sales registered with HM Land Registry in the last 12 months, the median sold price in CM1 is £382,600, down 3.1% on the previous year (£395,000).

Latest recorded sales in CM1

Contains HM Land Registry data © Crown copyright and database right 2026, licensed under the Open Government Licence v3.0.

Who lives here? Chelmsford demographics

Census 2021 figures for the wider Chelmsford district (181,523 residents, 75,401 households):

Source: ONS Census 2021 (district level — the finest openly licensed cut we republish). © Crown copyright, OGL v3.0.

Schools in and around CM1

Source: DfE Get Information about Schools (England & Wales). Check Ofsted report cards for inspection detail — headline one-word grades were retired in 2024.

Food hygiene ratings in CM1

474 rated food businesses operate in CM1. 381 hold the top rating of 5, 32 are rated 4, and 8 are rated 2 or below.

Among the 5-rated: 2MT Caffe, A Batch From Home, A1 Burger Van / Grill And Chill, A1 Roadside Chef Vehicle BX06MLO, A414 Snack Bar.

Source: Food Standards Agency, food hygiene ratings (FHRS) open data.

Energy performance (EPC) in CM1

From a sample of 249 Energy Performance Certificates across 11 CM1 postcodes, the most common rating is band B (average band C). 63% of sampled homes are rated C or better.

Source: MHCLG Energy Performance of Buildings Data (England & Wales), sampled at postcode level and refreshed monthly. Individual certificates are on each postcode’s page.

Phone area codes for Chelmsford

Landlines around CM1 typically use:

Had a call from an unknown number? Use our free UK phone number checker to see who called.

What's it like living in CM1?

Postcodes in CM1

Neighbouring districts

All Chelmsford (CM) postcode districts ›

Frequently asked questions

Sources: HM Land Registry Price Paid Data, police.uk street-level crime, Ofcom Connected Nations, ONS Census 2021, DfE Get Information about Schools, Food Standards Agency FHRS — all © Crown copyright, licensed under the Open Government Licence v3.0. Figures are area aggregates; individual addresses vary. Energy performance (EPC) data will be added when our Open Data Communities registration is approved.