Chelmsford broadband coverage (CM)
Full-fibre, gigabit and superfast availability across every CM postcode district in East of England — plus business broadband and leased lines.
Strong coverage
Superfast (30Mb+)
94.2%
Ultrafast (300Mb+)
76.7%
Gigabit-capable
75.8%
Below USO (10Mb)
—
Check your exact CM postcode
Area figures average a whole postcode region — get the precise availability, full-fibre status and mobile signal for your address.
Broadband across the CM area
The CM postcode area covers Chelmsford and the surrounding East of England region, spanning 25 outward-code districts. Overall fixed-broadband provision across CM is strong: superfast reaches about 94.2% of premises and gigabit-capable connectivity is available to roughly 75.8%.
Availability is never uniform across a whole postcode area — city-centre CM districts are typically further ahead on full fibre than outlying towns and rural fringes. Use the district breakdown below to see how each CM outcode compares, then check an exact postcode for the definitive answer.
Advertisement
CM districts compared
Each CM outward code ranked by size. Click a district for its full breakdown and a postcode-level check.
| District | Area | Superfast | Gigabit |
|---|---|---|---|
| CM3 | Braintree | 93% | 63.5% |
| CM1 | Chelmsford | 96.2% | 79.8% |
| CM2 | Chelmsford | 98% | 85.4% |
| CM7 | Braintree | 96.3% | 86.8% |
| CM23 | East Hertfordshire | 95.2% | 72.2% |
| CM9 | Braintree | 96.1% | 81.8% |
| CM6 | Braintree | 95.4% | 79% |
| CM8 | Braintree | 97.2% | 79.9% |
| CM13 | Basildon | 94.8% | 77.3% |
| CM16 | Epping Forest | 91.5% | 79.9% |
| CM15 | Brentwood | 97.1% | 76.1% |
| CM14 | Brentwood | 96.6% | 69.9% |
| CM20 | East Hertfordshire | 88.9% | 67.4% |
| CM0 | Maldon | 93.3% | 69.8% |
| CM17 | Epping Forest | 97% | 77.6% |
| CM22 | East Hertfordshire | 96.8% | 88.6% |
| CM12 | Basildon | 97.9% | 80.9% |
| CM77 | Braintree | 92.3% | 84.6% |
| CM11 | Basildon | 94.3% | 81.4% |
| CM5 | Brentwood | 91.6% | 88.3% |
| CM18 | Epping Forest | 99.1% | 92.2% |
| CM4 | Basildon | 90.1% | 45% |
| CM19 | East Hertfordshire | 90.6% | 76.8% |
| CM21 | East Hertfordshire | 93.8% | 63% |
| CM24 | Uttlesford | 81.3% | 46.8% |
Business broadband & leased lines in Chelmsford
Connection Technologies arranges business broadband, full-fibre (FTTP) and leased lines right across the CM area. Where gigabit full fibre is live we quote ultrafast symmetric connections; everywhere else a leased line still guarantees the speed and SLA your business needs.
Get a business broadband quote in Chelmsford
Free and no obligation — matched to what's actually available at your postcode.
Advertisement
Frequently asked questions
What broadband speeds are available in the CM postcode area (Chelmsford)?
Can I get full-fibre or gigabit broadband in the CM postcode area (Chelmsford)?
How do I check broadband at my exact address in the CM postcode area (Chelmsford)?
Who provides business broadband in the CM postcode area (Chelmsford)?
Broadband availability data © 2026 Ofcom (Connected Nations), licensed under the Open Government Licence v3.0. Figures are area averages and predictions; availability at an individual address may differ — always confirm with a postcode-level check.