CM4 broadband and area guide
Ofcom coverage, connection speeds, house prices and local data for 417 postcodes across 2 sectors in Brentwood.
Full fibre
0%
Gigabit
48%
Superfast
91%
Postcodes
417
CM4 covers 417 postcodes in Basildon. Gigabit reaches 47.8%, placing it among the weakest performers in this batch.
Broadband speeds in CM4
Share of CM4 premises by the fastest download speed available, averaged across all 417 postcodes in the district.
Superfast coverage spans 90.6% of premises. Gigabit availability is just 47.8%, substantially below peers in Essex. Cable deployment here has not progressed as far as in Chelmsford, Epping Forest, or East Hertfordshire zones. Speed distribution reflects this gap: 47.8% achieve 300 Mbps or above, whilst 42.8% occupy the 30-300 Mbps superfast band. Below-USO coverage is zero. Only 1.7% sit below 10 Mbps. Most premises depend on fibre-to-the-cabinet or limited cable coverage. Wireless contributes 0.5%. CM4 represents a cable rollout laggard within Essex where older technologies still dominate. The high gigabit penetration indicates mature cable or fibre infrastructure reaching most households throughout the district.. Cable networks sustain ultrafast delivery, extending gigabit access to areas where fibre deployment remains incomplete.. The substantial wireless availability indicates multiple infrastructure options for many households, offering flexibility in technology choice.. Postcode verification is essential before committing to a move, as speed availability varies considerably across the area..
Source: Ofcom Connected Nations. Percentages are district-wide averages of postcode-level availability, so rows may not sum to exactly 100%.
Connectivity in detail
Below 10 Mbps USO
0%
Premises unable to get the 10 Mbps universal service minimum
Fixed wireless
<1%
Premises that can use a fixed wireless access service
Broadband by sector
CM4 splits into 2 postcode sectors. Coverage and prices can differ street by street, so open a sector below to find your exact postcode.
| Sector | Postcodes | Superfast | Full fibre | Gigabit |
|---|---|---|---|---|
| CM4 0 | 199 | 95% | 0% | 64% |
| CM4 9 | 218 | 87% | 0% | 33% |
All CM4 0 postcodes (199)
All CM4 9 postcodes (218)
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Living in Brentwood
Most households have adequate superfast speeds, but gigabit remains scarce. Infrastructure investment would open up better performance.
Remote worker score
53/100
Connectivity and amenities for home working
Family score
50/100
Schools, safety and family amenities
Value score
50/100
What you get for the local price level
CM4 broadband FAQs
Why is gigabit availability lower in CM4?
At 47.8%, cable deployment has been less extensive; fibre-to-the-cabinet is the dominant ultrafast technology.
What's the typical speed for most premises?
Around 43% access 30-300 Mbps superfast speeds, whilst 48% have gigabit or higher capability.
Is below-USO coverage a problem here?
No; zero postcodes fall below USO standard, indicating universal adequate coverage.
Are there prospects for gigabit expansion?
Yes; further cable deployment or fibre-to-the-premises investment would increase gigabit availability.
Neighbouring districts
Check your exact postcode
Every postcode in CM4 has its own page with broadband speeds, house prices, school ratings and crime stats. You can also compare providers for your address.
Data sources: Broadband data from Ofcom Connected Nations 2025 · House prices from HM Land Registry · Crime from Police.uk · See all data sources