Ofcom data · 416 postcodes

CM4 broadband coverage — Basildon

Full-fibre, gigabit and superfast broadband availability across the CM4 postcode district, plus business broadband and leased-line options for Basildon.

Strong coverage

Superfast (30Mb+)

90.1%

Ultrafast (300Mb+)

45%

Gigabit-capable

45%

Below USO (10Mb)

0.1%

Check broadband at your exact CM4 postcode

District figures are an average — get the precise availability, full-fibre status and mobile signal for your address.

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Broadband in CM4

Broadband availability in the CM4 postcode district (Basildon) is Strong — superfast is near-universal and gigabit is rolling out. Across the 416 postcodes Ofcom measures in CM4, superfast broadband (30 Mbit/s or faster) reaches 90.1% of premises and gigabit-capable lines are available to 45%.

Around 0.1% of premises in CM4 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 CM4

Postcode	Superfast	Gigabit
CM4 0AA	100%	100%
CM4 0AB	100%	59.3%
CM4 0AD	100%	89.2%
CM4 0AE	95.2%	95.2%
CM4 0AF	100%	88.5%
CM4 0AG	100%	100%
CM4 0AH	100%	87.8%
CM4 0AJ	100%	37.2%
CM4 0AL	100%	3.2%
CM4 0AN	100%	100%

Business broadband & leased lines in Basildon

Whether the CM4 district has full fibre yet or not, we can connect your business. Where FTTP and gigabit are live we quote ultrafast full-fibre; where they aren't, a leased line still delivers guaranteed, symmetric speeds with an SLA. We also handle mobile coverage and VoIP for the same site.

Get a business broadband quote for CM4

Free, no obligation — full fibre, leased line or FTTC, matched to what's actually available at your postcode.

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Nearby CM districts

CM3 — 63.5% gigabit CM1 — 79.8% gigabit CM2 — 85.4% gigabit CM7 — 86.8% gigabit CM23 — 72.2% gigabit CM9 — 81.8% gigabit CM6 — 79% gigabit CM8 — 79.9% gigabit CM13 — 77.3% gigabit CM16 — 79.9% gigabit

See all Chelmsford (CM) broadband coverage ›

Frequently asked questions

What broadband speeds are available in the CM4 area (Basildon)?

In the CM4 area (Basildon), superfast broadband (30 Mbit/s+) is available to approximately 90.1% of premises and gigabit-capable broadband to around 45%, based on Ofcom Connected Nations data. Exact availability varies by postcode — enter your full postcode in our checker for a precise result.

Can I get full-fibre or gigabit broadband in the CM4 area (Basildon)?

Gigabit-capable coverage in the CM4 area (Basildon) stands at about 45% of premises. Where gigabit and full-fibre (FTTP) are live, businesses can order symmetric, low-latency connections — ideal for cloud, VoIP and multi-site working. If full fibre hasn't reached your premises yet, a leased line can still deliver guaranteed gigabit speeds.

How do I check broadband at my exact address in the CM4 area (Basildon)?

Use the free broadband postcode checker on this page: enter your postcode to see fixed-broadband availability, gigabit/full-fibre coverage and mobile signal for all four networks at that location, sourced from official Ofcom data.

Who provides business broadband in the CM4 area (Basildon)?

Most UK providers serve the CM4 area (Basildon) over the Openreach and (where present) CityFibre or Virgin Media networks. Connection Technologies arranges business broadband, full-fibre (FTTP) and leased lines across the area — request a quote to compare options for your postcode.

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.