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Ofcom data · 570 postcodes

BT27 broadband coverage — Lisburn and Castlereagh

Full-fibre, gigabit and superfast broadband availability across the BT27 postcode district, plus business broadband and leased-line options for Lisburn and Castlereagh.

Excellent coverage

Superfast (30Mb+)

98.7%

Ultrafast (300Mb+)

93.4%

Gigabit-capable

93.4%

Below USO (10Mb)

0.1%

Check broadband at your exact BT27 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 BT27

Broadband availability in the BT27 postcode district (Lisburn and Castlereagh) is Excellent — gigabit-capable full fibre is widely available. Across the 570 postcodes Ofcom measures in BT27, superfast broadband (30 Mbit/s or faster) reaches 98.7% of premises and gigabit-capable lines are available to 93.4%.

Around 0.1% of premises in BT27 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 BT27

PostcodeSuperfastGigabit
BT27 4AA100%100%
BT27 4AB100%88.9%
BT27 4AD100%100%
BT27 4AE97.5%97.5%
BT27 4AG100%100%
BT27 4AJ100%100%
BT27 4AL100%43.5%
BT27 4AN100%100%
BT27 4AQ100%100%
BT27 4AR100%100%

Business broadband & leased lines in Lisburn and Castlereagh

Whether the BT27 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 BT27

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

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Nearby BT districts

BT34 — 90.2% gigabitBT23 — 92.4% gigabitBT92 — 73.4% gigabitBT47 — 81% gigabitBT35 — 84.7% gigabitBT78 — 82.7% gigabitBT48 — 90.5% gigabitBT30 — 89.8% gigabitBT71 — 87.1% gigabitBT36 — 95.9% gigabit

See all Belfast (BT) broadband coverage ›

Frequently asked questions

What broadband speeds are available in the BT27 area (Lisburn and Castlereagh)?
In the BT27 area (Lisburn and Castlereagh), superfast broadband (30 Mbit/s+) is available to approximately 98.7% of premises and gigabit-capable broadband to around 93.4%, 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 BT27 area (Lisburn and Castlereagh)?
Gigabit-capable coverage in the BT27 area (Lisburn and Castlereagh) stands at about 93.4% 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 BT27 area (Lisburn and Castlereagh)?
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 BT27 area (Lisburn and Castlereagh)?
Most UK providers serve the BT27 area (Lisburn and Castlereagh) 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.

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