BT27 postcode area guide — Lisburn and Castlereagh
House prices, crime, broadband speeds, mobile signal, schools and demographics for the BT27 postcode district in Lisburn and Castlereagh — every official dataset on one page.
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Where is BT27?
Broadband & internet speeds in BT27
Excellent coverage
Superfast (30Mb+)
98.7%
Ultrafast (300Mb+)
93.4%
Gigabit-capable
93.4%
Below USO (10Mb)
0.1%
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
| Postcode | Superfast | Gigabit |
|---|---|---|
| BT27 4AA | 100% | 100% |
| BT27 4AB | 100% | 88.9% |
| BT27 4AD | 100% | 100% |
| BT27 4AE | 97.5% | 97.5% |
| BT27 4AG | 100% | 100% |
| BT27 4AJ | 100% | 100% |
| BT27 4AL | 100% | 43.5% |
| BT27 4AN | 100% | 100% |
| BT27 4AQ | 100% | 100% |
| BT27 4AR | 100% | 100% |
Run a speed test to see what you're actually getting, or check your exact postcode.
Mobile signal around Lisburn and Castlereagh
Ofcom's coverage model for the wider Lisburn And Castlereagh district (67,974 premises):
4G indoors — all networks
83.7%
4G outdoors — all networks
99.4%
5G outdoors — all networks
59%
Voice indoors — all networks
85.5%
Signal varies street by street — use the mobile coverage checker to compare EE, O2, Three and Vodafone at an exact postcode.
Crime in BT27
Police recorded 195 incidents within about a mile of the centre of BT27 in May 2026 (latest published street-level data). The breakdown:
| Category | Incidents | Share |
|---|---|---|
| Violence & sexual offences | 68 | 34.9% |
| Anti-social behaviour | 55 | 28.2% |
| Criminal damage & arson | 19 | 9.7% |
| Other theft | 18 | 9.2% |
| Shoplifting | 13 | 6.7% |
| Drugs | 9 | 4.6% |
| Burglary | 5 | 2.6% |
| Other crime | 4 | 2.1% |
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).
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Food hygiene ratings in BT27
161 rated food businesses operate in BT27. 131 hold the top rating of 5, 14 are rated 4, and 1 are rated 2 or below.
Among the 5-rated: A MULHOLLAND BUTCHER, ANDERSONS TRADITIONAL FISH & CHIPS, Apache Pizza, Applegreen M1 Northbound, Applegreen M1 Southbound.
Source: Food Standards Agency, food hygiene ratings (FHRS) open data.
Phone area codes for Lisburn and Castlereagh
Landlines around BT27 typically use:
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What's it like living in BT27?
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Moving to BT27? Sort your connectivity first
We arrange broadband, full-fibre, leased lines, VoIP and business mobiles across Lisburn and Castlereagh — free, no-obligation quote.
Postcodes in BT27
Neighbouring districts
All Belfast (BT) postcode districts ›
Frequently asked questions
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What broadband can I get in BT27?
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.