BT81 postcode area guide — Derry City and Strabane
House prices, crime, broadband speeds, mobile signal, schools and demographics for the BT81 postcode district in Derry City and Strabane — every official dataset on one page.
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Where is BT81?
Broadband & internet speeds in BT81
Excellent coverage
Superfast (30Mb+)
93.8%
Ultrafast (300Mb+)
89.1%
Gigabit-capable
89.1%
Below USO (10Mb)
2.9%
Broadband availability in the BT81 postcode district (Derry City and Strabane) is Excellent — gigabit-capable full fibre is widely available. Across the 294 postcodes Ofcom measures in BT81, superfast broadband (30 Mbit/s or faster) reaches 93.8% of premises and gigabit-capable lines are available to 89.1%.
Around 2.9% of premises in BT81 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 BT81
| Postcode | Superfast | Gigabit |
|---|---|---|
| BT81 7AB | 100% | 100% |
| BT81 7AF | 100% | 91.3% |
| BT81 7AG | 100% | 100% |
| BT81 7AJ | 100% | 100% |
| BT81 7AL | 0% | 0% |
| BT81 7AN | 100% | 100% |
| BT81 7AP | 100% | 100% |
| BT81 7AQ | 100% | 100% |
| BT81 7AR | 100% | 100% |
| BT81 7AS | 100% | 84.2% |
Run a speed test to see what you're actually getting, or check your exact postcode.
Mobile signal around Derry City and Strabane
Ofcom's coverage model for the wider Derry City And Strabane district (69,350 premises):
4G indoors — all networks
78.4%
4G outdoors — all networks
96.9%
5G outdoors — all networks
27.7%
Voice indoors — all networks
79.3%
Signal varies street by street — use the mobile coverage checker to compare EE, O2, Three and Vodafone at an exact postcode.
Crime in BT81
Police recorded 1 incidents within about a mile of the centre of BT81 in May 2026 (latest published street-level data). The breakdown:
| Category | Incidents | Share |
|---|---|---|
| Violence & sexual offences | 1 | 100.0% |
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).
Food hygiene ratings in BT81
72 rated food businesses operate in BT81. 46 hold the top rating of 5, 12 are rated 4, and none are currently rated 2 or below.
Among the 5-rated: Bus Stop Newsagents, Castlederg Childcare Services, Castlederg High School Meals Kitchen, Co-op Store, D J & M M McHugh's.
Source: Food Standards Agency, food hygiene ratings (FHRS) open data.
Phone area codes for Derry City and Strabane
Landlines around BT81 typically use:
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What's it like living in BT81?
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Moving to BT81? Sort your connectivity first
We arrange broadband, full-fibre, leased lines, VoIP and business mobiles across Derry City and Strabane — free, no-obligation quote.
Postcodes in BT81
Neighbouring districts
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Frequently asked questions
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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.