Lisburn and Castlereagh Broadband Coverage
Ranked #10 of 361 UK local authorities by full-fibre coverage. 95.2% is above the UK national average of 77.5%.
The verdict
Lisburn and Castlereagh is one of the best-connected places in the UK — ranked #10 of 361 UK local authorities (top 2.8%) with 95.2% full-fibre coverage, 17.7pp above the 77.5% UK average.
About Broadband in Lisburn and Castlereagh
Lisburn and Castlereagh is a local authority district in Northern Ireland with 67,573 premises in the Ofcom Connected Nations 2025 dataset. Full-fibre (FTTP) broadband is available to 95.2% of premises, and gigabit-capable connectivity reaches 96.2%. Superfast broadband (≥30 Mbit/s) is accessible to 99.5% of premises. Lisburn and Castlereagh ranks 10th nationally out of 361 local authorities by full-fibre coverage.
The gigabit and full-fibre figures reflect the proportion of addresses that can order an FTTP connection from at least one provider — availability does not imply that every household has taken up a service. Full-fibre take-up across all premises stands at 57%, and among premises where coverage is available the figure is 60%. Ofcom defines gigabit-capable as the ability to receive download speeds of at least 1,000 Mbit/s, which in practice means a full-fibre or qualifying cable network must pass the property.
All measured premises meet the Universal Service Obligation threshold of 10 Mbit/s down / 1 Mbit/s up. Figures are drawn from operator network-coverage data submitted to Ofcom and verified through the Connected Nations 2025 methodology. See our methodology page for full details on how premises counts and coverage percentages are calculated.
Coverage by Technology — Lisburn and Castlereagh
Broadband coverage by technology type — Lisburn and Castlereagh, Ofcom Connected Nations 2025
Where Lisburn and Castlereagh Sits Nationally
Lisburn and Castlereagh vs every UK local authority
Full-fibre coverage distribution across all 361 UK local authorities. Lisburn and Castlereagh's 95.2% places it in the highlighted band.
95.2% Top 2.8% ranked #10 of 361 UK authorities
every UK local authority, bucketed by full-fibre coverage
Source: Ofcom Connected Nations 2025 (July 2025, r01)
Full Coverage Data
| Metric | Coverage | Definition |
|---|---|---|
| Full-Fibre (FTTP) | 95.2% | Fibre to the Premises — optical fibre all the way to the property |
| Gigabit-Capable | 96.2% | ≥1,000 Mbit/s download speed available |
| Ultrafast Broadband (≥300 Mbit/s) | 96.2% | UFBB — ≥300 Mbit/s download speed available |
| Ultrafast (≥100 Mbit/s) | 96.2% | ≥100 Mbit/s download speed available |
| Superfast (≥30 Mbit/s) | 99.5% | SFBB — ≥30 Mbit/s download speed available |
| NGA (any next-generation access) | 99.9% | Any NGA network available |
| Below USO Threshold | 0% | Below 10 Mbit/s down / 1 Mbit/s up USO minimum |
| Full-Fibre Take-Up (all premises) | 57% | % of all premises actively using a full-fibre connection |
| Full-Fibre Take-Up (covered premises) | 60% | % of premises where FTTP is available that have taken it up |
| Total Premises | 67,573 | All premises in Ofcom's matched dataset |
| National Rank (Full-Fibre) | #10 / 361 | Ranking among all UK local authorities by full-fibre coverage |
Coverage Analysis
Lisburn and Castlereagh's full-fibre coverage of 95.2% places it at rank 10 nationally. The gap between full-fibre availability (95.2%) and gigabit availability (96.2%) reflects whether any qualifying cable networks supplement the FTTP rollout in this district. Where the two figures are close, full-fibre is effectively the sole gigabit delivery mechanism.
Superfast coverage at 99.5% gives a sense of the floor for most residents — the majority of premises in Lisburn and Castlereagh can receive at least 30 Mbit/s. The USO gap of 0% represents premises that cannot yet access the government-mandated minimum of 10 Mbit/s download and 1 Mbit/s upload. In rural local authorities this figure can reach double digits; in dense urban areas it typically approaches zero.
Take-up data provides a demand-side view. With 57% of all premises actively using full-fibre, Lisburn and Castlereagh gives a clear picture of how quickly residents are switching to future-proof connections as they become available.
Related
Source: Ofcom, Connected Nations 2025 — UK Fixed Broadband Coverage, July 2025 (r01).
Source: Open Government Licence v3.0.
Frequently Asked Questions
What is the full-fibre broadband coverage in Lisburn and Castlereagh?
According to Ofcom Connected Nations 2025 (July 2025, r01), 95.2% of premises in Lisburn and Castlereagh have access to full-fibre (FTTP) broadband. Full-fibre connects properties using optical fibre all the way from the exchange, enabling gigabit-speed connections. The UK national average is approximately 77.5%.
How does Lisburn and Castlereagh compare nationally for broadband coverage?
Lisburn and Castlereagh ranks 10th out of 361 UK local authorities by full-fibre coverage (95.2%). Gigabit-capable coverage stands at 96.2% and superfast (≥30 Mbit/s) coverage at 99.5%. Figures are from Ofcom Connected Nations 2025.
Does Lisburn and Castlereagh meet the broadband Universal Service Obligation?
The Broadband Universal Service Obligation (USO) guarantees access to at least 10 Mbit/s download and 1 Mbit/s upload. Ofcom's Connected Nations 2025 data shows all measured premises in Lisburn and Castlereagh meet this threshold.
Source: Ofcom, Connected Nations 2025 — UK Fixed Broadband Coverage (July 2025, r01). Retrieved and formatted by Kiznis Studio Editorial. Disclaimer: Coverage figures show availability, not guaranteed service quality or actual take-up. Published under the Open Government Licence v3.0.