19 providers offer 219 broadband deals in Lisburn and Castlereagh, from £15.00 a month and up to 2,000 Mbps. Typical measured speed is 131 Mbps down and 27 Mbps up, 30% above the UK download average.
Best value broadband deal in Lisburn and Castlereagh
The best value in Lisburn and Castlereagh on full first-year cost is Plusnet's Full Fibre 145: £292 across year one, about £24 a month. A £155 reward card is bundled in. 145 Mbps covers streaming, video calls and working from home.
Best value in Lisburn and Castlereagh
£22.99/mo
rises to £26.99 in March 2027 (+£4)
Avg £26.32/mo over contract · £632 total over 24 months
Fastest broadband deal in Lisburn and Castlereagh
The fastest deal available in Lisburn and Castlereagh is Gig2 Fibre broadband + Netflix from Virgin Media O2 at 2,000 Mbps. Next fastest is Full Fibre 1.6GB Premium from EE at 1,600 Mbps.
Fastest in Lisburn and Castlereagh
Gig2 Fibre broadband + Netflix
200 Mbps upload · Hybrid Fibre-Coaxial
Best for power users & big households
£51.99/mo
rises to £55.99 in April 2027 (+£4)
Avg £54.99/mo over contract · £1320 total over 24 months
Runner-up on speed
Full Fibre 1.6GB Premium
115 Mbps upload · Full Fibre
Best for power users & big households
£33.99/mo
rises to £37.99 in March 2027 (+£4)
Avg £37.32/mo over contract · £896 total over 24 months
Cheapest broadband deal in Lisburn and Castlereagh
The cheapest deal in Lisburn and Castlereagh is Fast 24m from giffgaff at £5.00 a month for 200 Mbps. It's full fibre, so the advertised speed is the speed that reaches the router. The £5.00 is an intro price that rises to £25.00 a month after the intro window, making the real first-year cost £180. Comfortably faster than the UK average.
Cheapest in Lisburn and Castlereagh
£5/mo
for 6 months, then £25/mo
Avg £20/mo over contract · £480 total over 24 months
Compare broadband deals in Lisburn and Castlereagh
£5/mo
for 6 months, then £28/mo
Avg £22.25/mo over contract · £534 total over 24 months
Full Fibre 1.6GB Premium
115 Mbps upload · Full Fibre
Best for power users & big households
£33.99/mo
rises to £37.99 in March 2027 (+£4)
Avg £37.32/mo over contract · £896 total over 24 months
Sky Full Fibre Gigafast
100 Mbps upload · Full Fibre
Best for power users & big households
£31/mo
No rises, no surprises.
£749 total over 24 months
Onestream Fibre 55
10 Mbps upload · Hybrid Fibre
Best for small homes, single 4K streamer
£19.94/mo
rises to £22.69 in April 2027 (+£2.75)
Avg £22/mo over contract · £528 total over 24 months
Broadband providers in Lisburn and Castlereagh
19 providers serve Lisburn and Castlereagh, with Virgin Media O2 the fastest at 2,000 Mbps.
Ranked by Ofcom complaints per 100,000 customers, fewest first. A down arrow is below the industry average, up is above, and a dash means Ofcom publishes no figure for that provider (usually because it is below Ofcom's 1.5% market-share reporting threshold). A small diagonal arrow shows the past-year trend (↘ improving, ↗ getting worse).
Ofcom records the typical Lisburn and Castlereagh download speed at 131 Mbps.
Upgrade nudge
Room to upgrade in Lisburn and Castlereagh
Only 22% of the 41,000 connections here are on 300Mbps or faster, even though 95% can get gigabit.
The faster line is already there. For most of these homes it is the contract holding them back, not the infrastructure.
Is your broadband good enough?
The typical Lisburn and Castlereagh line runs 131 Mbps.
Working from home
OKStreaming and family use
GoodWhat speeds are people actually getting?
Gigabit reaches 95% of Lisburn and Castlereagh, and the fastest available is 1,000 Mbps. The full split by band is below.
Which broadband networks reach Lisburn and Castlereagh?
The wholesale networks carrying Lisburn and Castlereagh broadband, from Openreach to Virgin Media and the altnets, read off the live deals.
Altnets present in Lisburn and Castlereagh, derived from who is actually selling into addresses here. Worth checking your specific address because their footprints can stop and start a few doors apart.
- CityFibre: Sky, The One Broadband, Vodafone
- 4th Utility: 4th Utility, Rise Fibre
Openreach and Virgin Media O2 run alongside the altnets in Lisburn and Castlereagh (Openreach is the universal default, so the address question is which altnet, not whether Openreach).
19 providers compete for Lisburn and Castlereagh broadband customers right now.
What broadband coverage does Lisburn and Castlereagh have?
Superfast broadband reaches 99% of Lisburn and Castlereagh premises and gigabit 95%, on Ofcom's premise-level data.
Can I rely on mobile broadband in Lisburn and Castlereagh?
Outdoor 5G reaches 100% of Lisburn and Castlereagh homes. Here is how mobile holds up if the line drops.
Broadband speeds by Lisburn and Castlereagh neighbourhood
Measured speeds range from 166 Mbps in Carrowreagh to 85 Mbps in Hillsborough, so your street matters more than the Lisburn and Castlereagh average.
| Neighbourhood | Median | vs area | Upload | Superfast | Gigabit | 5G |
|---|---|---|---|---|---|---|
| Carrowreagh BT16 | 166 | +35 | 28 | 99% | 97% | 100% |
| Carryduff BT8 | 150 | +19 | 28 | 99% | 93% | 100% |
| White Mountain BT28 | 138 | +7 | 27 | 99% | 94% | 100% |
| Blaris BT27 | 134 | +3 | 26 | 99% | 96% | 100% |
| Hillsborough BT26 | 85 | -46 | 24 | 98% | 94% | 100% |
Measured Ofcom data per Lisburn and Castlereagh neighbourhood, ranked fastest first. Median and upload are in Mbps; vs area is the median difference from the Lisburn and Castlereagh average; superfast, gigabit and 5G are the % of premises covered. Swipe the table sideways for more columns.
Nearby areas
Frequently asked questions
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See what's actually live in Lisburn and Castlereagh.
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* Based on Go.Compare research estimating that 28% of UK broadband users pay for faster broadband speeds than they need (which we interpret as overpaying), equivalent to around 7.5m UK households.
Speed and coverage figures for Lisburn and Castlereaghcome from Ofcom's Connected Nations data, current to January 2026. Deal prices are pulled live from providers. Compiled by the FindBroadband team. See how we rank and source our data.