19 providers offer 213 broadband deals in Castledawson, from £15.00 a month and up to 2,000 Mbps. Typical measured speed is 93 Mbps down and 21 Mbps up, 8% below the UK download average.
Best value broadband deal in Castledawson, Mid Ulster (BT45)
The best value in Castledawson, Mid Ulster (BT45) 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 Castledawson, Mid Ulster (BT45)
£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 Castledawson, Mid Ulster (BT45)
The fastest deal available in Castledawson, Mid Ulster (BT45) 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 Castledawson, Mid Ulster (BT45)
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 Castledawson, Mid Ulster (BT45)
The cheapest deal in Castledawson, Mid Ulster (BT45) 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 Castledawson, Mid Ulster (BT45)
£5/mo
for 6 months, then £25/mo
Avg £20/mo over contract · £480 total over 24 months
Compare broadband deals in Castledawson, Mid Ulster (BT45)
£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 Castledawson, Mid Ulster (BT45)
19 providers serve Castledawson, Mid Ulster (BT45), 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 Castledawson, Mid Ulster (BT45) download speed at 93 Mbps.
Upgrade nudge
Room to upgrade in Castledawson, Mid Ulster (BT45)
Only 16% of the 9,100 connections here are on 300Mbps or faster, even though 94% 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 Castledawson, Mid Ulster (BT45) line runs 93 Mbps.
Working from home
OKStreaming and family use
GoodWhat speeds are people actually getting?
Gigabit reaches 94% of Castledawson, Mid Ulster (BT45), and the fastest available is 1,000 Mbps. The full split by band is below.
Which broadband networks reach Castledawson, Mid Ulster (BT45)?
The wholesale networks carrying Castledawson, Mid Ulster (BT45) broadband, from Openreach to Virgin Media and the altnets, read off the live deals.
Live altnets in Castledawson, Mid Ulster (BT45), drawn from the providers actually selling deals here. Where they reach, the gigabit prices are normally the lowest on the page.
- CityFibre: Sky, The One Broadband
- 4th Utility: 4th Utility, Rise Fibre
Behind the altnets, Openreach and Virgin Media O2 run as the major-network options (Openreach is the country-wide baseline, so it's a given).
Real provider count in Castledawson, Mid Ulster (BT45): 19 actively selling into addresses.
What broadband coverage does Castledawson, Mid Ulster (BT45) have?
Superfast broadband reaches 98% of Castledawson, Mid Ulster (BT45) premises and gigabit 94%, on Ofcom's premise-level data.
Can I rely on mobile broadband in Castledawson, Mid Ulster (BT45)?
Outdoor 5G reaches 98% of Castledawson, Mid Ulster (BT45), but 2% of homes get no indoor 4G from any network, so a mobile backup here wants a window.
How Castledawson, Mid Ulster (BT45) compares within Mid Ulster
Across 10 postcode districts in Mid Ulster, by premises count, typical speed and gigabit coverage.
Nearby areas
Frequently asked questions
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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 Castledawson, Mid Ulster (BT45)come 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.