18 providers offer 206 broadband deals in Castle Demesne, from £19.99 a month and up to 1,600 Mbps. Typical measured speed is 103 Mbps down and 24 Mbps up, in line with the UK download average.
Best value broadband deal in Castle Demesne, Mid and East Antrim (BT43)
The best value in Castle Demesne, Mid and East Antrim (BT43) 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 Castle Demesne, Mid and East Antrim (BT43)
£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 Castle Demesne, Mid and East Antrim (BT43)
The fastest deal available in Castle Demesne, Mid and East Antrim (BT43) is Full Fibre 1.6GB Premium from EE at 1,600 Mbps.
Fastest in Castle Demesne, Mid and East Antrim (BT43)
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 Castle Demesne, Mid and East Antrim (BT43)
The cheapest deal in Castle Demesne, Mid and East Antrim (BT43) is Full Fibre 150 from Fibrus at £19.99 a month for 159 Mbps. It's full fibre, so the advertised speed is the speed that reaches the router. 4th Utility is essentially level at £20.00 a month. Comfortably faster than the UK average.
Cheapest in Castle Demesne, Mid and East Antrim (BT43)
£19.99/mo
No rises, no surprises.
£360 total over 18 months
Runner-up on price
300Mb Full Fibre (24 Months)
300 Mbps upload · Full Fibre
Best for 4–5 person households, heavy use
£20/mo
for 12 months, then £40/mo
Avg £30/mo over contract · £720 total over 24 months
Compare broadband deals in Castle Demesne, Mid and East Antrim (BT43)
300Mb Full Fibre (24 Months)
300 Mbps upload · Full Fibre
Best for 4–5 person households, heavy use
£20/mo
for 12 months, then £40/mo
Avg £30/mo over contract · £720 total over 24 months
Gig1 Broadband Only
41 Mbps upload · Hybrid Fibre-Coaxial
Best for power users & big households
£25.99/mo
rises to £29.99 in April 2027 (+£4)
Avg £28.99/mo over contract · £696 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 Castle Demesne, Mid and East Antrim (BT43)
18 providers serve Castle Demesne, Mid and East Antrim (BT43), with EE the fastest at 1,600 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 Castle Demesne, Mid and East Antrim (BT43) download speed at 103 Mbps.
Upgrade nudge
Room to upgrade in Castle Demesne, Mid and East Antrim (BT43)
Only 16% of the 5,900 connections here are on 300Mbps or faster, even though 92% 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 Castle Demesne, Mid and East Antrim (BT43) line runs 103 Mbps.
Working from home
OKStreaming and family use
GoodWhat speeds are people actually getting?
Gigabit reaches 92% of Castle Demesne, Mid and East Antrim (BT43), and the fastest available is 1,000 Mbps. The full split by band is below.
Which broadband networks reach Castle Demesne, Mid and East Antrim (BT43)?
The wholesale networks carrying Castle Demesne, Mid and East Antrim (BT43) broadband, from Openreach to Virgin Media and the altnets, read off the live deals.
Where Castle Demesne, Mid and East Antrim (BT43) has working altnets, the gigabit market suddenly looks competitive. Here are the ones that have built into the streets here.
- CityFibre: Sky, The One Broadband
- 4th Utility: 4th Utility, Rise Fibre
Openreach and Virgin Media O2 run alongside the altnets in Castle Demesne, Mid and East Antrim (BT43) (Openreach is the universal default, so the address question is which altnet, not whether Openreach).
18 providers compete for Castle Demesne, Mid and East Antrim (BT43) broadband customers right now.
What broadband coverage does Castle Demesne, Mid and East Antrim (BT43) have?
Superfast broadband reaches 99% of Castle Demesne, Mid and East Antrim (BT43) premises but gigabit only 92%, so around 7% of homes can get fast broadband but not the fastest.
Can I rely on mobile broadband in Castle Demesne, Mid and East Antrim (BT43)?
Outdoor 5G reaches 99% of Castle Demesne, Mid and East Antrim (BT43) homes. Here is how mobile holds up if the line drops.
How Castle Demesne, Mid and East Antrim (BT43) compares within Mid and East Antrim
Across 4 postcode districts in Mid and East Antrim, 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 Castle Demesne, Mid and East Antrim (BT43)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.