Full fibre reaches 95.5% of homes in Castle, though only 23% of connections run at 300 Mbps or faster. Typical measured speed is 138 Mbps down and 29 Mbps up, 37% above the UK download average. 16 providers offer 165 broadband deals, up to 1,600 Mbps.
Deals for Castle (BT38), checked and refreshed daily.
Best value broadband deal in Castle (BT38)
The best value in Castle (BT38) on full first-year cost is 4th Utility's 300Mb Full Fibre (24 Months): £240 across year one, about £20 a month. At 300 Mbps it copes with anything a household runs at once.
Best value in Castle (BT38)
£20/mo
for 12 months, then £40/mo
Cheapest broadband deal in Castle (BT38)
The cheapest deal in Castle (BT38) 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 (BT38)
£19.99/mo
No rises, no surprises.
Runner-up on price
£20/mo
for 12 months, then £40/mo
Fastest broadband deal in Castle (BT38)
The fastest deal available in Castle (BT38) is Full Fibre 1.6GB from EE at 1,600 Mbps. Zen Internet matches it at the same top speed.
Fastest in Castle (BT38)
£38.99/mo
rises to £42.99 in March 2027 (+£4)
Runner-up on speed
£45/mo
No rises, no surprises.
Compare broadband deals in Castle (BT38)
£22.99/mo
rises to £26.99 in March 2027 (+£4)
£27.99/mo
rises to £31.99 in March 2027 (+£4)
£23/mo
No rises, no surprises.
£23/mo
No rises, no surprises.
Broadband providers in Castle (BT38)
16 providers serve Castle (BT38) including Virgin Media, Sky and BT, 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 (BT38) download speed at 138 Mbps.
Upgrade nudge
Room to upgrade in Castle (BT38)
Only 23% of the 11,000 connections here are on 300Mbps or faster, even though 96% 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 (BT38) line runs 138 Mbps.
Working from home
OKStreaming and family use
GoodWhat speeds are people actually getting?
Gigabit reaches 96% of Castle (BT38), and the fastest available is 1,000 Mbps. The full split by band is below.
What broadband coverage does Castle (BT38) have?
Superfast broadband reaches 99% of Castle (BT38) premises and gigabit 96%, on Ofcom's premise-level data.
Can I rely on mobile broadband in Castle (BT38)?
Outdoor 5G reaches 100% of Castle (BT38) homes. Here is how mobile holds up if the line drops.
The two 5G figures differ. “5G availability” is everyday 5G running on the existing 4G core, which is what most phones show. “Next-gen 5G” is standalone 5G: a full 5G network with lower lag, still reaching fewer places.
How Castle (BT38) compares within Mid and East Antrim
Across 4 postcode districts in Mid and East Antrim, by connection count, typical speed and gigabit coverage.
Nearby areas
Frequently asked questions
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Speed and coverage figures for Castle (BT38)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.