12 providers offer 44 broadband deals in Castle Cary, from £19 a month and up to 830 Mbps. Typical measured speed is 68 Mbps down and 39 Mbps up, 33% below the UK download average. Full fibre is available to 85.1% of homes.
Deals for Castle Cary, checked and refreshed daily.
Best value broadband deal in Castle Cary
The best value in Castle Cary on full first-year cost is Gigaclear's Odyssey 600: £288 across year one, about £24 a month. A £40 gift card is bundled in. At 600 Mbps it copes with anything a household runs at once.
Best value in Castle Cary
£24/mo
No rises, no surprises.
Cheapest broadband deal in Castle Cary
The cheapest deal in Castle Cary is Explorer 300 from Gigaclear at £19.00 a month for 300 Mbps. It's full fibre, so the advertised speed is the speed that reaches the router. It also throws in a £30 gift card. Onestream is essentially level at £20.86 a month.
Cheapest in Castle Cary
£19/mo
No rises, no surprises.
Runner-up on price
£19.94/mo
rises to £22.69 in April 2027 (+£2.75)
Fastest broadband deal in Castle Cary
The fastest deal available in Castle Cary is Galileo 900 from Gigaclear at 830 Mbps.
Fastest in Castle Cary
£29/mo
No rises, no surprises.
Compare broadband deals in Castle Cary
£24/mo
No rises, no surprises.
£22.99/mo
rises to £26.99 in March 2027 (+£4)
£19.94/mo
rises to £22.69 in April 2027 (+£2.75)
£21/mo
rises to £24 in April 2027 (+£3)
Broadband providers in Castle Cary
12 providers serve Castle Cary including Sky, BT and Vodafone, with Gigaclear the fastest at 830 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 Cary download speed at 68 Mbps.
Upgrade nudge
Room to upgrade in Castle Cary
Only 7% of the 1,200 connections here are on 300Mbps or faster, even though 85% 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 Cary line runs 68 Mbps.
Working from home
OKStreaming and family use
OKWhat speeds are people actually getting?
Gigabit reaches 85% of Castle Cary, and the fastest available is 1,000 Mbps. The full split by band is below.
What broadband coverage does Castle Cary have?
Superfast broadband reaches 99% of Castle Cary premises but gigabit only 85%, so around 14% of homes can get fast broadband but not the fastest.
Can I rely on mobile broadband in Castle Cary?
Outdoor 5G reaches 95% of Castle Cary 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.
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Speed and coverage figures for Castle Carycome 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.