13 providers offer 45 broadband deals in Grendon Underwood, from £19 a month and up to 830 Mbps. Typical measured speed is 56 Mbps down and 115 Mbps up, 45% below the UK download average. Full fibre is available to 93.8% of homes.
Deals for Grendon Underwood, checked and refreshed daily.
Best value broadband deal in Grendon Underwood
The best value in Grendon Underwood 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 Grendon Underwood
£24/mo
No rises, no surprises.
Cheapest broadband deal in Grendon Underwood
The cheapest deal in Grendon Underwood 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 Grendon Underwood
£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 Grendon Underwood
The fastest deal available in Grendon Underwood is Galileo 900 from Gigaclear at 830 Mbps.
Fastest in Grendon Underwood
£29/mo
No rises, no surprises.
Compare broadband deals in Grendon Underwood
£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 Grendon Underwood
13 providers serve Grendon Underwood 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 Grendon Underwood download speed at 56 Mbps.
Upgrade nudge
Room to upgrade in Grendon Underwood
Only 19% 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 Grendon Underwood line runs 56 Mbps.
Working from home
OKStreaming and family use
OKWhat speeds are people actually getting?
Gigabit reaches 94% of Grendon Underwood, and the fastest available is 1,000 Mbps. The full split by band is below.
What broadband coverage does Grendon Underwood have?
Superfast broadband reaches 100% of Grendon Underwood premises but gigabit only 94%, so around 6% of homes can get fast broadband but not the fastest.
Can I rely on mobile broadband in Grendon Underwood?
Outdoor 5G reaches 100% of Grendon Underwood 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.
5G & 4G home broadband
Outdoor 5G covers 100% of Grendon Underwood, enough for a 5G home-broadband hub to stand in for a fixed line.
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Speed and coverage figures for Grendon Underwoodcome 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.