19 providers offer 283 broadband deals in Castle, from £13.50 a month and up to 5,000 Mbps. Typical measured speed is 123 Mbps down and 21 Mbps up, 22% above the UK download average.
Best value broadband deal in Castle, West Northamptonshire (NN1)
The best value in Castle, West Northamptonshire (NN1) 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, West Northamptonshire (NN1)
£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, West Northamptonshire (NN1)
The fastest deal available in Castle, West Northamptonshire (NN1) is Full Fibre 5 Gigafast+ from Sky at 5,000 Mbps.
Fastest in Castle, West Northamptonshire (NN1)
Full Fibre 5 Gigafast+
3000 Mbps upload · Full Fibre
Best for power users & big households
£80/mo
No rises, no surprises.
£1925 total over 24 months
Cheapest broadband deal in Castle, West Northamptonshire (NN1)
The cheapest deal in Castle, West Northamptonshire (NN1) is 150Mb Full Fibre CityFibre (24 Months) from 4th Utility at £13.50 a month for 150 Mbps. It's full fibre, so the advertised speed is the speed that reaches the router. The £13.50 is an intro price that rises to £18.00 a month after the intro window, making the real first-year cost £162. giffgaff is essentially level at £15.00 a month. Above the UK average on download.
Cheapest in Castle, West Northamptonshire (NN1)
150Mb Full Fibre CityFibre (24 Months)
150 Mbps upload · Full Fibre
Best for 2–3 person homes, 4K streaming
£13.50/mo
for 12 months, then £18/mo
Avg £15.75/mo over contract · £378 total over 24 months
Runner-up on price
£5/mo
for 6 months, then £25/mo
Avg £20/mo over contract · £480 total over 24 months
Compare broadband deals in Castle, West Northamptonshire (NN1)
£5/mo
for 6 months, then £25/mo
Avg £20/mo over contract · £480 total over 24 months
£29/mo
rises to £31 in April 2027 (+£2)
Avg £30.50/mo over contract · £732 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
150Mb Full Fibre CityFibre (24 Months)
150 Mbps upload · Full Fibre
Best for 2–3 person homes, 4K streaming
£18.50/mo
for 12 months, then £23.50/mo
Avg £21/mo over contract · £504 total over 24 months
Broadband providers in Castle, West Northamptonshire (NN1)
19 providers serve Castle, West Northamptonshire (NN1), with Sky the fastest at 5,000 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 Castle, West Northamptonshire (NN1) download speed at 123 Mbps.
Upgrade nudge
Room to upgrade in Castle, West Northamptonshire (NN1)
Only 17% of the 10,000 connections here are on 300Mbps or faster, even though 89% 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, West Northamptonshire (NN1) line runs 123 Mbps.
Working from home
OKStreaming and family use
GoodWhat speeds are people actually getting?
Gigabit reaches 89% of Castle, West Northamptonshire (NN1), and the fastest available is 1,000 Mbps. The full split by band is below.
Which broadband networks reach Castle, West Northamptonshire (NN1)?
The wholesale networks carrying Castle, West Northamptonshire (NN1) broadband, from Openreach to Virgin Media and the altnets, read off the live deals.
These are the alternatives to Openreach in Castle, West Northamptonshire (NN1): smaller infrastructure firms that have laid their own fibre. The pricing pressure they create is good news on a Saturday morning bill review.
- CityFibre: Sky, TalkTalk, The One Broadband, Vodafone, Zen Internet
- 4th Utility: 4th Utility, Rise Fibre
On top of the altnets, Openreach and Virgin Media O2 also serve Castle, West Northamptonshire (NN1) (Openreach is everywhere in the UK by default).
There are 19 providers on the live deal list for Castle, West Northamptonshire (NN1).
What broadband coverage does Castle, West Northamptonshire (NN1) have?
Superfast broadband reaches 98% of Castle, West Northamptonshire (NN1) premises but gigabit only 89%, so around 9% of homes can get fast broadband but not the fastest.
Can I rely on mobile broadband in Castle, West Northamptonshire (NN1)?
Outdoor 5G reaches 100% of Castle, West Northamptonshire (NN1) homes. Here is how mobile holds up if the line drops.
5G & 4G home broadband
Outdoor 5G covers 100% of Castle, West Northamptonshire (NN1), enough for a 5G home-broadband hub to stand in for a fixed line.
How Castle, West Northamptonshire (NN1) compares within West Northamptonshire
Across 12 postcode districts in West Northamptonshire, 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, West Northamptonshire (NN1)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.