19 providers offer 261 broadband deals in Harpenden, from £13.50 a month and up to 5,000 Mbps. Typical measured speed is 142 Mbps down and 25 Mbps up, 41% above the UK download average.
Best value broadband deal in Harpenden, St Albans (AL5)
The best value in Harpenden, St Albans (AL5) 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 Harpenden, St Albans (AL5)
£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 Harpenden, St Albans (AL5)
The fastest deal available in Harpenden, St Albans (AL5) is Full Fibre 5 Gigafast+ from Sky at 5,000 Mbps.
Fastest in Harpenden, St Albans (AL5)
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 Harpenden, St Albans (AL5)
The cheapest deal in Harpenden, St Albans (AL5) 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 Harpenden, St Albans (AL5)
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 Harpenden, St Albans (AL5)
£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 Harpenden, St Albans (AL5)
19 providers serve Harpenden, St Albans (AL5), 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 Harpenden, St Albans (AL5) download speed at 142 Mbps.
Upgrade nudge
Room to upgrade in Harpenden, St Albans (AL5)
Only 23% of the 9,200 connections here are on 300Mbps or faster, even though 91% 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 Harpenden, St Albans (AL5) line runs 142 Mbps.
Working from home
OKStreaming and family use
GoodWhat speeds are people actually getting?
Gigabit reaches 91% of Harpenden, St Albans (AL5), and the fastest available is 1,000 Mbps. The full split by band is below.
Which broadband networks reach Harpenden, St Albans (AL5)?
The wholesale networks carrying Harpenden, St Albans (AL5) broadband, from Openreach to Virgin Media and the altnets, read off the live deals.
Working altnets in Harpenden, St Albans (AL5), listed by what their resellers are actually selling. Each footprint stops and starts a few doors apart, so address-checking matters more than usual.
- CityFibre: Sky, The One Broadband, Vodafone
- 4th Utility: 4th Utility, Rise Fibre
Behind the altnets, Openreach and Virgin Media O2 run as the major-network options (Openreach is the country-wide baseline, so it's a given).
Live count: 19 providers actively serving Harpenden, St Albans (AL5).
What broadband coverage does Harpenden, St Albans (AL5) have?
Superfast broadband reaches 98% of Harpenden, St Albans (AL5) premises but gigabit only 91%, so around 7% of homes can get fast broadband but not the fastest.
Can I rely on mobile broadband in Harpenden, St Albans (AL5)?
Outdoor 5G reaches 100% of Harpenden, St Albans (AL5) homes. Here is how mobile holds up if the line drops.
5G & 4G home broadband
Outdoor 5G covers 100% of Harpenden, St Albans (AL5), enough for a 5G home-broadband hub to stand in for a fixed line.
How Harpenden, St Albans (AL5) compares within St Albans
Across 5 postcode districts in St Albans, 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 Harpenden, St Albans (AL5)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.