21 providers offer 226 broadband deals in Caerphilly, from £15.00 a month and up to 7,000 Mbps. Typical measured speed is 66 Mbps down and 18 Mbps up, 35% below the UK download average.
Best value broadband deal in Caerphilly
The best value in Caerphilly 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 Caerphilly
£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 Caerphilly
The fastest deal available in Caerphilly is You 8000 from YouFibre at 7,000 Mbps. Next fastest is Gig2 Fibre broadband + Netflix from Virgin Media O2 at 2,000 Mbps.
Fastest in Caerphilly
£99/mo
No rises, no surprises.
£1188 total over 12 months
Runner-up on speed
Gig2 Fibre broadband + Netflix
200 Mbps upload · Hybrid Fibre-Coaxial
Best for power users & big households
£51.99/mo
rises to £55.99 in April 2027 (+£4)
Avg £54.99/mo over contract · £1320 total over 24 months
Cheapest broadband deal in Caerphilly
The cheapest deal in Caerphilly is Fast 24m from giffgaff at £5.00 a month for 200 Mbps. It's full fibre, so the advertised speed is the speed that reaches the router. The £5.00 is an intro price that rises to £25.00 a month after the intro window, making the real first-year cost £180. Comfortably faster than the UK average.
Cheapest in Caerphilly
£5/mo
for 6 months, then £25/mo
Avg £20/mo over contract · £480 total over 24 months
Compare broadband deals in Caerphilly
£5/mo
for 6 months, then £28/mo
Avg £22.25/mo over contract · £534 total over 24 months
Full Fibre 1.6GB Premium
115 Mbps upload · Full Fibre
Best for power users & big households
£33.99/mo
rises to £37.99 in March 2027 (+£4)
Avg £37.32/mo over contract · £896 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
Onestream Fibre 55
10 Mbps upload · Hybrid Fibre
Best for small homes, single 4K streamer
£19.94/mo
rises to £22.69 in April 2027 (+£2.75)
Avg £22/mo over contract · £528 total over 24 months
Broadband providers in Caerphilly
21 providers serve Caerphilly, with YouFibre the fastest at 7,000 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 Caerphilly download speed at 66 Mbps.
Upgrade nudge
Room to upgrade in Caerphilly
Only 6% of the 48,000 connections here are on 300Mbps or faster, even though 84% 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 Caerphilly line runs 66 Mbps.
Working from home
OKStreaming and family use
OKWhat speeds are people actually getting?
Gigabit reaches 84% of Caerphilly, and the fastest available is 1,000 Mbps. The full split by band is below.
Which broadband networks reach Caerphilly?
The wholesale networks carrying Caerphilly broadband, from Openreach to Virgin Media and the altnets, read off the live deals.
Working altnets in Caerphilly, 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
Add to the list Openreach and Virgin Media O2 (Openreach is the country-wide baseline, so it's a given).
21 providers are live with broadband deals in Caerphilly.
What broadband coverage does Caerphilly have?
Superfast broadband reaches 97% of Caerphilly premises but gigabit only 84%, so around 13% of homes can get fast broadband but not the fastest.
Can I rely on mobile broadband in Caerphilly?
Outdoor 5G reaches 100% of Caerphilly homes. Here is how mobile holds up if the line drops.
5G & 4G home broadband
Outdoor 5G covers 100% of Caerphilly, enough for a 5G home-broadband hub to stand in for a fixed line.
Broadband speeds by Caerphilly neighbourhood
Measured speeds range from 75 Mbps in Penyrheol to 52 Mbps in New Tredegar, so your street matters more than the Caerphilly average.
| Neighbourhood | Median | vs area | Upload | Superfast | Gigabit | 5G |
|---|---|---|---|---|---|---|
| Penyrheol CF83 | 75 | +9 | 19 | 98% | 89% | 100% |
| Newbridge NP11 | 68 | +2 | 19 | 97% | 87% | 100% |
| Ystrad Mynach CF82 | 59 | -8 | 15 | 98% | 75% | 100% |
| Blackwood NP12 | 59 | -8 | 16 | 97% | 88% | 100% |
| Aberbargoed and Bargoed CF81 | 57 | -9 | 15 | 99% | 76% | 100% |
| New Tredegar NP24 | 52 | -14 | 13 | 96% | 70% | 100% |
Measured Ofcom data per Caerphilly neighbourhood, ranked fastest first. Median and upload are in Mbps; vs area is the median difference from the Caerphilly average; superfast, gigabit and 5G are the % of premises covered. Swipe the table sideways for more columns.
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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 Caerphillycome 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.