17 providers offer 190 broadband deals in Treharris, from £20.00 a month and up to 7,000 Mbps. Typical measured speed is 64 Mbps down and 14 Mbps up, 37% below the UK download average.
Best value broadband deal in Treharris, Merthyr Tydfil (CF46)
The best value in Treharris, Merthyr Tydfil (CF46) 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 Treharris, Merthyr Tydfil (CF46)
£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 Treharris, Merthyr Tydfil (CF46)
The fastest deal available in Treharris, Merthyr Tydfil (CF46) is You 8000 from YouFibre at 7,000 Mbps.
Fastest in Treharris, Merthyr Tydfil (CF46)
£99/mo
No rises, no surprises.
£1188 total over 12 months
Cheapest broadband deal in Treharris, Merthyr Tydfil (CF46)
The cheapest deal in Treharris, Merthyr Tydfil (CF46) is 300Mb Full Fibre (24 Months) from 4th Utility at £20.00 a month for 300 Mbps. It's full fibre, so the advertised speed is the speed that reaches the router. The £20.00 is an intro price that rises to £40.00 a month after the intro window, making the real first-year cost £240. Onestream is essentially level at £20.63 a month.
Cheapest in Treharris, Merthyr Tydfil (CF46)
300Mb Full Fibre (24 Months)
300 Mbps upload · Full Fibre
Best for 4–5 person households, heavy use
£20/mo
for 12 months, then £40/mo
Avg £30/mo over contract · £720 total over 24 months
Runner-up on price
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
Compare broadband deals in Treharris, Merthyr Tydfil (CF46)
£21/mo
rises to £24 in April 2027 (+£3)
Avg £23.25/mo over contract · £558 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 Treharris, Merthyr Tydfil (CF46)
17 providers serve Treharris, Merthyr Tydfil (CF46), 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 Treharris, Merthyr Tydfil (CF46) download speed at 64 Mbps.
Upgrade nudge
You could be getting more.
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 Treharris, Merthyr Tydfil (CF46) line runs 64 Mbps.
Working from home
OKStreaming and family use
OKWhat speeds are people actually getting?
Gigabit reaches 46% of Treharris, Merthyr Tydfil (CF46), and the fastest available is 1,000 Mbps. The full split by band is below.
Which broadband networks reach Treharris, Merthyr Tydfil (CF46)?
The wholesale networks carrying Treharris, Merthyr Tydfil (CF46) broadband, from Openreach to Virgin Media and the altnets, read off the live deals.
Altnets reaching Treharris, Merthyr Tydfil (CF46): the full-fibre networks that compete with Openreach. Where they reach, they're usually the cheapest gigabit option.
- CityFibre: Sky, The One Broadband, Vodafone
- 4th Utility: 4th Utility, Rise Fibre
- Netomnia: YouFibre
Alongside those, Openreach reach addresses here too (Openreach has a nationwide footprint, so it'll be available).
Across the area, 17 providers are listing live deals.
What broadband coverage does Treharris, Merthyr Tydfil (CF46) have?
Superfast broadband reaches 96% of Treharris, Merthyr Tydfil (CF46) premises but gigabit only 46%, so around 50% of homes can get fast broadband but not the fastest.
Can I rely on mobile broadband in Treharris, Merthyr Tydfil (CF46)?
Outdoor 5G reaches 99% of Treharris, Merthyr Tydfil (CF46) homes. Here is how mobile holds up if the line drops.
5G & 4G home broadband
Outdoor 5G covers 99% of Treharris, Merthyr Tydfil (CF46), enough for a 5G home-broadband hub to stand in for a fixed line.
How Treharris, Merthyr Tydfil (CF46) compares within Merthyr Tydfil
Across 3 postcode districts in Merthyr Tydfil, 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 Treharris, Merthyr Tydfil (CF46)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.