ToolsBroadband speed test4th Utility
customersAre you actually getting 4th Utility speeds?
4th Utility broadband
speed test
A 4th Utility broadband speed test shows whether you get the speed you pay for: 4th Utility sells 9 speeds, from 50 Mbps to 2.3 Gbps, checked 28 October 2026. 4th Utility hasn't signed Ofcom's speed code, so compare a wired result with your package speed and report any shortfall to 4th Utility.
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4th Utility is a build-to-order altnet providing FTTP to large residential developments. We'll measure your line and grade the result against what they promised for your package.
What speed should your 4th Utility line show?
4th Utility sells 9 speeds today, from 50 Mbps to 2.3 Gbps, all of them full fibre, so the fibre runs all the way into your home.
| Package | Line | Download | Upload | Advertised from | Over 2 years |
|---|---|---|---|---|---|
| 50Mbps Full Fibre (24 Months) | Full fibre | 50 Mbps | 50 Mbps | £18/mo | £21.50/mo |
| 100Mbps Full Fibre (24 Months) | Full fibre | 100 Mbps | 100 Mbps | £18.50/mo | £18.50/mo |
| 150Mbps Full Fibre (24 Months) | Full fibre | 150 Mbps | 150 Mbps | £13.50/mo | £15.75/mo |
| 250Mb Full Fibre CityFibre (24 Months) | Full fibre | 250 Mbps | 250 Mbps | £16.50/mo | £19.25/mo |
| 300Mbps Full Fibre (24 Months) | Full fibre | 300 Mbps | 300 Mbps | £18.75/mo | £21.88/mo |
| 500Mb Full Fibre CityFibre (24 Months) | Full fibre | 500 Mbps | 500 Mbps | £18.75/mo | £21.88/mo |
| 900Mbps Full Fibre (24 Months) | Full fibre | 900 Mbps | 900 Mbps | £21/mo | £24.50/mo |
| 1Gb Full Fibre CityFibre (24 Months) | Full fibre | 1 Gbps | 1 Gbps | £19.50/mo | £22.75/mo |
| 2.3Gb Full Fibre CityFibre (24 Months) | Full fibre | 2.3 Gbps | 2.3 Gbps | £26.25/mo | £30.63/mo |
"Over 2 years" is the average monthly cost across 24 months once any intro offer ends and the rises written into the contract apply. Some advertised prices are intro offers that end after a set number of months. From 4th Utility's live deals, updated every day.
Getting a fair result
Run the test on a laptop plugged into the router with a cable. Over wifi you'll often see less than the line is giving you.
8 of 4th Utility's 32 deals have a price rise written into the contract. The rest have none published.
If it’s still slow
4th Utility hasn't signed Ofcom's voluntary broadband speed code, so there's no set 30-day right to leave over slow speeds. Report it to 4th Utility first. If it isn't sorted after six weeks, you can take it to the free dispute scheme 4th Utility belongs to.
4th Utility runs its own network and also sells over CityFibre in some areas. Who sends an engineer depends on which network reaches your home, and 4th Utility books them either way. Source
Questions
4th Utility speed questions
What speed should I get on 4th Utility?
4th Utility sells 9 speeds today, from 50 Mbps to 2.3 Gbps, all of them full fibre, so the fibre runs all the way into your home. Check which package you're on, then compare it with a wired test. The table on this page shows the speed each package is sold at.
Why is my 4th Utility broadband slow?
Run the test on a laptop plugged into the router with a cable. Over wifi you'll often see less than the line is giving you. If the wired result is fine, the line is doing its job and the slowdown is in your home: the router's position, other devices or an old wifi standard. If the wired result is low too, switch the router off at the wall for 30 seconds, test again, then report it.
What can I do if 4th Utility can't fix my speed?
4th Utility hasn't signed Ofcom's voluntary broadband speed code, so there's no set 30-day right to leave over slow speeds. Report it to 4th Utility first. If it isn't sorted after six weeks, you can take it to the free dispute scheme 4th Utility belongs to. 4th Utility runs its own network and also sells over CityFibre in some areas. Who sends an engineer depends on which network reaches your home, and 4th Utility books them either way.
Will my 4th Utility price go up?
8 of 4th Utility's 32 deals have a price rise written into the contract. The rest have none published.
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