Full fibre vs FTTC compared: speeds, upload, cost and reliability

FTTC uses fibre to the street cabinet and copper from the cabinet to your home. Full fibre, also called FTTP, uses fibre all the way to the premises. The difference can affect available speeds and installation, but the right choice still depends on the exact package and your address.

This is a straight head-to-head comparison of the two technologies, written for two audiences: UK households and small business owners or hybrid workers weighing connectivity against cost. Both are looking at the same two technologies, but the trade-offs differ once you go past the basics. We compare real-world speeds, upload and latency, weather and reliability, cost, the migration of FTTC attached to WLR phone lines, and how to check what you have. If your question is more "will I actually notice full fibre in daily use" than "what's the technical difference", our is full fibre worth it guide answers that directly.

FTTC has copper between the cabinet and your home; FTTP has fibre all the way. Check the exact upload and download tier. WLR-based FTTC must be migrated before its phone line is ceased, while standalone SOGEA does not depend on WLR.

Reviewed 1st October 2026

What FTTC actually is, and why the copper bit is the bottleneck

FTTC stands for fibre to the cabinet. Openreach (the engineering arm that owns most of the UK's broadband network) runs fibre from the local exchange to the green cabinet you walk past on your street. From that cabinet to your house, the signal travels down the same copper line that has carried your phone calls for decades.

FTTC performance depends on the length and condition of the copper line between the cabinet and the property, as well as interference and internal wiring. Two homes can have different available speeds. Use the provider's address-specific estimate rather than a distance-based rule of thumb.

Ask the provider whether the service is FTTC, SOGEA or FTTP. An ONT in the property can indicate an existing fibre installation, which may have been fitted for a previous occupier. The wording of an advert or whether you remember an engineer visit does not establish the connection type.

What full fibre (FTTP) is, and the no-copper claim

Full fibre, or FTTP (fibre to the premises), runs a single strand of glass fibre all the way from the exchange to a small box on the inside wall of your home, called an ONT (Optical Network Terminal). Your router plugs into the ONT. There's no copper involved at any stage. Your data travels as pulses of light through glass, which is why the engineering is so different.

FTTP removes the copper section whose performance can fall with distance from the cabinet. Actual service performance still depends on the purchased tier, network conditions and the equipment in your home.

This is the same technology behind business leased lines, though leased lines add dedicated bandwidth and a hard uptime SLA on top. The cable in the ground is fundamentally similar. If you want a deeper walkthrough of how full fibre works end to end, the what is full fibre guide covers install day, the PSTN switch-off, and coverage in more detail.

The speed difference, with actual numbers

Openreach FTTC-style services can offer up to 80 Mbps download and 20 Mbps upload, but the estimate for your property can be lower. Line length, condition, interference and internal wiring affect usable speed. Check the estimate on the exact offer.

Full fibre supports higher speed tiers than standard FTTC, but packages vary by network, provider and address. Entry-level FTTP does not automatically offer a higher upload than an existing FTTC service. Openreach explains the connection types; compare the available package figures for your home.

Usable speed at a device depends on Wi-Fi coverage, router and device capabilities, Ethernet ports and the service itself. A gigabit headline does not promise a particular wireless speed in every room. Test by Ethernet to separate the line performance from your home network.

A household's simultaneous activity determines the capacity it needs. Our family broadband guide offers practical planning examples, and our gigabit guide helps assess a larger tier.

Upload speeds and latency: compare the exact service

Upload speed matters for calls, cloud backups and sending files. Latency, jitter and packet loss also affect real-time activity. A healthy FTTC-style service can handle these tasks if there is enough usable capacity.

FTTC packages commonly have lower upload capacity than higher FTTP tiers, but full fibre is not automatically symmetric. Openreach-based FTTP packages can have different download and upload speeds, and some entry tiers have the same upload as an FTTC package. Compare the exact figures for your address. For calls and cloud backups, additional usable upload capacity can matter more than a larger download number.

Connection technology alone does not establish your ping or call quality. Network routing, Wi-Fi and the destination also matter. Compare a wired test with a wireless one and investigate recurring dropouts before assuming a speed upgrade will resolve them.

If you work from home, run a small business that depends on cloud tools, game competitively, or have a house full of smart devices, the upload and latency gap matters more than the headline download number.

Reliability: what changes when the copper section is removed?

Copper faults can be affected by line condition, water ingress or electrical interference. If a connection repeatedly drops or changes speed, record when it happens and report it to the provider so the cause can be investigated.

Full fibre removes the copper access section and its susceptibility to electrical interference. It can still suffer damaged cables, equipment faults, network outages and power interruptions. Check any service commitments in the contract rather than assuming a technology name guarantees uptime.

Recurring speed drops or disconnections need investigation. Moving to full fibre removes the copper section, but the fault may also involve the router or home network. Ask the provider to identify the cause.

Cost: headline price vs the price you actually pay

The assumption is that full fibre costs more. In 2026, total cost over a contract usually evens out, and sometimes the full fibre line works out lower over the contract. The reason is what happens after the headline price.

UK broadband pricing has two layers. The headline (the figure on the advert) and the actual monthly cost over the life of your contract. The big six providers raised consumer broadband prices by roughly £3 to £4 a month in their April 2026 annual review (multiple UK press reports), and most of them apply the same kind of rise every year. A line that looked like a £29 deal on day one can sit closer to £36 by the end of a two-year contract.

Inspire Telecom doesn't raise prices mid-contract. The monthly price you sign at is the monthly price you pay for the full term, with no annual review and no inflation-linked clause. Inspire's residential range runs from Inspire Ultra 80 (80 Mbps down, 20 Mbps up) up to Inspire Ultra 1000 (gigabit). Current pricing is on the broadband page and the line for each tier stays fixed for the contract length.

The honest comparison is total spend over the contract, not the first month. A fixed £35 a month over a typical two-year contract is £840. A headline £29 that rises annually can work out to £790 to £870 over the same period depending on the rises. The headline difference is smaller than it looks, and the predictability is worth more to a household budget than a sub-£30 starting price that drifts upward without notice.

What happens to WLR-based FTTC when the phone line is ceased?

A traditional FTTC connection can depend on a Wholesale Line Rental (WLR) analogue phone line. When that WLR line is ceased, the attached broadband is ceased too. Moving the phone number to a cloud phone service can trigger that cease, so the broadband migration and number port need to be coordinated. Openreach explains the withdrawal of WLR as part of the move to digital phone services, with BT Group retiring the PSTN by 31st January 2027.

The standalone alternative is SOGEA, Single Order Generic Ethernet Access. It uses an FTTC-style fibre-to-the-cabinet connection without relying on WLR. Full fibre (FTTP) is another migration option where available. An existing SOGEA connection does not rely on the analogue phone line being retained. These are different service arrangements, even though traditional FTTC and SOGEA both use copper for the final stretch.

Before porting a landline number or cancelling a WLR service, ask the provider which broadband product you have and how the replacement will be activated. If an alarm or care pendant uses the phone line, confirm compatibility and power-backup requirements as part of the migration. Avoid arranging a separate number port without checking its effect on the attached broadband.

How to check which one you currently have

You can usually tell at a glance. If your broadband runs through the same wall socket as your home phone (the master socket, often a small white box with a phone port and a broadband filter), you're almost certainly on FTTC or older ADSL. If you have a separate small white box on the inside wall labelled ONT, with a fibre cable running to it and a short Ethernet cable to your router, you have full fibre.

The router itself isn't a reliable indicator. Most providers ship the same router shape to FTTC and FTTP customers.

A postcode check confirms it in under a minute. Run your address through the Inspire availability checker on the broadband page and it will tell you which technologies your address can get today, including whether FTTP has arrived on your street. If FTTP is listed, you can switch to full fibre.

The verdict, by household and by business

For your home, compare your current download and upload speeds with the address-specific FTTP estimate and contract terms. If your broadband depends on WLR, plan its replacement before that phone line is ceased. SOGEA can be the standalone FTTC-style option; FTTP provides a fibre connection all the way to the premises. Check the current Inspire options for your address.

For small businesses and home workers, compare upload capacity, support availability, fault handling and any written repair commitments. FTTC-style broadband can support remote work, while higher FTTP tiers can provide more headroom. Our working-from-home guide explains the checks.

Mobile broadband can be an option where fixed-line choices are limited. Check indoor signal, usable speeds at busy times, data allowances and equipment requirements before relying on it. Performance varies by location and mobile-network conditions.

For a residential switch using One Touch Switch, contact the new provider so it can coordinate the transfer. Confirm the agreed date, any installation needs, early termination charges and the services affected. If a WLR phone line carries your FTTC, have the broadband migration and phone-number port coordinated. Our switching guide explains the practical steps.

Frequently asked questions