Fibrus vs BT: fixed price or the big-name extras

Fibrus and BT sell on different networks. Fibrus builds its own full fibre in Northern Ireland and Cumbria, where it is often the only full fibre alternative to Openreach. BT sells on Openreach's lines, which reach almost every address in both places. Where Fibrus has built, the choice is a price that stays put for 18 months against BT's reward cards, speed guarantee, landline and TV.

How do Fibrus and BT compare at a glance?

The table takes prices, speeds, contract lengths, rewards and scheduled price rises from our live deal feed, so it matches the deals on our comparison pages today. The network, guarantee and exit-fee rows come from each provider's own pages, checked on 11 October 2026.

Is Fibrus cheaper than BT?

Tier for tier, yes when we checked on 11 October 2026. Fibrus Full Fibre 150 was £19.99 a month on an 18-month contract, fixed for the term. BT's Full Fibre 150 was £23.99 a month on 24 months, rising to £27.99 on 31 March 2027 and £31.99 on 31 March 2028, with a £90 reward card. At the top of Fibrus's range, Full Fibre 1000 was £29.99 against BT Full Fibre 900 at £32.99 rising to £40.99, with a £175 reward card.

The terms differ, so compare the schedules rather than the totals. Fibrus's £19.99 stays £19.99 for all 18 months. BT's £23.99 becomes £27.99 after the first 31 March in the contract and £31.99 after the second, so BT costs £4 a month more at the start and up to £12 a month more by the end. BT's £90 reward card offsets part of that gap; the live table shows both schedules.

Both sets of prices are online offers and they change, so treat these as a snapshot and read the live table.

What about speed, upload and Wi-Fi?

Fibrus's three tiers upload faster than BT's at each speed, though not as fast as they download. BT also sells part-fibre deals where full fibre hasn't been built, which Fibrus doesn't.

Wi-Fi is where Fibrus pushes hardest. Every deal comes with an Amazon eero Wi-Fi 6 router, and Full Fibre 500 and above include two eero units with what Fibrus calls a Total Home Wi-Fi Guarantee: "Fast and reliable Wi-Fi in every room". BT's equivalent is Complete Wi-Fi, an add-on with up to three discs and a one-off £100 bill credit if it still can't cover the home, according to its broadband page.

Can the price go up during the contract?

No with Fibrus, yes with BT. Fibrus's broadband page says: "your monthly price stays the same for the full length of your contract ... No mid-contract price hikes." All three Fibrus deals in our feed are flagged fixed price. BT raises broadband by £4 a month on 31 March each year during the contract, for products bought on or after 10 April 2024, according to its price-change page. On Full Fibre 150 that is £23.99, then £27.99, then £31.99, as the table shows.

That is £4 a month more after the first rise and £8 a month more after the second. Because BT sets the amount and dates out in the contract, Ofcom's rules don't give you a penalty-free exit when the rise lands. Our price rise guide explains how that works.

Who pays your exit fee?

Both offer something, but in different shapes. Fibrus's Contract Buy Out pays up to £400 towards your old provider's exit fee, or £100 in certain Northern Ireland postcodes, according to its Get Fibrus page. You send the final bill within 40 days, in the same name and at the same address as your Fibrus order. BT's reward cards run from £70 to £175 on most deals in our feed, plus "Claim up to £200 switching credit" towards leaving fees.

If you're mid-contract with BT, our exit fee calculator estimates what you'd owe, so you can see whether Fibrus's buy-out would cover it.

Which one guarantees your speed and compensates you?

BT is a signatory to Ofcom's Broadband Speeds Code. That gives you a personalised minimum speed when you order and a right to leave without penalty if BT can't fix a shortfall within 30 days. Its Stay Fast Guarantee adds a £20 reward card for each failed fix, up to four times a year. BT is also in Ofcom's automatic compensation scheme, which pays set amounts for missed appointments, delayed repairs and late starts.

Fibrus is neither a Code signatory nor a member of the compensation scheme, according to Ofcom's lists. Its published promise is the Total Home Wi-Fi Guarantee on Full Fibre 500 and above, which is about coverage in every room rather than a minimum line speed. If a formal minimum speed and automatic compensation matter to you, BT has both in writing.

Do you want a landline or TV?

BT does both. The "+Pay As You Go" version of each full fibre tier adds a landline for about £5 a month more in our feed. TV comes as EE TV bundles from £38.99 a month with Netflix included when we checked. Our EE TV channels guide covers what's in each tier.

Fibrus sells broadband only in our feed. It launched a pay TV service in September 2026, which ISPreview reported at £7.99 a month, but it isn't bundled with the broadband deals we list. If you still use a home phone, that decides it for BT, unless you're happy to add an internet phone provider alongside Fibrus.

How do their service records compare?

Ofcom's complaints figures for January to March 2026 put BT at 7 complaints per 100,000 broadband customers, against an industry average of 6. Ofcom does not report complaints for providers of Fibrus's size, so there is no like-for-like figure. Both appear in the Trustpilot row of the table above, with the caveat that sits under it. Our complaints rankings guide explains how to read Ofcom's figures.

What does it cost to leave early?

BT's method is published in its Consumer Price Guide, effective 25 September 2026. It starts from the price without VAT, takes off the costs it saves (£15 a month in its own example), discounts by 1% for early payment and adds VAT back. Its example is £35 a month with four months left, which comes to £67.32. On Full Fibre 150 at £23.99 with four months left, the same method comes to about £24. Our exit fee calculator has BT's rule built in.

Fibrus's terms describe the fee as the monthly rental for the months left of your minimum period. We couldn't read the full terms document with our tools, so confirm the figure with Fibrus before you rely on it. On an 18-month term the exposure is shorter in any case.

Where can you get both?

BT is available at almost every UK address through Openreach, so the question is where Fibrus has built. In Northern Ireland its network covers the rural areas built under Project Stratum, the government contract ISPreview reported as completed in August 2025, plus parts of towns including Belfast. In Cumbria it is building under Project Gigabit around Penrith, Kendal, Workington and Whitehaven.

Our area pages for Belfast, Derry and Northern Ireland list Fibrus alongside BT, and the Carlisle page lists it for the villages around the city. Its postcode checker is the final word, because the network stops at the edge of each build.

Why you might choose Fibrus

• You want a price that can't change, on an 18-month term rather than 24.
• You want whole-home Wi-Fi included, with two eero units on Full Fibre 500 and above.
• You're mid-contract elsewhere and its buy-out of up to £400 would cover your exit fee.
• You upload a lot and want 104Mbps or 310Mbps up rather than BT's 49Mbps or 110Mbps.
• You don't need a landline or TV with your broadband.

Why you might choose BT

• You want a landline, EE TV or a reward card, worth up to £175 on the deals we checked.
• You want Ofcom's Speeds Code protections: a minimum speed in writing and a right to leave if it isn't met.
• You want automatic compensation for missed appointments and slow repairs.
• You might need to leave early and want a published method with a deduction for the provider's saved costs.
• Fibrus hasn't reached your address, which is true across most of Northern Ireland's towns and all of Great Britain outside Cumbria.

How do you switch between them?

The two networks are separate, so a switch means a new connection is installed rather than your existing line changing hands. Fibrus supports One Touch Switch. Its switching page says "You don't need to contact your current provider", that it works from BT, Sky or Virgin Media, and that an engineer visit may be needed depending on your current network. The one case it rules out is a house move. Under Ofcom's rules you shouldn't be without broadband for more than one working day. Our One Touch Switch guide has the steps.

Going the other way, BT handles the switch from Fibrus in the same way. If you're mid-contract, the exit fee applies to whichever provider you leave. Fibrus's buy-out can cover up to £400 of BT's fee, and BT's switching credit up to £200 of Fibrus's, on the terms we checked.

Sources and how we checked

Prices, speeds, contract lengths, rewards and scheduled rises come from our live deal feed, checked on 11 October 2026 and refreshed whenever the site updates. The rest comes from the sources below, read on the dates shown.

• Fibrus, read 11 October 2026: broadband, Get Fibrus and One Touch Switch pages.
• BT, read 10 October 2026: price change page, broadband page, terms and the Consumer Price Guide effective 25 September 2026 at bt.com/tariffguide.
• Ofcom: telecoms complaints data for January to March 2026, and its codes of practice and automatic compensation pages for Speeds Code and automatic compensation membership.
• ISPreview: Project Stratum and Fibrus's TV launch.

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