The Ultimate Guide to CityFibre for UK Businesses

What is CityFibre and how does it work?

CityFibre is a wholesale full-fibre network operator. It builds and maintains the physical glass-fibre infrastructure reaching your building, then sells capacity to internet service providers (ISPs) rather than to end customers. When your ISP delivers service "over CityFibre", it is leasing capacity on CityFibre's ducts and cables.

The company was founded in 2011 and has grown into the UK's largest alternative full-fibre network to Openreach. Its footprint prioritises cities and large towns where commercial demand justifies the civil-engineering cost. If your business sits in a CityFibre city, your ISP may already have access — or be planning it. Ofcom tracks this wider full-fibre rollout in its Connected Nations reporting, which shows full-fibre coverage climbing sharply across UK premises.

This wholesale model matters because it gives you choice. Several ISPs compete to sell the same underlying CityFibre line, so the network you sit on and the provider you buy from are two separate decisions. That is the same principle behind comparing business broadband options across every network available at your address.

Where does CityFibre operate in the UK?

CityFibre's network is active or under build in over 285 UK locations as of 2025. Coverage is concentrated in cities and large towns, and it is built area by area — so neighbouring streets in the same city can have different availability on any given day.

Major cities with established or expanding CityFibre coverage include:

• Glasgow, Edinburgh, and Aberdeen
• Manchester, Leeds, Bradford, and Sheffield
• Birmingham, Coventry, and Wolverhampton
• Bristol, Exeter, and Plymouth
• Cardiff and Newport
• Milton Keynes, Peterborough, and Norwich
• Multiple London boroughs

Because the build is progressive, the only reliable way to know your status is a live postcode check against current CityFibre build data. The government's Project Gigabit programme is separately subsidising gigabit-capable rollout in harder-to-reach areas, which is widening coverage further each year.

What CityFibre products are available for business?

CityFibre supports three broad product families for business: full-fibre (FTTP) broadband, dedicated Ethernet leased lines, and gigabit symmetrical services. Which one fits depends on whether you need a low-cost shared connection or a guaranteed, uncontended circuit with a service-level agreement.

Full-fibre broadband (FTTP)

For smaller offices, CityFibre-delivered FTTP broadband provides speeds from 100Mbps to 1Gbps. Unlike FTTC (fibre to the cabinet), CityFibre runs fibre all the way to the premises — there is no copper final mile to throttle speed or degrade signal over distance. Typical business FTTP pricing on CityFibre infrastructure runs from £35 per month, depending on speed and provider.

Ethernet and leased lines

For organisations needing dedicated, uncontended bandwidth with SLA protection, CityFibre also supports Ethernet leased line products. ISPs provision dedicated circuits over CityFibre's infrastructure in supported cities, often at competitive rates against Openreach circuits in the same area — typically from £69 per month for a 100Mbps dedicated circuit. If you are weighing this up, our explainer on what is a leased line breaks down the differences in plain English.

Gigabit and symmetrical services

CityFibre's Gigabit City programme is one of its flagship pushes. Businesses on covered streets can access genuine 1Gbps symmetrical or near-symmetrical services through participating ISPs. For bandwidth-heavy operations — media production, large-scale cloud backup, multi-site video — this tier removes the bandwidth ceiling entirely.

CityFibre vs Openreach: which network is better?

Both CityFibre and Openreach operate as wholesale networks, but they differ on coverage, network age, and provider choice. Openreach wins on national reach; CityFibre often wins on newer infrastructure and competitive city pricing. In streets where both exist, that competition is the business buyer's advantage.

CityFibre builds new infrastructure rather than upgrading copper, so in dual-network areas its network is usually engineered for higher capacity from the outset. Openreach, by contrast, supports the broadest ISP ecosystem and reaches places CityFibre does not. For most urban businesses the right answer is to quote both — which is exactly what comparing across business leased lines providers achieves.

How do you get connected to CityFibre?

You do not buy from CityFibre directly. You order a CityFibre-delivered product through an ISP, choose your speed and term, and an engineer completes the fibre installation. In covered areas, business installs typically land within 10–20 working days of order.

The process in practice:

1. Check your postcode for CityFibre availability using an ISP or broker checker. 2. Choose an ISP that offers CityFibre-delivered products at your address. 3. Select your speed tier and contract term (commonly 24 or 36 months for business). 4. An engineer attends to complete the fibre installation, usually within 10–20 working days.

AMVIA checks CityFibre availability at your postcode alongside Openreach and Virgin Media infrastructure at the same time, so you see what is genuinely available before committing. If you need a guaranteed circuit, our FTTP leased line and dedicated internet access pages cover the SLA-backed options in detail.

Is CityFibre right for your business?

If your premises sits within a CityFibre coverage area, it belongs in your comparison. The infrastructure quality matches Openreach's newer FTTP builds, and competition between the two networks in the same street often means better pricing and faster installs than a single-provider area delivers.

For businesses still on FTTC broadband inside a CityFibre zone, upgrading to FTTP is one of the most cost-effective ways to materially improve connection quality and future-proof the line against rising bandwidth demand. The practitioner's rule: never assume one network. Quote every option at your exact address, then decide on price, speed, and install date together.