Inside the UK’s Full Fibre Broadband Market

The UK’s full fibre rollout has reached a turning point.

For much of the past decade, the broadband industry has been focused on building fibre as quickly as possible.

Openreach, CityFibre, Virgin Media and dozens of smaller alternative networks have invested billions of pounds replacing or competing with older infrastructure.

That build continues, but the market is changing. Increasingly, the challenge is no longer simply getting fibre into an area. It is getting customers to actually use it.

As of January 2026, full fibre broadband was available to 24.9 million UK homes, equivalent to 82% of residential premises. Yet across residential and commercial premises, only 47% of properties where full fibre was available had an active full fibre connection.

Britain has spent years building fibre networks. The next phase will increasingly be about competing for the customers connected to them.

The UK Has More Than One Fibre Network

One of the more interesting aspects of the UK broadband market is the number of companies building competing infrastructure.

Openreach remains at the centre of the market. Rather than selling broadband directly to consumers, it operates a wholesale network used by providers including BT, EE, Sky, Plusnet, TalkTalk and Vodafone.

This creates an important distinction between the network and the broadband provider. Two households can buy broadband from different companies while their connections ultimately run over the same underlying fibre network.

Openreach says its network supports more than 650 communications providers nationwide.

But Openreach isn’t the only major fibre network competing for UK homes.

CityFibre Has Created a Second Major Wholesale Network

CityFibre has emerged as the UK’s largest independent full fibre platform, providing another wholesale network over which broadband providers can sell their services.

By June 2026, its network reached nearly five million premises, and the company had passed one million connected homes and businesses.

For consumers, this means the brand selling their broadband and the company operating the fibre underneath it can be two different businesses.

For networks such as CityFibre, however, simply running fibre past millions of properties isn’t enough. They also need providers selling services over those connections and customers willing to switch.

Then There Are the Altnets

Alongside the largest networks is a collection of alternative network operators, usually shortened to altnets.

Companies such as Hyperoptic and Community Fibre have built their own full fibre infrastructure in selected parts of the country. Some altnets both operate the physical network and sell broadband directly to consumers.

More than 100 operators have been involved in building alternative networks, according to Ofcom, although consolidation is increasingly expected as operators look for greater scale.

The result is a broadband market where some properties may have several fibre networks competing for their business, while others still have considerably less choice.

Building Fibre Is Only Half the Battle

Passing a property with fibre is not the same as having a paying customer.

A network operator can spend money digging streets, installing ducts and running fibre past thousands of properties, but that investment only starts producing returns when households and businesses connect.

With full fibre take-up at 47% of premises where it was available in January 2026, there remains a substantial gap between coverage and adoption.

That changes the competitive dynamic.

During the earlier stages of the rollout, gaining an advantage often meant being the first fibre network into an area. As networks increasingly overlap, operators and broadband providers have to convince customers to choose their connection instead.

The UK is gradually moving from a network-building race to a customer-acquisition race.

More Competition Means More Broadband Deals

This is where the structure of the market becomes particularly interesting for consumers.

When several providers sell similar speed tiers over the same wholesale network, the connection itself may not give one ISP much of an advantage over another.

Instead, providers compete through introductory prices, reward cards, bill credits, waived setup fees, discounted periods and benefits for existing customers.

A £100 reward card might therefore be more than a nice extra attached to a broadband package. It is part of the competition between providers trying to acquire customers who may have several similar services to choose from.

The wholesale structure also helps explain why competing broadband packages can sometimes look remarkably similar. Providers using the same infrastructure operate with some of the same underlying wholesale economics, even though they control their own retail pricing and promotions.

This makes the complete deal increasingly important.

A £28 package isn’t necessarily better value than one costing £30. If the more expensive package includes a sizeable reward, lower setup costs or different contractual price increases, the overall calculation can change considerably.

Full Fibre Speeds Are Moving Up Too

Competition isn’t happening only on price.

The capabilities of fibre networks continue to increase. CityFibre launched wholesale speeds of up to 8.5Gbps in 2026, while Openreach has begun expanding XGS-PON technology capable of supporting much faster services over its network.

That doesn’t mean every household suddenly needs multi-gigabit broadband. But it illustrates where the infrastructure is heading.

Once fibre is installed, network upgrades can support new speed tiers without replacing the entire physical connection into every property. This gives providers another way to differentiate their packages beyond price and promotions.

The Copper Network Is Moving Into the Background

At the same time, older copper-based broadband is becoming less central to the UK market.

Openreach has progressively introduced its stop-sell process in areas where full fibre reaches sufficient coverage. This restricts new sales of certain legacy copper-based products where newer digital services are available.

In May 2026, Openreach announced another 238 exchange locations covering 1.69 million premises where this transition would take place.

Copper broadband isn’t disappearing overnight, but the direction is clear: more properties are moving towards fibre and the commercial battle is increasingly taking place over newer networks.

What This Means for Broadband Customers

The UK’s fibre rollout still has further to go, but for a growing share of the country, the interesting question is becoming less about whether fibre exists and more about who gets the customer once it does.

Ofcom estimates that full fibre could reach 92% of UK homes by the end of 2028 if current deployment plans are delivered.

Greater network and provider competition should mean more choice, but it also makes broadband comparison more important.

Two providers may use the same network but offer different prices, contract lengths, rewards and setup costs. Another provider may reach the same property using an entirely different fibre network.

The important thing is to compare what is actually available at your address and look at the complete package rather than focusing on one headline number.

The UK’s full fibre build isn’t finished, but the market is already entering its next phase.

The race to build fibre is increasingly becoming a race to fill it.