Leased line vs fibre broadband business guide
What to know before comparing connections
- A leased line usually provides dedicated, symmetrical connectivity with contractual service commitments; full-fibre broadband generally uses shared access infrastructure.
- Full-fibre broadband can suit demanding workplaces, but download speed alone does not tell you whether a service fits your business.
- Compare upload performance, support, fault handling, installation requirements and the full contract cost.
- Neither connection removes the need for backup connectivity, secure equipment and a well-designed office network.
Start with what your business needs to keep running
Choosing between a leased line and full-fibre broadband is less about buying the most impressive specification and more about understanding what happens when connectivity slows or stops. A business using cloud phones, shared files and online booking systems may have different needs from one that mainly uses email and occasional video calls.
This Energy Saving Guru guide explains the practical differences for UK business owners comparing services. Start by listing the systems that rely on your connection, when demand peaks and whether staff could continue working during an outage. Use those answers to judge proposals rather than treating the headline speed as the deciding factor.
What is the difference between a leased line and full fibre?
Full-fibre broadband, commonly called fibre to the premises or FTTP, brings fibre directly to your premises rather than using copper for the final connection. Standard FTTP services generally share parts of the access network with other customers. Providers manage capacity, but the performance and contractual commitments depend on the product.
An internet leased line usually provides dedicated access capacity between your premises and the provider’s network. It commonly offers symmetrical speeds, meaning upload and download capacity are matched, alongside a service-level agreement covering defined aspects of performance and fault handling.
Both services may use fibre cables. The important distinction is how capacity is delivered and supported, not simply whether the word ‘fibre’ appears in the name. A dedicated access circuit also does not make the entire internet dedicated to your business: external websites, cloud platforms and onward networks can still affect performance.
Compare uploads and responsiveness, not just downloads
Downloads matter when staff open cloud documents, receive files or access online systems. Uploads matter for cloud backups, sending large files, remote access and video meetings. Some full-fibre products offer lower upload capacity than download capacity, while others are symmetrical. Ask for both specifications.
Latency is the delay as data travels across a connection. Jitter describes variation in that delay, while packet loss means data fails to arrive. These can affect calls, video and interactive applications even when the advertised bandwidth looks ample.
Before upgrading, investigate local problems. Weak Wi-Fi coverage, ageing routers, unsuitable cabling or an overloaded firewall can make a capable connection feel slow. Test from a wired device where possible and ask your IT support provider to identify whether the bottleneck is inside the building or beyond it.
When full-fibre broadband may be a suitable choice
Business FTTP can be a sensible option where everyday cloud applications, browsing, calls and file transfers are the main requirements. It may also suit busy workplaces if the available upload capacity, support package and backup arrangements match their needs.
Look beyond the label ‘business broadband’. Packages differ in technical support, router management, static IP availability and fault escalation. Check whether the provider supports the way you work, especially if your busiest trading periods fall outside normal office hours.
Ask whether the service uses carrier-grade network address translation, which can complicate some inbound connections. If you host services, use particular remote-access arrangements or need a fixed public IP address, have your IT adviser confirm compatibility before ordering.
When a leased line deserves closer consideration
A leased line may merit consideration when predictable upload capacity and clearly defined service commitments are central to operations. Examples include organisations transferring large media files, running substantial remote-access workloads or supporting many simultaneous cloud calls.
The business case should reflect disruption as well as usage. If losing connectivity would stop dispatch, interrupt customer service or prevent access to essential systems, stronger support arrangements may carry real value. That does not mean every business with critical systems needs a leased line; suitable FTTP with effective backup may also meet its requirements.
Read the service-level agreement carefully. Check what is measured, how faults must be reported, when support operates, which exclusions apply and what remedies are available. A repair target is not a certainty, and service credits may not cover the wider consequences of an outage.
Build resilience around either connection
Neither option is immune to cable damage, equipment failure or power loss. A second connection can help, but two services may share the same duct, building entry point or underlying network. Ask providers about physical route diversity rather than assuming different supplier names mean separate infrastructure.
Mobile backup can offer an alternative access route, subject to coverage, capacity and equipment compatibility. Test it inside the premises during realistic working conditions. Check whether essential applications still function when the public IP address changes and whether calls or payment sessions need restarting.
Plan power protection for the router, fibre termination equipment, firewall and relevant network switches. Configure backup capacity to prioritise essential systems rather than guest Wi-Fi or large software downloads. Practise failover and recovery so staff know what to expect.
Compare installation and whole-contract costs
Leased lines typically involve a greater financial commitment than standard business FTTP, but proposals vary by location and specification. Compare recurring charges alongside installation, equipment, managed support, backup connectivity and any additional network work. Check how VAT and contractual price changes are presented.
Availability is address-specific. A nearby fibre network does not establish that your unit can be connected without further work. Leased line delivery may require a survey, construction, landlord consent or wayleave arrangements. FTTP installation can also face access and building constraints.
Ask who pays if extra work is needed, when those costs become binding and whether you can decline a revised proposal. Review the minimum term, renewal process, notice requirements, early termination charges and relocation provisions. Check current details in the provider’s official documentation and use official Ofcom guidance for applicable communications rules.
How to make a practical shortlist
- Write a requirements brief
Record essential applications, peak usage, upload needs, support hours and the work that must continue during an outage. Include planned changes such as extra premises or greater cloud use.
- Request comparable proposals
Give each supplier the same brief. Request written details covering capacity, service commitments, equipment, installation dependencies, contract charges and backup options.
- Check the delivery plan
Confirm site access, landlord permissions and responsibility for internal cabling. Keep your existing connection available until the replacement is installed and tested, allowing for any overlapping charges.
- Test before relying on the service
Check calls, payments, remote access, uploads and failover under representative conditions. Confirm escalation contacts and document who manages the router, firewall and provider relationship.