What a leased line is
A leased line is a dedicated business internet connection between your premises and the provider network. Unlike standard broadband, the connection is not shared in the same way with neighbouring users, so it is often chosen where consistent performance matters. Leased lines are commonly used by offices, warehouses, care groups, professional services firms, call-heavy teams and multi-site businesses that depend on cloud systems, VoIP, remote access and large data transfers.
Dedicated versus contended connectivity
Most business broadband services are contended, meaning capacity is shared across the wider access network. A leased line is designed as dedicated connectivity for one business site, which can make performance more predictable. This does not mean every possible issue disappears, but it does give the business a different class of service to standard broadband. The choice comes down to how much the business depends on the connection and what downtime or poor performance would cost operationally.
Symmetrical speeds
Leased lines are usually symmetrical, which means upload and download speeds can be the same. This is useful for businesses that send large files, run cloud backups, host video meetings, use VoIP heavily, support remote workers or move data between sites. Standard broadband often has a much lower upload speed than download speed, so headline download figures alone do not tell the full story. If upload performance is important, leased line options may be worth reviewing.
Bearer size versus committed bandwidth
The bearer is the maximum capacity of the circuit, while committed bandwidth is the speed you initially buy on that bearer. For example, a business may choose a larger bearer so there is room to increase bandwidth later, subject to supplier terms and network capability. This can help growing businesses avoid a full new installation when their usage increases. When comparing leased line quotes, check both the committed speed and bearer size so the options are genuinely comparable.
Typical business use cases
Leased lines are often considered for larger offices, warehouses, professional services firms, healthcare settings, care groups, hospitality groups, call centres and multi-site organisations. Common use cases include hosted VoIP, cloud software, remote desktops, file transfer, video conferencing, payment systems, CCTV remote access, guest Wi-Fi and centralised systems shared by several locations. The stronger the reliance on cloud and voice services, the more important connectivity performance becomes.
Factors affecting leased line pricing
Leased line pricing can be affected by postcode, available network infrastructure, chosen bandwidth, bearer size, contract length, router requirements, resilience, installation complexity and support requirements. A site close to existing fibre infrastructure may be simpler to connect than a site needing additional construction work. A quote should be checked for what is included, what is subject to survey and whether backup, managed routers or enhanced support are part of the package.
Site surveys and excess construction charges
A leased line order may need a site survey to confirm the route, access requirements, landlord permissions, wayleaves and any construction work needed. Some installations can proceed without major issues, while others may involve excess construction charges if additional work is required. These charges should not be assumed either way before the supplier has completed the relevant checks. Businesses should ask when survey results will be confirmed and what happens if unexpected costs are identified.
Typical installation stages
A leased line installation commonly involves order validation, survey, route planning, any required permissions, external works, internal installation, circuit delivery, router setup and testing. The exact stages and timescales vary by location, network and supplier process. Businesses should avoid planning a critical go-live date without confirmation from the provider. If the connection is needed for a move or major project, allow time for surveys, permissions and contingency planning.
Service level agreements
A service level agreement, often called an SLA, sets out support expectations such as fault response and target repair commitments. Leased lines are usually chosen partly because they can offer stronger service levels than standard broadband. It is still important to read the details, including how faults are reported, what is covered, whether the router is managed and what service credits or remedies apply. A headline SLA should be compared alongside real operational needs.
Backup and failover
Even with a leased line, businesses may still consider backup connectivity. A second circuit, business broadband backup or 4G/5G failover can help keep essential systems online if the primary connection is affected. The right backup depends on how critical the site is, whether VoIP phones must keep working, how many users need continuity and whether cloud systems can run on a lower-speed backup. Failover should be tested rather than assumed.
Leased lines versus FTTP
FTTP business broadband can be a strong option where full fibre is available, but it is not the same as a leased line. FTTP is typically a broadband product with different service levels and contention characteristics, while a leased line is a dedicated business circuit with symmetrical speeds and stronger support expectations. Some businesses choose FTTP because it is suitable for their risk level, while others choose leased lines where uptime, upload speed and performance consistency are more important.
Leased lines for multi-site businesses
Multi-site businesses often need consistent connectivity across branches, warehouses, offices or care locations. A leased line may be used at a head office or key site, while other locations use business broadband, FTTP or backup services depending on need. When comparing options, consider centralised systems, VoIP routing, VPNs, guest Wi-Fi, CCTV viewing and whether sites need to communicate with each other. A mixed connectivity approach can sometimes make more sense than using the same product everywhere.
Questions to ask providers
Useful questions include: what bearer size is included, what committed bandwidth is quoted, whether installation is subject to survey, whether excess construction charges could apply, what router is included, what the SLA covers, how faults are reported, what backup options are available, what happens at renewal and whether the quote includes all sites and services needed. Asking these questions helps avoid comparing one incomplete quote against a more complete one.
How Business Comms Compare can help
Business Comms Compare helps collect the details suppliers need, including postcode, sites, users, contract position and key requirements. We then help review selected leased line service options and explain what to look for in the quotes provided. We compare selected suppliers and service options only, so the aim is practical clarity rather than a whole-market claim.