How Long Does a Leased Line Take to Install?

*Last updated: March 2026*

The single biggest mistake UK businesses make with connectivity is treating a business leased line like a broadband order — expecting it live in days. It is closer to a small construction project. Understanding the leased line installation time, and what moves it, is the difference between a clean cutover and weeks of disruption. This guide walks through the realistic timeline, the steps inside it, and how to stop the avoidable delays.

What Is the Typical Leased Line Installation Time in the UK?

The realistic range is 30–90 working days. Sites with existing fibre reach can connect in 30 working days; new routes requiring road work can take 60–90 days or longer. The variable is rarely the carrier — it is the physical distance between your building and usable fibre.

A leased line is a dedicated fibre connection built specifically to your premises, so part of the timeline is genuine civil engineering. Three site categories drive most of the variation:

Because the line is dedicated rather than shared, it also delivers the consistent symmetric speeds and a 99.99% uptime SLA that ordinary broadband cannot — which is why the wait is usually worth it. If you want the underlying technology explained plainly, read what is a leased line.

Why Do Leased Lines Take So Long to Install?

The installation involves a site survey, wayleave permissions if the fibre route crosses third-party land, civil engineering works to lay ducting, fibre splicing, and equipment commissioning. Each step depends on the one before it, so a single hold-up — a survey finding, a landlord signature — pushes the whole schedule.

Here is the order in which it actually happens:

1. Order and postcode check. The carrier confirms whether your site is on-net (fibre present) or off-net (build required). This determines whether excess construction charges apply. 2. Site survey. An engineer confirms the physical route, entry point, and any obstructions. 3. Planning and wayleaves. If the fibre crosses land you do not own, the landowner must sign a wayleave agreement granting access. 4. Civil works. Ducting is laid, which may need a local authority street-works permit and traffic management. 5. Fibre installation and splicing. The fibre is pulled through and jointed to the network. 6. Commissioning and handover. The router is installed, the circuit is tested, and the service goes live.

The UK fibre picture is improving fast, which shortens step one for more businesses each year. Total FTTP coverage reached roughly 79.5% of UK premises in Q3 2025, and gigabit-capable broadband now covers 87% of the UK, up from 84% in 2024, according to Ofcom's Connected Nations data (Ofcom). Government-backed rollout under Project Gigabit continues to extend reach into harder-to-build areas (gov.uk).

What Can Delay a Leased Line Installation?

Common delays include wayleave disputes with landlords or authorities, underground obstructions discovered during civil works, and survey findings that force a route change. Each of these adds time outside the carrier's direct control, which is why padding your order date matters more than chasing the provider.

The delays we see most often:

• Wayleave hold-ups. A landlord who is slow to sign, or asks for legal review, can add weeks. Start this conversation early if you rent.
• Excess construction charges (ECCs). If the build cost exceeds the standard allowance, the carrier issues a quote you must approve before work proceeds — a common silent pause.
• Street-works permits. Local authority permitting and traffic management for road excavation run on their own timetable.
• Underground surprises. Blocked or collapsed ducting found mid-build means a re-plan.
• Internal readiness. Comms room location, power, and access on the day all need confirming up front.

AMVIA manages each of these proactively rather than reacting once the clock has already slipped. For a full picture of the connection itself, see dedicated internet access and the FTTP leased line option, which can shorten build time where full-fibre infrastructure already passes the premises.

Can I Get a Temporary Connection While Waiting?

Yes. Businesses can run on business-grade broadband or 4G/5G during installation, and AMVIA can provision this so you are never offline waiting for the leased line. UK broadband average download speed is 69.4 Mbps (Ofcom Connected Nations 2024) — adequate for short-term office use while the dedicated line is built.

We set the temporary service up as a stepping stone, then migrate your traffic onto the leased line once it activates. Treating it as planned backup connectivity rather than a panic measure means no downtime on cutover day, and the backup circuit keeps earning its place as resilience afterwards.

How Far Ahead Should You Order a Leased Line?

Order 90 days before you need the line live. That window absorbs the survey, wayleave, and civil-works steps without forcing you into a crisis if any single stage runs long. If you are moving offices or opening a new site, the order should go in the moment the lease is signed.

A realistic planning checklist:

• 90 days out: Place the order, run the postcode check, confirm the contract end date of your current line.
• 60 days out: Chase wayleave sign-off and approve any excess construction charge quote.
• 30 days out: Confirm the install date, comms room readiness, and the temporary connection plan.
• Go-live week: Engineer attends, circuit tested, services migrated, old line retained briefly as fallback.

Leased lines start from £69/mo, and the cost is driven more by bandwidth and build distance than by the wait. For a full breakdown, read the leased line cost guide.

Does a Faster Line Change Your Security Exposure?

Yes — and it is the step most businesses skip. A dedicated line moves more of your business onto the internet, faster, which widens the surface attackers can probe. The connection should be commissioned alongside the controls that protect what runs over it, not bolted on months later.

A leased line is the right moment to review firewalling, segmentation, and monitoring as one design. AMVIA does this as standard: connectivity and security from one accountable provider. See how the two fit together in leased line security. One provider, security-first, Microsoft-certified — so the line that carries your business is also defended properly.