If your business runs on cloud software, video calls, and VoIP — and your broadband keeps letting you down — a leased line might be the single most impactful infrastructure decision you make this year. This guide cuts through the jargon and tells you exactly what a leased line is, what it costs, and whether your business actually needs one.
The short answer
- A leased line gives your business a dedicated, symmetrical internet connection — no sharing with neighbours, no speed drops at busy times.
- Unlike standard broadband, speeds are guaranteed by an SLA (Service Level Agreement).
- UK pricing typically runs from £200–£600/month depending on speed and location — VoIPninjas offer leased lines from £149/month.
- They work particularly well alongside a VoIP phone system, since call quality depends on consistent, low-latency upload speeds.
- With the 2027 PSTN switch-off approaching, a leased line combined with VoIP is the clean, future-proof alternative to legacy phone infrastructure.
What is a business leased line?
A leased line — sometimes called an Ethernet leased line or dedicated leased line — is a private, point-to-point data connection between your premises and the internet. It is reserved exclusively for your business. Nobody else shares it.
That is the fundamental difference from every other type of broadband you have probably used. Standard business broadband (including fibre) runs on a contended network. Your connection shares capacity with dozens or hundreds of other businesses and households on the same exchange. A leased line is yours alone, 24 hours a day.
The connection is also symmetrical. You get the same upload speed as download speed. For a 500 Mbps leased line, that means 500 Mbps both ways. Most broadband products offer upload speeds a fraction of the download — a serious limitation for businesses that push data out to the cloud, send large files, or host video calls.
Leased lines come with a formal SLA. The provider commits in writing to specific uptime targets (typically 99.9–99.95%), a guaranteed response time if something goes wrong, and compensation if they miss it. That accountability simply does not exist with standard broadband contracts.
Leased line vs. broadband: what’s the actual difference?
The headline specs tell part of the story — but the day-to-day experience is what matters most.
With standard business broadband, speeds vary throughout the day. At 9am and 5pm — when everyone else is online — your throughput drops. Upload speeds are typically five to ten times slower than downloads. Latency spikes. If you are on a video call or processing a cloud backup, you feel it.
A leased line eliminates all of that. Speed is consistent regardless of the time of day or what your neighbours are doing. Latency stays low. Upload matches download. You get the connection you are paying for, every hour of every working day.
There is also a resilience difference worth noting. Many leased line providers (including VoIPninjas) offer diverse routing — physical redundancy built into the connection — whereas broadband failover usually means adding a second broadband line and hoping it holds.
If you want to understand how standard fibre broadband for business works and where it falls short, that guide covers the specifics in detail. For many smaller businesses, fibre broadband is perfectly adequate. But once your team grows beyond around ten people, or your dependence on cloud tools becomes critical, the limitations of a shared connection start costing you time and money.
How much does a leased line cost in the UK?
Leased line pricing in the UK varies based on three main factors: speed, location, and the distance between your premises and the nearest point of presence on the carrier’s network.
Typical market range: £200–£600 per month for most UK business locations, at speeds between 100 Mbps and 1 Gbps.
More remote or rural locations cost more, because the civils work to bring the line to your building is more extensive. Dense city-centre locations tend to be at the lower end of the range because the infrastructure is already close.
At VoIPninjas, leased lines start from £149/month. As a direct provider, we handle the survey, installation coordination, and ongoing support without adding a reseller margin on top. That keeps your monthly cost lower than going through a broker or buying via a larger telecoms bundle.
Installation costs are separate from the monthly rental. Expect to budget £500–£3,000 for the initial installation, depending on how much civils work is required to get the line into your building. For many urban locations, installation is included or heavily subsidised — your survey will confirm this.
One thing worth factoring in: a leased line contract is typically 36 or 60 months. That makes the upfront survey and any installation charges relatively small over the contract lifetime. A £1,500 installation spread over three years adds around £42/month to your effective cost.
Get a no-obligation quote from VoIPninjas and we will survey your premises at no cost, so you know exactly what installation looks like before you commit to anything.
What speeds do businesses actually need?
There is no universal answer, but there is a practical method for working it out.
Start with headcount and usage. As a rough guide:
- 10–25 staff using cloud apps, email, and occasional video calls: 100–200 Mbps is typically sufficient.
- 25–75 staff with heavy cloud reliance, VoIP, and regular video conferencing: 200–500 Mbps.
- 75+ staff or data-intensive industries (media production, large-file transfers, hosted servers): 500 Mbps–1 Gbps.
VoIP calls themselves are surprisingly light on bandwidth — a single HD voice call uses around 100 Kbps. The issue is not volume; it is consistency. A call dropped by a momentary latency spike is just as disruptive as one that never connected. That is why symmetrical, dedicated upload speeds matter far more than raw download speed for businesses running VoIP.
Video conferencing is more demanding. A single 1080p video call uses around 1.5–3 Mbps each way. Ten simultaneous video calls across your team needs 15–30 Mbps of guaranteed upload — something most business broadband products cannot reliably deliver during peak hours.
Cloud backup and file syncing (Microsoft 365, Google Workspace, Dropbox) runs continuously in the background and competes with everything else on a shared connection. On a leased line, it runs in the background without touching your voice or video quality.
Is a leased line right for your business?
A leased line is not the right answer for every business. Here is an honest assessment of who genuinely benefits.
A leased line makes strong commercial sense if:
- You have 10 or more staff who rely on cloud applications (Microsoft 365, Salesforce, Xero) throughout the working day.
- Your business uses VoIP for all or most of its phone calls — call quality is only as good as the upload speed and latency of your connection.
- You operate in healthcare, legal, or financial services — where data compliance, uptime, and security are non-negotiable and where a degraded connection creates real professional risk.
- You run a multi-site operation and need to connect sites reliably with MPLS or SD-WAN overlays.
- Your team conducts frequent video conferences with clients or runs remote-first working arrangements.
- You host on-premise servers, telephony infrastructure, or run any service that external users connect to.
A leased line is probably not necessary if:
- You have fewer than five staff and mainly use email and web browsing.
- Your cloud usage is light and you rarely make video calls.
- You are on a tight budget and decent business broadband is available at your premises.
If you are on the fence, the free survey solves the problem. VoIPninjas will assess your premises, check availability, and give you an honest recommendation — including whether business fibre broadband would serve you just as well.
Leased lines and VoIP: why they work together
VoIP calls travel as data packets across your internet connection. The quality of every call — clarity, latency, whether it drops — is directly determined by the quality of that connection.
On a shared broadband circuit, VoIP quality is unpredictable. Upload speeds fluctuate. Latency spikes when the network is busy. Packet loss — even a fraction of a percent — causes audible glitches and dropouts. Businesses that have struggled with VoIP call quality on broadband often find the problem is not the phone system; it is the connection underneath it.
A leased line removes all of those variables. Your upload speed is guaranteed. Latency is consistent and low. There is no contention with other users. The result is HD-quality voice calls that sound like the person is in the same room — regardless of how many calls are running simultaneously.
This is why pairing a VoIP phone system with a leased line from the same provider makes practical sense. VoIPninjas supply both, which means the connection and the phone system are configured and supported together. No finger-pointing between an internet provider and a separate phone supplier when something goes wrong.
If you are looking at switching to VoIP and want to understand what the full setup looks like for an SME, that guide covers the whole picture. And if you are comparing options for your business phone system, the VoIPninjas plans — Ronin at £5.99/user/month, Samurai at £14.99/user/month, and Shogun at £24.99/user/month — are built to run cleanly on a dedicated connection.
There is one more piece worth mentioning. The PSTN switch-off in 2027 means that all legacy analogue and ISDN lines in the UK will be decommissioned. Businesses still running traditional phone lines will need to migrate to an IP-based alternative. A leased line with VoIP is the cleanest, most future-proof solution — fully independent of the old PSTN infrastructure and ready for whatever comes next.
How VoIPninjas leased lines work
VoIPninjas are a direct provider — not a broker, not a reseller. That matters because it affects both price and the support experience when you need help.
Here is how the process works from your first enquiry:
1. Free site survey. We assess your premises at no cost. We check line availability, distance to our network, and what installation looks like. You get a clear picture before you sign anything.
2. No-tie-in quote. You receive a written quote with a monthly price starting from £149/month, any one-off installation costs clearly itemised, and the contract terms. No hidden fees.
3. Installation. Most installations complete within 30–60 working days, depending on how much civils work is required. We manage the whole process and keep you updated throughout.
4. Guaranteed SLA. Your connection comes with a formal Service Level Agreement covering uptime, response times, and fault resolution. If we miss it, you are compensated.
5. Local support. VoIPninjas are based on the South Coast, and our support team handles your account directly. You are not calling a national call centre and starting from scratch every time.
6. Bundle with VoIP. If you want to run your phone system on the same connection, we set both up together. One provider, one bill, one point of contact.
Get a free leased line quote
We survey your premises at no cost. Most installations complete within 30–60 working days.
Frequently asked questions
What is the difference between a leased line and fibre broadband?
Fibre broadband uses a shared network — the capacity is split between all the businesses and homes connected to the same exchange. A leased line is a dedicated connection used only by your business. Leased lines are symmetrical (same upload and download speed), come with an SLA, and deliver consistent performance regardless of the time of day. Fibre broadband is cheaper but offers no guarantees on speed or uptime.
How long does a leased line installation take in the UK?
Most leased line installations in the UK take between 30 and 60 working days from order confirmation. The exact timeline depends on how much new infrastructure (civil works, new ducting, building entry) is required. Urban locations with existing carrier infrastructure nearby tend to be faster. Your site survey will give you a realistic estimate for your specific premises.
Can I run VoIP on a leased line?
Yes — and it is the ideal setup. A leased line provides the consistent upload speed and low latency that VoIP calls require to sound clear and remain stable. VoIPninjas supply both leased lines and VoIP phone systems, so both can be configured and supported together. Running VoIP over a leased line also means your phone system is completely independent of the old PSTN infrastructure, which BT is switching off in 2027.
Are leased lines affected by the 2027 PSTN switch-off?
No. Leased lines carry data over an IP network and have nothing to do with the analogue PSTN. When BT switches off the old copper telephone network in 2027, businesses still running ISDN or traditional analogue lines will need to migrate. Businesses already on a leased line with VoIP are fully insulated from the switch-off — the infrastructure they use is already PSTN-independent.
Do leased lines have usage limits or data caps?
No. Leased lines are unmetered — there are no data caps, fair-use policies, or traffic-shaping rules. You pay for a fixed speed and you get that speed, for as much data as you need to transfer, around the clock. This makes them particularly well-suited to businesses with high and consistent data usage such as cloud backups, large file transfers, or continuous video conferencing.