What Actually Determines the Cost of a Business Leased Line
Quotes for the same speed at the same postcode can differ by thousands a year, and the reason is almost never the speed. It is the distance to the nearest fibre and whether anyone has to dig.
Request a quoteThe number that moves the price is not the one you asked for
People ask for a price for a 1Gb leased line and are surprised when three suppliers quote three very different figures. The bandwidth is rarely what separates them. A leased line is priced mainly on the cost of physically connecting your building to a fibre network, and that cost depends on how far away the nearest usable fibre is, whether the route to it crosses land that needs permission, and whether a road has to be dug up to get there.
This produces results that look irrational until you know the mechanism. A unit on a business park with fibre already in the ducting can be cheap and quick. A unit half a mile away, on the wrong side of a road or a railway, can cost several times more and take months, for exactly the same service. Two neighbouring buildings genuinely can get very different answers, which is why anyone quoting from a postcode rather than an address is guessing.
The second thing that moves the price is the contract length, because the install cost is usually spread across the term. A three or five year term will show a lower monthly figure than a one year term for the same circuit — not because the service is better value, but because the same civils bill is divided by more months. That is worth understanding before treating a long term as a saving.
What actually drives the number
Distance to fibre
The single biggest factor. Metres matter — a building near an existing route is cheap, one that needs a new run is not.
Whether anyone digs
Excavation, road closures and wayleaves are where an ordinary quote becomes a large one. Existing ducting avoids most of it.
Wayleaves
Permission from landowners the route crosses. Free to ask for, slow to obtain, and occasionally refused outright.
Contract length
Install cost is spread across the term, so a longer term lowers the monthly figure without improving the service.
Bearer vs speed
A 1Gb bearer running at 100Mb costs less than 1Gb of bandwidth and upgrades later without a new install.
Resilience
A second diverse route roughly doubles the line cost. Sometimes essential, frequently sold where 4G failover would do.
Where the money usually goes
- A building already served by fibre — the cheapest and fastest case by a wide margin
- A building near an existing route — moderate cost, weeks rather than months
- A new run under a public road — where quotes jump, and where lead times become months
- A route crossing third-party land — a wayleave, which is the most common cause of a delayed install
- A rural site with no fibre for miles — where the honest answer is often that a leased line is not proportionate
- A second diverse circuit — genuine resilience, roughly double the line cost, and not always necessary
What Actually Determines the Cost of a Business Leased Line — Common Questions
Why do leased line quotes vary so much for the same speed?
Because you are largely paying to connect your building to a fibre network rather than for the bandwidth itself. The distance to the nearest usable fibre, and whether a road or third-party land is in the way, can change the cost several times over for an identical service. Two neighbouring buildings genuinely can get very different quotes.
Is a longer contract actually cheaper?
The monthly figure is lower, because the installation cost is spread over more months. Whether that is cheaper depends on how long you will be in the building and whether prices fall in the meantime. It is worth seeing the one, three and five year figures side by side rather than only the one a supplier leads with.
What is a wayleave and why does it delay things?
Permission from a landowner whose land the fibre route has to cross — a neighbour, a landlord, a council, sometimes a railway. It costs little but takes as long as the other party takes, and it is the most common reason an install that looked like six weeks becomes six months. Ask early whether one is needed.
Do we need a 1Gb line if we only use 100Mb?
Usually not. A 1Gb bearer running at 100Mb costs less than 1Gb of bandwidth and can be increased later with a phone call rather than a new installation. Buying the larger bearer and the smaller speed is generally the sensible middle, because the expensive part is the physical connection.
Is a leased line always the right answer?
No, and we would rather say so. Where a business needs a guaranteed fix time and symmetric speed it earns its cost; where it mostly needs reliability, business fibre with an automatic 4G or 5G failover often achieves the same practical outcome for a fraction of the money. The question is what an hour of downtime actually costs you.
How long does installation take?
Anywhere from a few weeks where fibre is already in the building to several months where civils and wayleaves are involved. The estimate given at quote stage is exactly that until a survey has been done. Where the date matters, a temporary 4G or 5G circuit bridges the gap and is removed when the line lands.
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Want a real number for your address?
We can check what is actually available at the specific building rather than the postcode, and tell you whether a leased line is proportionate — including when it is not, and business fibre with a 4G failover would do the same job for far less.