100Mbps Leased Line Costs in the UK
A 100Mbps leased line starts from £69/month in London and major UK cities, rising to £320+ in harder-to-reach areas. This guide breaks down real pricing by region, what pushes the price up or down, and how to get the best deal for your postcode.
Quick answer: what does a 100Mbps leased line cost?
A 100Mbps leased line costs from £69/month in London and major UK cities, with most suburban and rural postcodes ranging up to £320+/month. Installation is typically £500–£2,000 as a one-off, though many carriers waive it on a 36-month term. Your exact price depends on how close your building is to existing fibre — which is why the only reliable figure is a quote for your address.
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100Mbps Leased Line Pricing by Region (2026)
Monthly pricing ranges for a 100Mbps dedicated leased line. The spread within each region reflects distance to the nearest fibre exchange and which carriers reach your building.
| Location | Monthly Cost Range | Notes |
|---|---|---|
| LondonBest value | £69–£234 | Dense fibre coverage keeps pricing competitive |
| Major cities (Manchester, Birmingham, Leeds, Sheffield) | £69–£318 | Multiple carriers compete on most commercial postcodes |
| Suburban areas | £69–£320 | Price depends heavily on distance to existing fibre |
| Rural areas | £69–£320+ | Excess construction charges possible where fibre must be built |
What Drives the Price of a 100Mbps Leased Line
Two businesses on the same tariff can pay very different amounts. These are the six factors that actually move the number.
Location and distance to fibre
The single biggest factor. If fibre already reaches your building, you pay the low end of the range. If the carrier has to dig, costs rise — and rural premises can face excess construction charges of £500–£10,000+.
Contract length
Most carriers require a minimum 36-month term, and many waive the installation charge at that length. Shorter terms mean higher monthly pricing and an install fee of £500–£2,000.
Installation complexity
A straightforward install where fibre reaches the building is often free or low-cost. Wayleaves, listed buildings, and long private driveways all add engineering time and cost.
SLA level
A standard 99.95%–99.99% uptime SLA is included. Enhanced SLAs with faster fault-repair targets typically add 10–15% to the monthly cost.
Carrier choice
BT Openreach, Virgin Media Business, CityFibre and Zayo each have different fibre footprints. The cheapest carrier for your postcode depends on whose network is already closest — which is why a multi-carrier comparison beats a single quote.
Bearer headroom
Ordering 100Mbps on a 1Gbps bearer costs slightly more up front but lets you upgrade speed later with a configuration change instead of a new install — usually worth it for growing teams.
Who is a 100Mbps leased line right for?
A 100Mbps dedicated circuit suits small-to-mid offices of roughly 25–50 staff — teams that have outgrown contended broadband but don't yet need gigabit capacity. Because a leased line is uncontended and symmetric, 100Mbps dedicated performs very differently from "100Mbps" broadband: you get the full speed in both directions at all times, backed by an uptime SLA with service credits.
It's usually the right tier if you run cloud apps (Microsoft 365, CRM, ERP) and VoIP for a modest headcount, upload as much as you download, and can't afford peak-time slowdown. If your team is larger, cloud-heavy, or growing fast, compare against the 1Gbps tier — the price gap is often smaller than expected.
Monthly cost vs one-off costs
The monthly rental (from £69/month in well-served areas) is only part of the picture. Budget for:
- Installation: typically £500–£2,000 as a one-off, frequently waived on a 36-month contract.
- Excess construction charges (ECCs): where fibre has to be physically built to your premises, ECCs can range from £500 to £10,000+. A real multi-carrier check surfaces these before you commit.
- Failover: many businesses pair the circuit with backup connectivity (broadband or 4G/5G) so a single fault never takes them offline.
Why prices vary so much between postcodes
Leased line pricing is engineered per address, not per product. Each carrier prices from where its existing fibre runs relative to your building — so the same 100Mbps circuit can be £69/month on one street and several times that a mile away. Urban postcodes (London, Manchester, Birmingham, Sheffield) generally price lower than rural ones because more carriers compete there. This is why comparing BT Openreach, Virgin Media Business, CityFibre and Zayo for your specific postcode routinely beats accepting a single provider's rate card — see our full UK leased line cost breakdown.
100Mbps leased line vs business broadband
Business broadband is cheaper per month, but it is contended (shared with neighbouring premises), asymmetric (slow uploads), and carries no meaningful fix-time guarantee. A leased line costs more because the SLA is the product: guaranteed speed, symmetric bandwidth, and contractual repair times. If downtime costs you real money, the comparison usually resolves quickly — our leased line vs broadband comparison covers the decision in detail.
How to get the best 100Mbps price
Three moves consistently reduce the price: commit to a 36-month term (install usually waived), order on a 1Gbps bearer for cheap future upgrades, and — most importantly — compare every carrier that reaches your postcode rather than taking the first quote. AMVIA runs that comparison across BT Openreach, Virgin Media Business, CityFibre, Zayo and others, then manages the install end to end. Start with your postcode and a tailored quote typically lands within 24 hours.
100Mbps Leased Line Cost FAQs
A 100Mbps leased line starts from £69 per month in London and major UK cities, with suburban and rural postcodes typically ranging up to £320+ per month. The exact price depends on your address and which carriers have fibre nearby, so an accurate figure always comes from a postcode-level quote.
Installation is typically £500–£2,000 as a one-off charge, but many carriers waive it entirely on a 36-month contract. Where fibre has to be physically built to your premises, excess construction charges can apply — a proper multi-carrier availability check surfaces these before you sign anything.
A 100Mbps dedicated line comfortably supports roughly 25–50 staff using cloud applications and VoIP, because the bandwidth is uncontended and symmetric — you get the full 100Mbps up and down at all times. Larger or cloud-heavy teams should compare the 1Gbps tier, which starts from £129 per month.
A new leased line typically takes 30–90 working days from order to live service, covering the desktop survey, physical site survey, any fibre build, and testing. If you need connectivity sooner, a temporary 4G/5G router can bridge the gap until the circuit goes live.
Because pricing is engineered per address. Each carrier prices from where its existing fibre runs relative to your building, so the same circuit can cost very different amounts on neighbouring streets. Comparing BT Openreach, Virgin Media Business, CityFibre and Zayo for your exact postcode is the only way to find the genuine best price.
Yes — if the circuit is delivered on a 1Gbps bearer. The bearer is the physical capacity of the fibre; your committed speed is what you pay for. Ordering 100Mbps on a 1Gbps bearer means a later upgrade is a configuration change and a price adjustment, not a fresh 30–90 day installation.
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Related Resources
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